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titleISO Spectroscopy of ULIRGs and AGN: Lessons for Future Missions
Author(eng)Dieter, LUTZ
Author Affiliation(eng)Max-Planck-Institut für extraterrestrische Physik
Issue Date2000-12
PublisherInstitute of Space and Astronautical Science
Publication titleThe Institute of Space and Astronautical Science repot. S.P.
Start page99
End page106
Publication date2000-12
AbstractWith the advent of ISO, mid-infrared spectroscopy has become sensitive enoughfor detailed analyses of sizeable samples of galaxies. Mid-infrared aromatic emission features aredetected strongly and ubiquitously in star forming galaxies. They are absent close to an activegalactic nucleus but can be strong on larger scales of the AGN host, in particular, if there is intensecircumnuclear star formation. Through their nebular emission, hot star populations can be studiedin dusty environments like starburst galaxies. Starbursts seem to be normal in their hot star initialmass function but short lived due to strong negative feedback. The rich fine structure and coronalline spectrum of active galaxies can be used to reconstruct the otherwise unobservable extremeultraviolet emission of the AGN. Mid-infrared emission lines and continuum features provide newdiagnostics to discriminate between starburst and AGN activity in obscured galaxies. Using thesetools, 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 withluminosity above ~ 3 ×1012L, but there is no obvious trend for ULIRGs to be more AGN-likewith more advanced merger phase.
Document TypeDepartmental Bulletin Paper
JAXA Category宇宙科学研究所

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