Radio Galaxy Zoo Talk

Test thread (the title of which I can edit)

  • JeanTate by JeanTate

    JT's test thread, in which I get to try stuff out ...

    Q1h5:

    enter image description here

    {weak nuclear, v. weak dl; probably artifact}

    Q1gg:

    enter image description here

    {clear nuc; noise elsewhere}

    Q16q:



    {~noise everywhere}

    Q0yv:



    {2 indep nucs, noise; interesting quenched gal!}

    Q1lh:



    {noise; v faint dl?}

    Q0e2:



    {noise}

    Q1lo:



    {2 unrelated nuclear sources}

    Q174:



    {nuc, noise; NVSS shows + sources?}

    Q2ay:



    {nuc, noise}

    Q17l:



    {2 unrelated nuclear sources}

    Posted

  • JeanTate by JeanTate

    32j0, DSS2 "Luptonized" (B/B, R/G, IR/R):

    enter image description here

    SDSS (same center, scale):

    enter image description here

    WISE (3.4/B, 4.6/G, 12/R):

    enter image description here

    From RADIO CONTOUR EXPLOSION:

    enter image description here

    Notes:

    • I doubt the DSS2 data is flux; more likely (scanned) digitized density, so is some plate emulsion dependent non-linear function of flux (UPDATE: see below)
    • which means that F = asinh (x/β) is not particularly good
    • I = (r+g+b)/3, with rather coarse/crude clipping, for both DSS and WISE
    • the sky is simply the field median, in all six cases
    • the bi-modal colors of the WISE image suggests that another measure of I might be better
    • the host - a QSO - is blue in both DSS and SDSS, but red (and bright!) in WISE! 😮
    • the other bright red WISE source is a low-z inclined spiral galaxy; it's blue in DSS because of the stars, and red in WISE because of the dust (and cold gas?)

    UPDATE (19 August, 2014): the SkyView DSS2 FITS headers state "Pixel values are given as scaled densities"

    Posted

  • JeanTate by JeanTate in response to JeanTate's comment.

    After some editing, tweaking, etc of my code (WISE contours are band 1):

    enter image description here

    enter image description here

    enter image description here

    enter image description here

    etc.

    {Boilerplate}

    Posted

  • JeanTate by JeanTate

    15jc, z_sp 0.453 SDSS J100457.45+400556.0 DONE

    <enter image description here>

    0rn8, z_sp 0.096 SDSS J135152.97+465026.2 DONE

    <enter image description here>

    36bv ? DONE; need 2nd go? (unlikely)

    <enter image description here>

    2hem, z_sp 0.300 SDSS J083512.43+175441.0 DONE

    <enter image description here>

    WaW 0dll, z_ph 0.56 SDSS J143631.89+541524.2 DONE

    <enter image description here>

    3nwu, z_ph 0.12 SDSS J015744.20+024044.9 DONE; need 2nd go? (unlikely)

    <enter image description here>

    1c36 ? DONE; need 2nd go? no

    <enter image description here>

    08cq ? DONE; need 2nd go? (unlikely)

    <enter image description here>

    2g9c, z_ph 0.35 SDSS J135837.03+182504.9 DONE

    <enter image description here>

    1dhe, z_sp 0.205 SDSS J081235.97+360145.4 DONE

    <enter image description here>

    1u5v, z_ph 0.31 SDSS J104459.45+280459.1 DONE

    <enter image description here>

    29sx, z_sp 0.515 SDSS J165208.45+212526.2 DONE

    <enter image description here>

    0o8d, z_ph 0.4 SDSS J154814.62+483502.0 DONE

    <enter image description here>

    1n55, z_ph 0.25 SDSS J094103.62+312618.7 DONE

    <enter image description here>

    13o3, z_sp 0.110 SDSS J131143.08+405859.7, 2MASX J13114312+4058596 DONE

    <enter image description here>

    087m, z_ph 0.33 SDSS J105426.23+573649.1 DONE

    <enter image description here>

    2g36, z_sp 0.232 SDSS J161627.36+182924.0 DONE

    <enter image description here>

    3ayt, z_sp 0.030 SDSS J150700.55+071316.5 DONE

    <enter image description here>

    3afk, z_sp 0.313 SDSS J144733.14+072451.4 DONE

    <enter image description here>

    1xvf, z_sp 0.038 SDSS J142042.91+262503.2, extended in NVSS? DONE

    <enter image description here>

    3pjj, z_sp 0.158 SDSS J110845.48+020240.8 DONE

    <enter image description here>

    3fuz, z_ph 0.108 SDSS J204338.33+053134.8 DONE

    <enter image description here>

    3k0q, z_ph 0.18 SDSS J231635.19+040518.3 DONE

    <enter image description here>

    33ay, SDSS J111049.36+095307.1 DONE

    <enter image description here>

    3mtv, z_ph 0.22 SDSS J234513.69+030508.8 DONE

    <enter image description here>

    2hl6, SDSS J154209.91+174948.9 DONE

    <enter image description here>

    20pk DONE

    <enter image description here>

    2esi, SDSS J080601.51+190614.7 DONE

    <enter image description here>

    2vai, SDSS J143948.32+121745.4 DONE

    <enter image description here>

    3a3y, SDSS J155203.47+073141.9 DONE

    <enter image description here>

    360p, DONE

    <enter image description here>

    244x, DONE

    <enter image description here>

    3mns, DONE

    <enter image description here>

    11io, 2MASX J13332182+4208445 DONE

    <enter image description here>

    1x80 DONE

    <enter image description here>

    0gx5 ? DONE once; do zoomed-in DONE

    <enter image description here>

    3284, z_sp 0.507 SDSS J222552.80+101316.7 re-do, zoomed in, lower NVSS threshold DONE

    <enter image description here>

    2h1x, DONE

    <enter image description here>

    05mb, SDSS J132931.31+592940.5 DONE

    <enter image description here>

    2rea, SDSS J103419.92+134512.3 <enter image description here>

    2rea 72 <enter image description here>

    2rea 90 <enter image description here>

    Posted

  • JeanTate by JeanTate

    Pieces of further automating and streamlining 'doublelobe spiral' (and other interesting) overlays*

    07fk <enter image description here>

    07fk 54 <enter image description here>

    0fyb <enter image description here>

    0fyb 54 <enter image description here>

    2esa <enter image description here>

    2g0s (labelled "b") <enter image description here>

    3jjg <enter image description here>

    2da3 36 <enter image description here>

    36hs 54 <enter image description here>

    1182 36 <enter image description here>

    21nf 54 <enter image description here>

    26v8 24 <enter image description here>

    36bv <enter image description here>

    0d99 24 <enter image description here>

    0d99 30 <enter image description here>

    32pb <enter image description here>

    GZRS063 <enter image description here>

    GZRS082 <enter image description here>

    276c 36 <enter image description here>

    0gx5 <enter image description here>

    318m 24 <enter image description here>

    1vko <enter image description here>

    27yg <enter image description here>

    2da8 <enter image description here>

    1cfs 54 <enter image description here>

    1cfs 72 <enter image description here>

    1cfs 120 <enter image description here>

    1cfs <enter image description here>
    1cfsb 54 <enter image description here>

    3o6c 54 <enter image description here>

    3o6c 36 <enter image description here>

    *basically FIRST and/or NVSS contours on SDSS images

    Posted

  • JeanTate by JeanTate

    29si <enter image description here>

    2yx8 <enter image description here>

    2lm2 24 <enter image description here>

    0uda 24 <enter image description here>

    01ju <enter image description here>

    2328 <enter image description here>

    0xud 36 <enter image description here>

    38ga <enter image description here>

    1g1q <enter image description here>

    3l57 24 <enter image description here>

    1iex 36 <enter image description here>

    205t <enter image description here>

    12p4 <enter image description here>

    3fax <enter image description here>

    1zgu <enter image description here>

    1zhx 24 <enter image description here>

    1r7v 36 <enter image description here>

    0j2i 24 <enter image description here>

    0z26 24 <enter image description here>

    3567 <enter image description here>

    0v85 <enter image description here>

    0498 54 <enter image description here>

    72 <enter image description here>

    90 <enter image description here>

    120 <enter image description here>

    3abf 90 <enter image description here>

    Posted

  • JeanTate by JeanTate

    2ako <enter image description here>

    3eq2 <enter image description here>

    0t2i 24 <enter image description here>

    24od 54 <enter image description here>

    0rvo <enter image description here>

    0anx 24 <enter image description here>

    14oh <enter image description here>

    114d 54 <enter image description here>

    72 <enter image description here>

    3jpi 54 <enter image description here>

    72 <enter image description here>

    3nuv 24 <enter image description here>

    54 <enter image description here>

    3gu2 24 <enter image description here>

    0xhv <enter image description here>

    x001 72 <enter image description here>

    GZRS082 72 <enter image description here>

    Posted

  • JeanTate by JeanTate

    Can you see me? (using G+ as 'cloud' photo storage)

    enter image description here

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to JeanTate's comment.

    Yes, try dropbox also

    Posted

  • JeanTate by JeanTate in response to Dolorous Edd's comment.

    Thanks!

    I'd been using Photobucket, but after my browser got one too many adware infections, decided to look elsewhere. So far, Google/Picasa (now part of Google+) seems to work well, and I don't need to set up yet another account to manage. However, Picasa apparently - by default - 'enhances' photos; the image files I upload are all JPEGs (so far, anyway) - so the data is already, um, compromised - but I'm afraid the 'enhancement' may make astronomical images look worse (and I'm not sure I can disable 'enhancement' so that it never happens).

    Have you used Dropbox? If so, are you happy with how it works (for 'cloud storing' RGZ images, to be posted into Talk posts)?

    Posted

  • JeanTate by JeanTate

    114d(b) 72 <enter image description here>

    120 <enter image description here>

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to JeanTate's comment.

    Have you used Dropbox? If so, are you happy with how it works (for 'cloud storing' RGZ images, to be posted into Talk posts)?

    Yes I do, all images I post are linked to Dropbox, didn't experience any troubles with it

    It was just FYI, so use whatever you like ( in the end they are all the same )

    I'm not sure I can disable 'enhancement'

    You can

    Posted

  • JeanTate by JeanTate in response to Dolorous Edd's comment.

    Thanks again.

    I was also able to disable 'awesome', which produced a looping 'video' (probably an animated GIF, or similar) of some of my contour overlay images; the only 'awesome' thing about it was just how awesomely horrible it was! 😉

    I've used Google+/Picasa for several of the contour overlay images I've posted here; so far seems to have worked OK. I'll keep Dropbox in mind, in case I run out of space, or need a backup.

    Posted

  • JeanTate by JeanTate in response to Dolorous Edd's comment.

    3k9d 180 <enter image description here>

    240 <enter image description here>

    0l1t <enter image description here>

    2o5i 24 <enter image description here>

    1mml <enter image description here>

    0ve1 24 <enter image description here>

    1idj <enter image description here>

    3mbk 24 <enter image description here>

    e020 <enter image description here>

    03xq 30 <enter image description here>

    e015 <enter image description here>

    e016 <enter image description here>

    e027 90 <enter image description here>

    e020b <54 enter image description here>

    2rea 180 <enter image description here>

    3284 90 <enter image description here>

    22jc 240 <enter image description here>

    2h1x 54 <enter image description here>

    e030 36 <enter image description here>

    Posted

  • JeanTate by JeanTate

    SDRAGN candidates with z_sp. Numbers after thumbnail are z_sp, fracDeV_r, c(r), ellipticity (r), and petroRad_r

    <enter image description here 0.06 0.23 0.387 0 4.2
    enter image description here 0.11 0.67 0.343 0 6.2
    enter image description here 0.158 1.00 0.395 0 7.6
    enter image description here 0.211 1.00 0.400 0 1.7
    enter image description here 0.405 0.87 0.342 0 4.5
    enter image description here 0.098 0.60 0.338 1 5.5
    enter image description here 0.189 1.00 0.315 1 7.5
    enter image description here 0.313 1.00 0.338 1 3.0
    enter image description here 0.507 1.00 0.394 1 4.4
    enter image description here 0.047 0.06 0.427 2 4.3
    enter image description here 0.118 1.00 0.315 2 11.4
    enter image description here 0.14 0.93 0.337 2 13.7
    enter image description here 0.162 1.00 0.339 2 3.2
    enter image description here 0.205 1.00 0.313 2 4.8
    enter image description here 0.221 0.92 0.361 2 3.7
    enter image description here 0.285 0.76 0.351 2 6.4
    enter image description here 0.312 1.00 0.303 2 2.6
    enter image description here 0.351 1.00 0.386 2 4.9
    enter image description here 0.515 1.00 0.347 2 3.4
    enter image description here 0.035 0.58 0.360 3 20.4
    enter image description here 0.038 1.00 0.311 3 9.3
    enter image description here 0.145 0.65 0.396 3 7.0
    enter image description here 0.146 0.91 0.360 3 4.1
    enter image description here 0.172 1.00 0.330 3 3.7
    enter image description here 0.203 1.00 0.340 3 3.5
    enter image description here 0.307 1.00 0.300 3 9.7
    enter image description here 0.499 0.39 0.492 3 5.8
    enter image description here 0.096 1.00 0.338 4 5.1
    enter image description here 0.176 1.00 0.327 4 2.6
    enter image description here 0.198 0.53 0.455 4 2.5
    enter image description here 0.209 1.00 0.310 4 4.4
    enter image description here 0.512 0.70 0.385 4 3.7
    enter image description here 0.559 0.00 0.482 4 4.1
    enter image description here 0.149 0.31 0.405 5 4.1
    enter image description here 0.238 0.85 0.403 5 3.9
    enter image description here 0.275 0.21 0.399 5 4.0
    enter image description here 0.453 0.99 0.397 5 3.6
    enter image description here 0.032 0.36 0.392 6 15.3
    enter image description here 0.044 0.17 0.395 6 8.9
    enter image description here 0.154 0.78 0.364 6 3.5
    enter image description here 0.033 0.00 0.405 7 8.9
    enter image description here 0.049 0.06 0.415 7 10.4
    enter image description here 0.057 0.78 0.329 7 8.5
    enter image description here 0.316 0.98 0.342 7 4.0

    Posted

  • JeanTate by JeanTate

    SDRAGN candidates with z_ph. Numbers after thumbnail are z_ph, fracDeV_r, c(r), ellipticity (r), and petroRad_r

    <enter image description here 0.1 0.33 0.416 3 3.4
    enter image description here 0.1 0.20 0.410 5 4.2
    enter image description here 0.105 0.00 0.450 6 2.4
    enter image description here 0.108 0.38 0.457 7 2.9
    enter image description here 0.11 1.00 0.367 5 4.2
    enter image description here 0.12 0.35 0.394 7 3.4
    enter image description here 0.125 1.00 0.363 1 6.6
    enter image description here 0.13 0.26 0.336 6 3.2
    enter image description here 0.134 0.00 0.532 0 5.3
    enter image description here 0.16 0.41 0.460 1 5.9
    enter image description here 0.16 0.76 0.346 7 5.6
    enter image description here 0.16 0.76 0.459 6 2.2
    enter image description here 0.165 0.09 0.405 9 2.6
    enter image description here 0.165 0.91 0.361 7 2.5
    enter image description here 0.17 0.60 0.519 2 3.0
    enter image description here 0.18 1.00 0.359 1 2.7
    enter image description here 0.19 0.59 0.375 1 3.4
    enter image description here 0.2 0.00 0.538 6 2.9
    enter image description here 0.2 0.93 0.383 1 3.1
    enter image description here 0.21 0.78 0.422 4 2.4
    enter image description here 0.23 1.00 0.334 4 4.1
    enter image description here 0.237 0.37 0.457 7 4.2
    enter image description here 0.24 0.00 0.498 9 3.4
    enter image description here 0.25 0.21 0.394 7 4.2
    enter image description here 0.256 0.76 0.318 4 4.5
    enter image description here 0.26 0.30 0.398 2 4.9
    enter image description here 0.26 1.00 0.432 4 3.3
    enter image description here 0.28 0.24 0.388 4 3.7
    enter image description here 0.28 0.34 0.471 4 7.4
    enter image description here 0.28 0.15 0.388 3 4.1
    enter image description here 0.285 0.13 0.432 8 1.9
    enter image description here 0.29 0.16 0.514 3 5.2
    enter image description here 0.33 0.06 0.498 5 6.2
    enter image description here 0.33 0.25 0.428 6 2.3
    enter image description here 0.33 1.00 0.394 4 8.2
    enter image description here 0.34 0.72 0.354 0 3.4
    enter image description here 0.345 0.00 0.597 4 2.7
    enter image description here 0.35 0.00 0.574 3 1.5
    enter image description here 0.358 0.99 0.367 5 5.0
    enter image description here 0.39 0.81 0.360 3 5.8
    enter image description here 0.4 1.00 0.329 5 4.2
    enter image description here 0.42 0.64 0.367 2 3.7
    enter image description here 0.439 0.20 0.405 7 3.7
    enter image description here 0.45 0.00 0.499 8 2.3
    enter image description here 0.465 0.17 0.379 5 6.4
    enter image description here 0.61 1.00 0.311 0 1.8
    enter image description here 0.63 0.44 0.392 6 18.0

    Posted

  • JeanTate by JeanTate

    "obvious AGN?" The 33:

    <enter image description here 0.285 0.76 0.351 2 6.4
    enter image description here 0.221 0.92 0.361 2 3.7
    enter image description here 0.096 1.00 0.338 4 5.1
    enter image description here 0.312 1.00 0.303 2 2.6
    enter image description here 0.39 0.81 0.360 3 5.8
    enter image description here 0.14 0.93 0.337 2 13.7
    enter image description here 0.203 1.00 0.340 3 3.5
    enter image description here 0.11 0.67 0.343 0 6.2
    enter image description here 0.23 1.00 0.334 4 4.1
    enter image description here 0.205 1.00 0.313 2 4.8
    enter image description here 0.405 0.87 0.342 0 4.5
    enter image description here 0.125 1.00 0.363 1 6.6
    enter image description here 0.61 1.00 0.311 0 1.8
    enter image description here 0.2 0.93 0.383 1 3.1
    enter image description here 0.038 1.00 0.311 3 9.3
    enter image description here 0.19 0.59 0.375 1 3.4
    enter image description here 0.42 0.64 0.367 2 3.7
    enter image description here 0.256 0.76 0.318 4 4.5
    enter image description here 0.035 0.58 0.360 3 20.4
    enter image description here 0.176 1.00 0.327 4 2.6
    enter image description here 0.118 1.00 0.315 2 11.4
    enter image description here 0.307 1.00 0.300 3 9.7
    enter image description here 0.515 1.00 0.347 2 3.4
    enter image description here 0.098 0.60 0.338 1 5.5
    enter image description here 0.146 0.91 0.360 3 4.1
    enter image description here 0.172 1.00 0.330 3 3.7
    enter image description here 0.34 0.72 0.354 0 3.4
    enter image description here 0.512 0.70 0.385 4 3.7
    enter image description here 0.313 1.00 0.338 1 3.0
    enter image description here 0.189 1.00 0.315 1 7.5
    enter image description here 0.18 1.00 0.359 1 2.7
    enter image description here 0.209 1.00 0.310 4 4.4
    enter image description here 0.162 1.00 0.339 2 3.2>

    The extra 10; e+g:

    <enter image description here 0.198 0.53 0.455 4 2.5
    enter image description here 0.351 1.00 0.386 2 4.9
    enter image description here 0.211 1.00 0.400 0 1.7
    enter image description here 0.507 1.00 0.394 1 4.4
    enter image description here 0.145 0.65 0.396 3 7.0
    enter image description here 0.158 1.00 0.395 0 7.6>

    fair:

    <enter image description here 0.33 1.00 0.394 4 8.2
    enter image description here 0.26 1.00 0.432 4 3.3
    enter image description here 0.21 0.78 0.422 4 2.4
    enter image description here 0.17 0.60 0.519 2 3.0

    Posted

  • JeanTate by JeanTate

    some sanity checks

    e033 <enter image description here>

    e034 <enter image description here>

    and some extras

    1o9k <enter image description here>

    1tqe <enter image description here>

    35wv <enter image description here>

    e039 90 <enter image description here>

    Posted

  • JeanTate by JeanTate

    check this out

    e044 36 <enter image description here>

    e045 x004 36 <enter image description here>

    e045 <enter image description here>

    e047 36 <enter image description here>

    e048 <enter image description here>

    e049 <enter image description here>

    554365 1214 enter image description here
    655620 407 enter image description here

    581641 367 enter image description here
    173420 299 enter image description here

    651554 281 enter image description here
    555930 134 enter image description here

    656675 125 enter image description here
    654810 96 enter image description here

    587501 89 enter image description here
    587541 86 enter image description here

    652327 80 enter image description here
    180577 73 enter image description here

    176072 70 enter image description here
    177265 62 enter image description here

    581654 62 enter image description here
    182902 57 enter image description here

    572636 56 enter image description here
    553260 53 enter image description here

    555952 52 enter image description here
    583788 51 enter image description here

    582738 50 enter image description here
    570189 43 enter image description here

    654808 224 enter image description here
    181871 61N enter image description here

    Posted

  • JeanTate by JeanTate

    212 <enter image description here>
    213 <enter image description here>
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    218 <enter image description here>

    221 <enter image description here>
    253 <enter image description here>
    e092 <enter image description here>
    e093 <enter image description here>
    253b <enter image description here>

    Posted

  • JeanTate by JeanTate

    3l57 <enter image description here>

    Generic boilerplate: Background image is SDSS per http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx. FIRST (red) contours are derived from FITS files produced using SkyView with Python code described in this RGZ Talk thread. Physical scale bar (cyan) represents projected distance at redshift (lime), assuming a ΛCDM cosmological model with parameter values of ΩM 0.27, ΩΛ 0.73, and H0 71 kms-1Mpc-1. The image center (J2000.0) is the SDSS galaxy [); z_sp (z_ph) its spectroscopic (photometric) redshift.

    Posted

  • JeanTate by JeanTate

    0.021-0.035

    enter image description here 120 enter image description here
    <218 enter image description here
    219 enter image description here
    166 enter image description here
    151 enter image description here
    231 enter image description here
    098 enter image description here
    200 enter image description here
    047 enter image description here
    196 enter image description here>

    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.038-0.070

    146 enter image description here enter image description here

    204 enter image description here enter image description here

    213 enter image description here enter image description here

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.070-0.100

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.100-0.130

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.131-0.170

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.182-0.200

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.200-0.220

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.220-0.237

    033 enter image description here enter image description here

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.238-0.270

    104 enter image description here enter image description here

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the images are {X}.

    Posted

  • JeanTate by JeanTate

    0.270-0.290

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the image are {X}.

    Posted

  • JeanTate by JeanTate

    0.290-0.322

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    The image(s) in this post was (were) created from sources, and using methods, described in this RGZ Talk post. The objects at the center of the image are {X}.

    Posted

  • JeanTate by JeanTate

    OP:

    This post: Brief outline

    Second post: Brief description of what's in the contour overlay images

    Third post: How I produced the contour overlay images

    Fourth post: What this thread's about

    This OP is brief, because once posted, I cannot subsequently edit it (apparently)

    New one line boilerplate (to be put at the end of all posts containing contour overlay images):

    The image(s) in this post were created from sources, and methods, described in this RGZ Talk post [link to the OP of the 'About Contour Overlay Images' thread]. The object at the center of the image is [link to SDSS Explore webpage; not sure what to do about objects which are not SDSS ones. This short sentence is omitted if there is no object at the center.]

    Brief description of what's in the contour overlay images (i.e. the second post of the new thread).

    The background image is:

    The details of how "Luptonized" images were created are in the next post.

    The color contours are derived from FITS files produces using SkyView with Python code described in the next post.

    Unless otherwise noted, the color of the contours indicates the source:

    • red: FIRST
    • cyan: NVSS
    • lime: WISE, 3.4μ band
    • yellow: VLSSr

    RA and Dec coordinates are J2000.0.

    z_sp (z_ph) is the spectroscopic (photometric) redshift of the object in the center of the image, per SDSS (or other source, as noted). If the image is not centered on an object, or if there is no reliable redshift of a centered object, the text "z_ph N/A" is used.

    If there is a physical scale bar, in cyan, it represents (to the nearest kpc) projected distance at a redshift of z_sp/z_ph (in lime), assuming a ΛCDM cosmological model with parameter values of ΩM 0.27, ΩΛ 0.73, and H0 71 kms-1Mpc-1.

    How I produced the contour overlay images (i.e. third post in the new thread) - WIP (needs more work)

    Contours produced from FITS files.

    FITS header: RA, Dec, size (pixels), scale, orientation. Used to produce text (scale bar, orientation vectors) overlaid on image.

    Redshift - spectroscopic, photometric, or "N/A" - an independent input.

    'Zero', a.k.a. 'sky', defined as the median flux.

    Noise is modeled using the MAD (median absolute deviation) statistic, with the 'noise floor' being an input (number of sigmas).

    Smoothing is Gaussian, using an input smoothing parameter (ndimage.gaussian_filter the Python scipy submodule)

    Contour scale factor is also input; common values are √2 and √3.

    More details - including how I came to develop this Python code - are in this RGZ Talk thread.

    "Luptonized" images

    To "Luptonize" is to produce an RGB JPEG colorized using the method described in Lupton+ 2004, "Preparing Red-Green-Blue Images from CCD Data" (arXiv preprint here).

    The three WISE bands I use are:

    • 3.4μ mapped to B,
    • 4.6μ mapped to G, and
    • 12μ mapped to R

    And the three DSS2 are:

    • B mapped to B,
    • R mapped to G, and
    • IR mapped to R.

    I use one of two methods for defining I ("intensity", some sort of measure of total flux, combining all three bands):

    • (by far the most common method) take the DN (WISE)/[?] (DSS2) values in the FITS files downloaded from SkyView
    • (a method I use rarely) normalize so that the max value in each band is the same (after removing the sky, and whatever 'noise floor' above the sky).

    The Python code I wrote, to produce the Luptonized images, is similar to that described above; in particular, the 'sky' is the median, and the 'noise floor' sigma (calculated using the MAD statistic) multiplied by a small number (typically between 1.0 and 3.5).

    For f(I) I use asinh, log, or linear.

    Here are two Luptonized images of the above field, produced using these two methods (same f(I) - asinh - same m and M, same β, etc), respectively:

    enter image description here

    enter image description here

    This post: What this thread's about ...

    I have posted many 'contour overlay images' here in RGZ Talk, for example (source):

    enter image description here

    Most, if not all, posts which contain such images also contain a 'boilerplate' slab of text, at the bottom of the post; these boilerplates are a few words about the piece of sky in the image, the parts of the electromagnetic spectrum they portray, the identity of the cental object, its redshift, the source of the data used to produce the image, and so on.

    Rather than an increasingly large chunk of text, and a growing one too (as I add features, the generic boilerplate grows too), I plan to have a really simple footnote. To the effect of "click here for details of image, including an explanation of what's in it and how it was created". This thread - specifically the first post in it - will be is that "here". 😃

    As my contour overlay images become more diverse (shall we say), I'll edit the posts in this thread.

    Oh, and the thread FIRST and/or NVSS contours on SDSS images contains lists of the images I've posted (and some posted by others too), with links. Despite its title, included are overlays with other than FIRST and/or NVSS contours; and on images other than SDSS ... 😉

    Posted

  • JeanTate by JeanTate in response to JeanTate's comment.

    Now here's a surprise! 😮

    The post (above) which I just posted, I now cannot edit!! 😮 😮

    (apparently)

    UPDATE: Or not; I can now edit it. Why the wait?

    However, I STILL cannot edit the OP of the thread I created October 23 2014 12:00 PM (I won't link to it, because I intend to delete - "Remove" in Talk-speak - it later)

    Posted

  • JeanTate by JeanTate

    1fbj 90 <enter image description here>

    1wdx 108 <enter image description here>

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    x006 72 <enter image description here>

    Posted

  • JeanTate by JeanTate

    1xvf 123 1 <enter image description here>
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    16al 123 7 <enter image description here>

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    2dx9 123 21 <enter image description here>

    Posted

  • JeanTate by JeanTate

    303 36 <enter image description here>

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    o002 500 <enter image description here>

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    Posted

  • JeanTate by JeanTate

    286 18 <enter image description here>

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    Posted

  • JeanTate by JeanTate

    Waw:

    w001 3jyp 18 <enter image description here>

    w003 2y1m 18 <enter image description here>

    w005 1qy6 36 <enter image description here>

    w006 2zog 18 <enter image description here>

    Posted

  • JeanTate by JeanTate

    GZf:

    e119 <36 enter image description here>

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    Posted

  • JeanTate by JeanTate

    S'nT

    328 <enter image description here>

    e153 24 <enter image description here>

    e154 54 <enter image description here>

    e155 <enter image description here>

    330 <enter image description here>

    e117_b 18 <enter image description here>

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    e117_d 18 <enter image description here>

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    Posted

  • JeanTate by JeanTate

    QbyR

    q001 <enter image description here>

    K254 120 <enter image description here>

    Q785b <enter image description here>

    e184 <enter image description here>

    e185 <enter image description here>

    SDA0236 <enter image description here>

    enter image description here
    enter image description here

    <enter image description here>

    <enter image description here>

    <enter image description here>

    The images in this post was created from sources, and using methods, described in this RGZ Talk post. The object at the center of the image is SDSS J081525.77+372025.8.

    Posted