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          Institute: MPI für extraterrestrische Physik     Collection: Infrared and Submillimeter Astronomy     Display Documents

ID: 10749.0, MPI für extraterrestrische Physik / Infrared and Submillimeter Astronomy
Mid-infrared line diagnostics of active galaxies - A spectroscopic AGN survey with ISO-SWS
Authors:Sturm, E.; Lutz, D.; Verma, A.; Netzer, H.; Sternberg, A.; Moorwood, A. F. M.; Oliva, E.; Genzel, R.
Date of Publication (YYYY-MM-DD):2002-10
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:3
Start Page:821
End Page:841
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present medium resolution (R similar to 1500) ISO-SWS 2.4-45 mum spectra of a sample of 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow line regions and (circum-) nuclear star formation regions, and it provides a coherent spectroscopic reference for future extragalactic studies in the mid-infrared. We use the data set to briefly discuss the physical conditions in the narrow line regions (density, temperature, excitation, line profiles) and to test for possible differences between AGN sub- types. Our main focus is on new tools for determining the properties of dusty galaxies and on the AGN-starburst connection. We present mid-IR line ratio diagrams which can be used to identify composite (starburst + AGN) sources and to distinguish between emission excited by active nuclei and emission from (circum- nuclear) star forming regions. For instance, line ratios of high to low excitation lines like [OIV] 25.9 mum [Ne II] 12.8 mum, that have been used to probe for AGNs in dusty objects, can be examined in more detail and with better statistics now. In addition, we present two- dimensional diagnostic diagrams that are fully analogous to classical optical diagnostic diagrams, but better suited for objects with high extinction. Finally, we discuss correlations of mid-infrared line fluxes to the mid- and far-infrared continuum. We compare these relations to similar relations in starburst galaxies in order to examine the contribution of AGNs to the bolometric luminosities of their host galaxies. The spectra are available in electronic form from the authors.
Free Keywords:infrared : galaxies; galaxies : active; galaxies : Seyfert; galaxies : starburst
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Max Planck Inst Extraterr Phys, Postfach 1312, D-85741; Garching, Germany; Max Planck Inst Extraterr Phys, D-85741 Garching, Germany; Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel; Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Wise Observ, IL-69978 Tel Aviv, Israel; European So Observ, D-85748 Garching, Germany; Osserv Astrofis Arcetri, I-50125 Florence, Italy; Telescopio Nazl Galileo, Santa Cruz De La Palma 38700, TF, Spain; Ctr Galileo Galilei, Santa Cruz De La Palma 38700, TF, Spain
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