Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..478i&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present infrared L-band (3--4 μm) nuclear spectra of a large sample of nearby ultraluminous infrared galaxies (ULIRGs). Using the 3.3 μm polycyclic aromatic hydrocarbon (PAH) emission and absorption features found at 3--4 μm, we search for signatures of optically elusive powerful active galactic nuclei (AGNs) deeply buried in dust in all directions. Among ULIRGs classified optically as ``non-Seyfert'', the signatures of powerful buried AGNs are found in a much higher fraction of optical LINER ULIRGs than in HII-region ULIRGs. The evidence of AGNs is found in optical non-Seyfert ULIRGs with both warm and cool far-infrared colors. The overall spectral properties suggest that the total amount of dust around buried AGNs in optical non-Seyfert ULIRGs is systematically larger than that around AGNs in optical Seyfert 2 ULIRGs.
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