Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341803h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #418.03; Bulletin of the American Astronomical Society, Vol. 41, p.230
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a first look at the general radio properties of 1.2 million Luminous Red Galaxies (LRGs). The sample comes from a catalog of LRG photometric redshifts constructed from the Sloan Digital Sky Survey (SDSS) imaging data and has a median 1.4 GHz flux density of 40 μJy. To probe the radio properties of these faint galaxies, we employ a stacking technique whereby image cutouts at each optical LRG position from the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) survey are sorted by the parameter of interest and median-combined within bins. We find that median radio luminosity scales with optical luminosity, with L1.4 GHz ˜ Lr1/2. The median radio luminosity also shows evidence of significant cosmic evolution, implying a 30% increase in AGN heating between z = 0.45 and z = 0.6 from these very low-luminosity AGN. By matching against the FIRST catalog, we determine that 0.3% of the sample are associated with double-lobed radio galaxies. A smaller sample of 1314 ``most-likely" double-lobed candidates lies on the dividing line between FR I/IIs based on a radio/optical luminosity cut. We investigate correlations with physical size of the radio galaxies in the context of orientation-based unification schemes and self-similar expansion models.
Becker Robert H.
Hodge Jacqueline
White Richard L.
Zeimann Gregory
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