Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.7401g&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #74.01; Bulletin of the American Astronomical Society, Vol. 32, p.1519
Other
Scientific paper
The Chandra X-ray Observatory (CXC) has observed the HDF-N region (a 17' by 19' area including the HDF-N) for 224.7 ks as of this writing. Another 775 ks will be devoted to this region in the next six months. A total of about 200 sources have been detected in the 0.5 - 8.0 keV energy band. The 2.0 - 8.0 keV Log N(>S) vs Log S plot, where N is the areal density of sources and S the flux, reveals that the bulk of the sky flux comes from sources brighter than 10-14 ergs/cm2/s. The majority of these sources lies closer than a redshift of 1, based on 51 redshifts measured thus far. The X-ray spectra of the sources show a gradual hardening with decreasing source intensity, with the fainter sources (3 x 10-15 ergs/cm2/s in the 0.5 - 10.0 keV band) exhibiting a photon number spectral slope of 1.35+/-0.2. This work is supported in part by NASA grant NAS 8-38252(GPG PI), NASA GSRP grant NGT5-50247 (AEH), NSF CAREER award AST-9983783 and the Alfred P. Sloan Foundation (WNB), and NSF grant AST99-00703 (DPS).
Barger Amy. J.
Bautz Mark W.
Brandt Wiliam N.
Broos Patrick S.
Burrows David N.
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