Radio Galaxy Zoo Talk

New Extended Radio Sources From the NVSS (Amirkhanyan+ 2015)

  • JeanTate by JeanTate

    Hot off the arXiv press: "New Extended Radio Sources From the NVSS" by V.R. Amirkhanyan, V.L. Afanasiev, and A.V. Moiseev (arXiv:1502.03660):

    We report the results of the spectroscopic observations carried out at the SAO RAS 6-m telescope for the optical components of nine new extended radio sources found in the NVSS catalog. The measured redshifts of the host galaxies are in the range of z=0.1-0.4. The physical sizes of radio sources were calculated within the standard cosmological model. The two most extended objects, 0003+1512 and 0422+0351 reach the sizes of 2.1 Mpc and 4.0 Mpc, respectively. This is close to the maximum size of known radio sources.

    Oldbie zooites may recognize A.V. Moiseev from his 2011 paper, A new catalogue of polar-ring galaxies selected from the SDSS, which was covered in the GZ forum (e.g. Kinematically Confirmed Polar Ring Galaxies)

    I wonder how many of these nine new extended NVSS radio sources can be found in the Interesting things from NVSS survey thread (or any other, here in RGZ Talk)? 😃

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

    I wonder how many of these nine new extended NVSS radio sources can be found in the Interesting things from NVSS survey thread (or any other, here in RGZ Talk)?

    At least one can be immediately recognized

    For 0003+1512

    See this

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  • ivywong by ivywong scientist, admin

    Good catch. There are a few teams committed to the search for giant radio galaxies and the RGZtalk team has found quite a few good ones !

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

    Well, this part I can now answer:

    I wonder how many of these nine new extended NVSS radio sources can be found in the Interesting things from NVSS survey thread

    None. But as to

    (or any other, here in RGZ Talk)?

    Well, as Dolorous Edd has pointed out, at least one.

    It's interesting that the question of finding an object (or position) within Talk is essentially impossible (short of a brute force, manual read of every post), but there's some hope of finding an ARG field which contains a position ... so I'll have a look and see if any of the other eight giants Amirkhanyan+ report are 'here'.

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  • Dolorous_Edd by Dolorous_Edd

    It's interesting that the question of finding an object (or position) within Talk is essentially impossible (short of a brute force, manual read of every post), but there's some hope of finding an ARG field which contains a position ... so I'll have a look and see if any of the other eight giants Amirkhanyan+ report are 'here'.

    AFAIK only 0003+0351 and 0422+1512 are giants, other objects from this paper are not giants since they don't reach 1Mpc

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  • ivywong by ivywong scientist, admin

    One of the main difficulties in finding Giants is the procurement of reliable redshifts/distances. So RGZ or NVSS alone will be insufficient ... Hope this helps.

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  • DZM by DZM Zooniverse Team in response to JeanTate's comment.

    It's interesting that the question of finding an object (or position) within Talk is essentially impossible (short of a brute force, manual read of every post)

    Hopefully this will be fixed with full-text search, although, since you brought it up, can you think of any other way in which we can improve the ability for someone to find specific objects, other than trusting zooites to hashtag as many objects as possible?

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

    can you think of any other way in which we can improve the ability for someone to find specific objects, other than trusting zooites to hashtag as many objects as possible?

    Sure ... though this suggestion applies, strictly speaking, to only RGZ and GZ (perhaps some other astronomy Zooniverse projects too):

    • given a position (RA, Dec), return the field(s) - ARG's in RGZ's case - which contain it. This is a version of 'position searching', already a suggestion in the various 'how to improve Talk' threads*

    • as many/most (extra-galactic) objects have IDs which encode their position (to some level)^, and as zooites frequently post such IDs even when they do not mention a field (ARG or not), it should be pretty straight-forward for the Developers to create a spider which scans all Discussion posts and Comments, collects all such IDs, and creates what is, in effect, an RGZ Talk catalog ... which can be queried by position match

    • something similar could be used to scoop up other IDs, such as NGC 602

    *The ARG IDs already contain a pretty good indicator of RA: translate the last four characters to an integer, and you'll find it correlates very well with the RA of the field! However, the mapping is ... complicated

    ^examples: 2MASX J02351268+1011467, SDSS J151131.38+071507.0, 080728.58+280122 (it's in the title of a Discussion thread!), PKS 1413+135

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