Integrated Spectral Energy Distributions of Nearby Seyfert 2 Galaxies: Implications for the Nature of Distant GOODS Sources

Details Integrated Spectral Energy Distributions of Nearby Seyfert 2 Galaxies: Implications for the Nature of Distant GOODS Sources Integrated Spectral Energy Distributions of Nearby Seyfert 2 Galaxies: Implications for the Nature of Distant GOODS Sources

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717405m&link_type=abstract

American Astronomical Society Meeting 207, #174.05; Bulletin of the American Astronomical Society, Vol. 37, p.1443

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Scientific paper

Studies of nearby X-ray galaxies have indicated that most of the hard (2--10 keV) X-ray background is produced by obscured AGNs at modest redshift. Locally, such objects have Seyfert 2 optical spectra dominated by strong, narrow emission lines. The deep Chandra survey results identifying a large fraction of faint, hard X-ray sources with optically normal galaxies --- not Seyfert 2s --- have thus provided one of the major surprises of the Chandra era. One possibility is that, because of their large distances and small angular sizes, the ground-based optical spectra of these objects are dominated by host galaxy emission, which makes them appear ``normal.'' To test this hypothesis, we have constructed an unbiased median spectral energy distribution (SED) for the nearby Seyfert 2 population. The Seyfert 2 SED is derived using data for 31 objects from a distance-limited sample; it covers 15 frequencies between the radio and hard X-ray bands, and to facilitate investigations of distant objects, it represents the integrated emission of the galaxies. A comparison to the SEDs of distant, spectroscopically ambiguous X-ray galaxies in the Great Observatories Origins Deep Survey (GOODS) fields reveals that some objects are well matched to the Seyfert 2 SED, while others are not.

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