ARG0000dda A MYSTERY LARGE BLUE OBJECT & A GREEN ERUPTIVE VARIABLE STAR?
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1001G
A mystery blue no photometric object & no objects found with spectra & radio contour. What is it?
a nice green? EV* N5457 V0001 -- Eruptive variable Star SDSS J140425.76+542532.0.
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ivywong
scientist, admin
Wow. What a find! Well if you zoom out a few times in the SDSS images, you'll see that the bright blue spot is a part of the outer arms of a nearby galaxy. While it is possible that the radio emission is coming from a background host behind the blue star-forming region, I am quite sure that the blue blob itself belongs at a similar redshift to the large nearby galaxy since the WISE survey show the region to be strongly emitting in all 4 WISE bands.
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ivywong
scientist, admin
In case you'd like to read more: http://arxiv.org/abs/1102.2439
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c_cld
ARG0000dda Given link http://skyserver.sdss3.org/public/en/tools/chart/navi.aspx?ra=211.12245833333333&dec=54.39641666666667&scale=0.2
and changing to DR7 gives
587735695913386089 [CCJ2005] #NGC 5471 12 -- Cluster of Stars
and lots of other photometric neighbors:
objId ra dec distance type
587735695913386090 211.12148 54.39621 0.049 GALAXY 1
587735695913386091 211.12035 54.39695 0.090 GALAXY 1
587735695913386094 211.12112 54.39511 0.101 GALAXY 1
587735695913386092 211.12193 54.39810 0.102 GALAXY 1
......
#NGC 5471 field
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JeanTate
NVSS/FIRST contour overlay:
I think a zoomed-out overlay image may show some other radio emission in NGC5471 (later) ...
The image in this post was created from sources, and using methods, described in this RGZ Talk post. The center of the image is (211.122, 54.396)
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42jkb
scientist, admin
in response to JeanTate's comment.
The FIRST contours (red) in the image look like a double lobe AGN. Is this a chance alignment? Possibilities either way.
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JeanTate
in response to 42jkb's comment.
The FIRST contours (red) in the image look like a double lobe AGN. Is this a chance alignment? Possibilities either way.
Zooming in:
Doesn't really settle the question, does it? Could be two (local to the star cluster) sources, or a distant doublelobe/AGN, or ...
I'll do a (very) zoomed-out contour overlay image later ...
The image in this post was created from sources, and using methods, described in this RGZ Talk post. The image is centered at (211.122, 54.396)
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zutopian
Please look into following paper!:
A catalogue of ULX coincidences with FIRST radio sources
J.R. Sanchez-Sutil (1), A.J. Munoz-Arjonilla (1), J. Marti (2,1), J.L. Garrido (2,1), D. Perez-Ramirez (2,1), P. Luque-Escamilla (2,1)We search for ultra luminous X-ray source (ULXs) radio counterparts located in nearby galaxies in order to constrain their physical nature. Our work is based on a systematic cross-identification of the most recent and extensive available ULX catalogues and archival radio data. A catalogue of 70 positional coincidences is reported. Most of them are located within the galaxy nucleus. Among them, we find 11 new cases of non-nuclear ULX sources with possibly associated radio emission.
(Submitted on 22 May 2006)
http://arxiv.org/abs/astro-ph/0605555Online Material p 11:
Fig. 8. Several ULX sources (X9, X17, X26, and X29) with new FIRST radio counterpart candidates in the field of NGC 5457 (M 101).
The "large blue object" corresponds to X26 on the image (Fig. 8 ), doesn't it?
There is a statement about X26 on page 4!Posted
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JeanTate
A zoomed-out-even-more contour overlay image:
Not much different from the star-forming regions in the nearby arm, right? Maybe, close-up, some of them too have an apparent #hourglass morphology?
The image 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 (211.122, 54.396)
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