Radio Galaxy Zoo Talk

UGC 6081

  • mlpeck by mlpeck

    I'm not participating in this project and don't know if this is a RGZ target, but you might find this interesting. The galaxy centered in the crosshairs of the DR10 finder chart image below was in the Quench project sample as AGS00000z6. It was one of 22 objects in the Quench sample, and the lowest redshift one, that the SDSS spectro pipeline identified as #QSO.

    UGC 6081 was independently discovered to be an H I absorption line system by Bothun &Schommer (1983) and Williams & Brown (1983). According to the latter only 5 other absorption line systems were known at the time. It was also redetected by Darling et al. (2011) in "The ALFALFA H I Absorption Pilot Survey: A Wide-area Blind Damped Lyalpha System Survey of the Local Universe." Williams and Brown also obtained a 4.8GHz VLA map, reproduced below. Thanks to NED's precession calculator the position of the point source in their map coincides almost exactly with the fiber position of the QS object.

    Williams and Brown labeled the centered galaxy and the edge on disk that it appears to be merging with UGC6081/F (for face-on) and UGC6081/E respectively. The SDSS spectro pipeline calls UGC6081/F a #QSO; Bothun and Schommer had already noted that its optical spectrum was AGN-like. There is also a BOSS spectrum of the apparent nucleus of UGC 6081/E, and that also looks like a reddened AGN.

    This object is in several catalogs of AGN and radio sources, but I haven't found anything in the literature noting the post-starburst characteristics of the spectrum. It's possible the Quench project was the first to identify the spectrum as quenched, although Goto (2006) had compiled a catalog (apparently unpublished) of post-starburst AGN from SDSS DR2.

    ![enter image description here](http://skyserver.sdss3.org/public/en/tools/chart/image.aspx)

    enter image description here

    Posted

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

    Cool! 😃

    It is in RGZ; its ID is ARG00032tz. And by the lack of comments on it, I'd say none of the 'regulars' has had it to classify yet (I certainly haven't).

    FIRST contour overlay coming up ... Here:

    enter image description here

    enter image description here

    Radio-wise, two nuclear point-sources, right?

    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 SDSS J110017.98+100256.8.

    Posted

  • ivywong by ivywong scientist, admin

    What a great merging of Zoo worlds ! Welcome to Radio GZ @mlpeck.

    HI absorption is typically not as common because a galaxy has to have HI in the foreground of a strong radio source for an absorption feature to be observed. Typically strong radio galaxies or radio AGN are hosted by big elliptical galaxies with very low fractions of HI gas given how evolved these galaxies. Post-starbursts (in a merger environment) is special because the merger system may drive more fuel into the central SMBH while at the same time tearing out huge reservoirs of cold gas needed to form stars. --- possibly the case that is observed here 😃

    Here are more references to Tomo's work:
    Tomo(Goto) has published his catalogue of PSG from SDSS DR5 in http://adsabs.harvard.edu/abs/2007MNRAS.381..187G

    In 2004, he also studied the radio properties of E+A: http://adsabs.harvard.edu/abs/2004A%26A...427..125G

    His SDSS DR2 catalogue of E+A can be found here: http://adsabs.harvard.edu/abs/2005MNRAS.357..937G

    Hope this helps.

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