NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-21 T06:42:26 PDT
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For refcode 2008ApJ...675...96S:
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2008ApJ...675...96S 3-5 micron Spectroscopy of Obscured AGNs in ULIRGs Sani, E.; Risaliti, G.; Salvati, M.; Maiolino, R.; Marconi, A.; Berta, S.; Braito, V.; Della Ceca, R.; Franceschini, A. Abstract. We present the results of infrared L-band (3-4 micron) and M-band (4-5 micron) Very Large Telescope (VLT) ISAAC spectroscopy of five bright ultraluminous infrared galaxies (ULIRGs) hosting an AGN. From our analysis we distinguish two types of sources: ULIRGs in which the AGN is unobscured (with a flat continuum and no absorption features at 3.4 and 4.6 micron), and those with highly obscured AGNs (with a steep, reddened continuum and absorption features due to hydrocarbons and CO). Starburst activity is also present in all of the sources, as inferred from the 3.3 micron PAH emission line. A strong correlation is found between continuum slope and CO optical depth, which suggests that deep carbon monoxide absorption is a common feature of highly obscured ULIRG AGNs. Finally, we show that the AGN dominates the 3-4 micron emission, even if its contribution to the bolometric luminosity is small. Key words: Galaxies: Active, Galaxies: Starburst, Infrared: Galaxies
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