Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7104h&link_type=abstract
American Astronomical Society Meeting 208, #71.04; Bulletin of the American Astronomical Society, Vol. 38, p.149
Astronomy and Astrophysics
Astronomy
Scientific paper
The SDSS has demonstrated amazing success in expanding catalogs of previously identified object classes and also has stretched the boundaries of physically defining characteristics for many classes such as high redshift QSOs. One notable exception to this success is detecting optical counterparts for radio sources; SDSS is identifying potential candidates for less than one third of the FIRST radio sources. My near infrared (NIR) investigation, using a new imager on the ARC 3.5 meter telescope, has partially revealed the nature of the missed radio population. Most of the missed objects are high power AGN at redshifts beyond z = 1 with heavy dust shrouds in the nuclear region. The combination of extinction and distance places the objects beyond even a moderately deep optical survey such as SDSS, but not beyond simple NIR detection. I report on the success of this investigative approach, recommend optimal search methods, and predict the potential of extended NIR searches such as UKIDSS. Additionally, the population characteristics are discussed with implications for AGN life cycles and related galaxy evolution.
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