Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000isass..14...99l&link_type=abstract
The Institute of Space and Astronautical Science Report SP No. 14, p. 99-106.
Other
1
Galaxies: Active, Galaxies: Starburst, Infrared: Galaxies, Galaxies: Ism
Scientific paper
With the advent of ISO, mid-infrared spectroscopy has become sensitive enough for detailed analyses of sizeable samples of galaxies. Mid-infrared aromatic emission features are detected strongly and ubiquitously in star forming galaxies. They are absent close to an active galactic nucleus but can be strong on larger scales of the AGN host, in particular, if there is intense circumnuclear star formation. Through their nebular emission, hot star populations can be studied in dusty environments like starburst galaxies. Starbursts seem to be normal in their hot star initial mass function but short lived due to strong negative feedback. The rich fine structure and coronal line spectrum of active galaxies can be used to reconstruct the otherwise unobservable extreme ultraviolet emission of the AGN. Mid-infrared emission lines and continuum features provide new diagnostics to discriminate between starburst and AGN activity in obscured galaxies. Using these tools, most ultraluminous infrared galaxies are found to be predominantly starburst powered. Trends can be searched for in a larger sample of ULIRGs. The fraction of AGNs increases with luminosity above ~3x1012Lsolar, but there is no obvious trend for ULIRGs to be more AGN-like with more advanced merger phase.
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