期刊
ASTRONOMICAL JOURNAL
卷 122, 期 6, 页码 2810-2832出版社
UNIV CHICAGO PRESS
DOI: 10.1086/324105
关键词
catalogs; cosmology : observations; galaxies : active; galaxies : general; galaxies : nuclei; surveys; X-rays
An extremely deep X-ray survey (approximate to1 Ms) of the Hubble Deep Field North (HDF-N) and its environs (approximate to 450 arcmin(2)) has been performed with the Advanced CCD Imaging Spectrometer on board the Chandra X-Ray Observatory. This is one of the two deepest X-ray surveys ever performed; for point sources near the aim point, it reaches 0.5-2.0 and 2-8 keV flux limits of approximate to3 x 10(-17) and approximate to2 x 10(-16) ergs cm(-2) s(-1), respectively. Here we provide source catalogs, along with details of the observations, data reduction, and technical analysis. Observing conditions, such as background, were excellent for almost all of the exposure. We have detected 370 distinct point sources : 360 in the 0.5-8.0 keV band, 325 in the 0.5-2.0 keV band, 265 in the 2-8 keV band, and 145 in the 4-8 keV band. Two new Chandra sources in the HDF-N itself are reported and discussed. Source positions are accurate to within 0.6-1.7 (at approximate to 90% conDdence), depending mainly on the off-axis angle. We also detect two highly signiDcant extended X-ray sources and several other likely extended X-ray sources. We present basic number count results for sources located near the center of the field. Source densities of 7100(-940)(+1100) deg(-2) (at 4.2 x 10(-17) ergs cm(-2) s(-1)) and 4200(-580)(+670) deg(-2) (at 3.8 x 10(-16) ergs cm(-2) s(-1)) are observed in the soft and hard bands, respectively.
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