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28 March 2024
 
  » arxiv » astro-ph/0210310

 Article overview


The AGN Source Population in the Chandra Deep Field-North Survey: Constraints from X-ray Spectroscopy and Variability
F.E. Bauer ; C. Vignali ; D.M. Alexander ; W.N. Brandt ; G.P. Garmire ; A.E. Hornschemeier ; P. Broos ; L. Townsley ; D.P. Schneider ;
Date 14 Oct 2002
Subject astro-ph
AffiliationPSU
AbstractWe briefly report here on our ongoing X-ray spectroscopy and variability analyses of 136 faint X-ray sources discovered in the 2 Ms Chandra Deep Field North observations spanning 1.4x10-15 to 2x10-13 ergs s-1 cm-2. Most sources are adequatley fitted with a simple intrinsic absorption plus power-law model, although the resulting photon index is much lower than the canonical average unabsorbed spectral slope found locally (suggesting additional spectral complexity). Among the 136 sources, 7% show significant Fe (Ka) emission features, with equivalent widths in the range 0.1-1.3 keV. Two of these emission-line sources appear to be Compton thick. For the subset of sources with redshifts, we also find that fewer than 10% are likely to be Compton thick. Finally, ~60% of the sample show signs of long-term variability. This fraction climbs to ~90% for the bright sources (>500 cnts) or BLAGN.
Source arXiv, astro-ph/0210310
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