Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535702h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #357.02; Bulletin of the American Astronomical Society, Vol. 42, p.540
Astronomy and Astrophysics
Astronomy
Scientific paper
Wide-area surveys have been of unquestionable importance to the astronomy community, allowing the discovery of new classes of source populations and creating countless opportunities for archival studies. Here I take advantage of the overlapping coverage of two surveys, Faint Images of the Radio Sky at Twenty Centimeters (FIRST) and the Sloan Digital Sky Survey (SDSS). By employing a median-stacking technique, I characterize the radio emission from diverse source populations with flux densities far below the FIRST detection threshold. I use this method to study galaxies in both the SDSS `Main' and `Luminous Red Galaxy' (LRG) samples that are classified as ``quiescent" on the basis of optical emission lines ratios. For LRGs, I find evidence of low-level AGN activity, and I stack a larger sample with photometric redshifts to evaluate the cosmic evolution of low-luminosity AGNs. Finally, I introduce a new radio survey: VLA observations of the SDSS Southern Equatorial Stripe (a.k.a. `Stripe 82'). This 1.4 GHz survey covers 90 sq. deg. with a resolution of 1.8" and a typical rms of 60 microJy. I present preliminary results of a study of AGN morphology and variability.
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