The Chandra Deep Survey of the Hubble Deep Field North Area. II. Results from the Caltech Faint Field Galaxy Redshift Survey Area

A deep X-ray survey of the Hubble Deep Field North (HDF-N) and its environs is performed using data collected by the Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-ray Observatory . Currently a 221.9 ks exposure is available, the deepest ever presented, and here we give results on X-ray sources located in the 8.6×8.7 area covered by the Caltech Faint Field Galaxy Redshift Survey (the “Caltech area”). This area has (1) deep photometric coverage in several optical and near-infrared bands, (2) extensive coverage at radio, submillimeter and mid-infrared wavelengths, and (3) some of the deepest and most complete spectroscopic coverage ever obtained. It is also where the X-ray data have the greatest sensitivity; the minimum detectable fluxes in the 0.5–2 keV (soft) and 2–8 keV (hard) bands are ≈ 1.3 × 10−16 erg cm−2 s−1 and ≈ 6.5× 10−16 erg cm−2 s−1, respectively. More than ≈ 80% of the extragalactic X-ray background in the hard band is resolved. Based on observations obtained at the W. M. Keck Observatory which is operated jointly by the California Institute of Technology and the University of California. Based on observations obtained by the Hobby-Eberly Telescope, which is a joint project of The University of Texas at Austin, The Pennsylvania State University, Stanford University, Ludwig-Maximillians-Universität München, and Georg-August-Universität Göttingen. Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 Department of Astronomy, University of Wisconsin-Madison, 475 N. Charter Street, Madison, WI 53706 Hubble Fellow and Chandra Fellow at Large Visiting Astronomer, W.M. Keck Observatory, jointly operated by the California Institute of Technology and the University of California Massachusetts Institute of Technology, Center for Space Research, 70 Vassar Street, Building 37, Cambridge, MA 02139 Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213 Astrophysics Division, ESTEC, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands Palomar Observatory, California Institute of Technology, Pasadena, CA 91125