Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7201w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #72.01; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
Seyfert 2 galaxies provide an excellent spectral match to the X-ray background. However, optical observations of faint Chandra X-ray sources show that the population is dominated by apparently normal galaxies. One explanation is that that the distinguishing spectral features of distant Seyfert 2 nuclei are obscured by host-galaxy emission, which is significant in ground-based observations of high-redshift sources where spectral slits cover a large fraction of the host. Previous simulations using local Seyfert 2s revealed an apparent "transformation" of Seyfert 2s into normal galaxies when light was collected from the entire galaxy. In this paper we analyze spatially resolved spectra of nearby Seyfert 2s and their hosts to determine the fractional amount of extranuclear light necessary for these apparent transformations to occur or, equivalently, the redshifts at which distant Seyfert 2s might begin to appear as normal galaxies in integrated spectra.
We gratefully acknowledge support from NSF-REU grant AST-0353997 to the Keck Northeast Astronomy Consortium.
Moran Edward C.
Wallenstein Kelly
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