A Large Population of Optically Unidentified AGNs in Dust-Obscured Starburst Galaxies

Details A Large Population of Optically Unidentified AGNs in Dust-Obscured Starburst Galaxies A Large Population of Optically Unidentified AGNs in Dust-Obscured Starburst Galaxies

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408...59g&link_type=abstract

The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the first volume-limited Spitzer-IRS search for AGN activity in the most bolometrically luminous galaxies (LIR≈~(0.3--20)~× 1010~L&sun;)} to D<15~Mpc. We unambiguously identify AGNs in ≈~27% of the galaxies, ≈~50% of which are not identified with optical spectroscopy. We discover that the optically unidentified AGNs have comparable luminosities to the optically identified AGNs and are hosted in a wide range of galaxy types (S0--Sd). However, by constrast, we find that optically unidentifed AGNs are more likely to reside in heavily dust-obscured starburst galaxies than optically identified AGNs.

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