Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50094l&link_type=abstract
Spitzer Proposal ID #50094
Computer Science
Scientific paper
We propose to obtain IRS spectra of a complete sample of nearby optically-identified Seyfert 2 galaxies. Multiwavelength observations already provide detailed measurements of both the active galactic nuclei (AGN) and nuclear starburst properties of the sample, including luminosity and star formation rate. We will accomplish four specific science goals with this program: * We will separate the effects of AGN alone from the significant fraction (nearly 50%) of composite nuclei, which contain both an AGN and a starburst. * We will measure the geometry of the distribution of the dusty material responsible for the MIR emission, comparing with numerical models we have developed and identifying relationships with stellar and AGN properties. * We will determine whether obscuration is significantly correlated with AGN luminosity or stellar luminosity. * We will test the reliability of common star formation diagnostics, such as the strength of polycyclic aromatic hydrocarbon emission, in the presence of an AGN. The results of these investigations will be directly applicable to unobscured AGN, where comparable short-wavelength probes of star formation are ineffective against the bright AGN. Moreover, these results will help to answer the central question of luminous and ultra-luminous infrared galaxies, namely whether these energetic galaxies are powered by star formation, AGN, or a combination of the two.
Levenson Nancy
Thompson Grant D.
Uddin S. A.
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