Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.8203s&link_type=abstract
American Astronomical Society Meeting 204, #82.03; Bulletin of the American Astronomical Society, Vol. 36, p.815
Astronomy and Astrophysics
Astronomy
Scientific paper
We present first results of Spitzer spectroscopy of the nearby spiral galaxy NGC 7331 from SINGS, the Spitzer Infrared Nearby Galaxies Survey. Spitzer's Infrared Spectrograph (IRS) was used to spectrally map various-sized regions centered on the nucleus, and covering the prominent star-forming ring. We highlight the discovery of a new broad PAH band at 17.1\micron, which is nearly half as strong as the ubiquitous 11.3\micron\ feature. We also explore the excitation source of NGC 7331's LINER nucleus using spatially resolved [O\textsc{iv}] emission, uncover variations on kpc scales in the PAH feature band strengths from the spectral cubes, and constrain H\textsc{ii} region and PDR density and incident ultraviolet field intensity using fine structure and H2 lines. This work highlights how the sensitivity and versatility of the IRS will lead to new insights into the physical processes that dominate gas and dust behavior in the full range of galactic environments.
Armus Lee
Bendo George
Calzetti Daniela
Dale Daniel A.
Draine Bruce T.
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