Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20511010m&link_type=abstract
American Astronomical Society Meeting 205, #110.10; Bulletin of the American Astronomical Society, Vol. 36, p.1536
Astronomy and Astrophysics
Astronomy
Scientific paper
We have developed a method to decompose mid-infrared spectra into a single PAH component and several silicate-graphite dust components, performing a least-squares fit to obtain the temperature and optical depth of each. Here, we use this method to analyze the set of ultraluminous infrared galaxy (ULIRG) spectra obtained with the IRS onboard the Spitzer Space Telescope as part of the GTO program. ULIRGs are defined as galaxies with infrared (8-1000 μm) luminosities in excess of 1012 LSun. This energy is produced by both AGN and starburst activity, with the fraction of energy produced by each process varying from galaxy to galaxy. The parameters returned by the fit procedure reveal the physical composition of ULIRGs but do not necessarily constrain their geometric structure. We find that the luminosity of the PAH component increases and the ratio of the PAH to dust continuum luminosity decreases as the total mid-infrared luminosity of a galaxy increases.
Armus Lee
Charmandaris Vassilios
Herter Terry L.
Marshall Andrew J.
Spoon Henrik Willem Walter
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