Feeding the greedy: Spitzer spectroscopy of Narrow Line Seyfert 1 galaxies

Details Feeding the greedy: Spitzer spectroscopy of Narrow Line Seyfert 1 galaxies Feeding the greedy: Spitzer spectroscopy of Narrow Line Seyfert 1 galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20241l&link_type=abstract

Spitzer Proposal ID #20241

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Scientific paper

Narrow Line Seyfert 1 galaxies (NLS1) are a class holding unique clues as to the nature and evolution of AGN. Their extreme optical and X-ray spectral properties are generally believed to be due to rapid accretion at high L/L_Edd onto the nuclear black hole. NLS1 are tracing phases of active black hole growth, which are suggested to be connected to intense circumnuclear star formation events. We have assembled a team with expertise in X-ray and optical studies of NLS1, and in mid-infrared spectroscopy of galaxies, with the purpose of a detailed low and high resolution IRS spectroscopic study of 20 of the best observed local NLS1. We will study both aspects of feeding the AGN and of AGN feedback, in a project that has three main elements: (1) Rely on the high sensitivity and spatial resolution of IRS low-resolution spectra to use the aromatic `PAH' features to detect and spatially locate star formation, testing the suggestion that NLS1 are connected to intense circumnuclear starbursts. (2) Obtain a full characterization of the nuclear mid-infrared emission line spectrum from Narrow Line Region and X-ray Dominated Regions, to better determine excitation and physical conditions in the near-nuclear regions, already known to differ from the conditions in other AGN. (3) Support the analysis of the first two questions by performing a detailed comparison of the NLS1 properties to IRS spectra of other active and inactive local galaxies, already being obtained by us and other teams in earlier Spitzer projects.

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