A Spitzer Mid-IR Spectroscopic View of LINERs - Finding AGN in Dusty Galaxies

Details A Spitzer Mid-IR Spectroscopic View of LINERs - Finding AGN in Dusty Galaxies A Spitzer Mid-IR Spectroscopic View of LINERs - Finding AGN in Dusty Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9723m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #97.23; Bulletin of the American Astronomical Society, Vol. 39, p.907

Astronomy and Astrophysics

Astronomy

Scientific paper

We have conducted a mid-infrared spectroscopic archival study of low ionization emission line galaxies (LINERs) observed by the high resolution modules of the Infrared Spectrograph on board Spitzer. These observations reveal the presence of high ionization fine-structure line emission suggestive of active galactic nuclei (AGNs) in a large fraction of LINERs, most of which show no definitive signatures of AGN at optical wavelengths. Based on combined X-ray imaging and mid-IR spectroscopic observations, we find that the AGN detection rate is at least 75%, implying that the majority of LINERs are AGN. Our study demonstrates that optically studies are insensitive to finding the vast majority of LINERs with active black holes. This is particularly true in the most infrared-bright objects which constitute the dominant population of LINERs.

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