FIRST-2MASS Red Quasars: Transitional Objects Emerging from the Dust

Details FIRST-2MASS Red Quasars: Transitional Objects Emerging from the Dust FIRST-2MASS Red Quasars: Transitional Objects Emerging from the Dust

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920903g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #209.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We have identified a sample of 120 dust-reddened quasars by matching radio sources detected at 1.4 GHz with the near-infrared 2MASS catalog and color-selecting red sources. Optical and/or near-infrared spectroscopy provide broad wavelength sampling of their spectral energy distributions that we use to determine their reddening, E(B-V). This sample spans a wide range in redshift and reddening (0.1 < z < 3, 0.1 < E(B-V) < 1.5), which we use to investigate the effect of luminosity on reddening and its evolution with redshift. At every redshift, dust-reddened quasars are intrinsically the most luminous quasars. We interpret this in the context of merger-driven quasar/galaxy co-evolution where these reddened quasars are revealing an emergent phase where the heavily obscured quasar is shedding its cocoon of dust prior to becoming a "normal" blue quasar. We estimate, based on the fraction of objects in this phase, that its duration is 20% as long as the unobscured, blue quasar phase.

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