Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..357..218a&link_type=abstract
The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present spectra taken with the Infrared Spectrograph on Spitzer covering the 5-38μm region of the ten Ultraluminous Infrared Galaxies (ULIRGs) found in the IRAS Bright Galaxy Sample. Among the BGS ULIRGs, we find a factor of 50 spread in the spectral slope from 5.5-60μm in the rest frame. There is evidence for water ice and hydrocarbon absorption (from 5.5-6.5μm) in 7/10 BGS ULIRGs, as well as absorption features of C2H2 and HCN in four and possibly six of the 10 BGS ULIRGs, indicating shielded molecular clouds and a warm, dense ISM. We have detected [NeV] emission at 14.3μm and 24.3μm in three out of the 10 BGS ULIRGs. The AGN fractions implied by either the [NeV]/[NeII] or [OIV]/[NeII] line flux ratios (or their upper limits) are significantly lower than implied by the MIR slope or strength of the 6.2μm PAH EQW feature.
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