The Chandra Deep Field North Survey. XIII. 2 Ms Point-Source Catalogs

We present point-source catalogs for the ?2 Ms exposure of the Chandra Deep Field North, currently the deepest X-ray observation of the universe in the 0.5?8.0 keV band. Five hundred and three (503) X-ray sources are detected over an ?448 arcmin2 area in up to seven X-ray bands. Twenty (20) of these X-ray sources lie in the central ?5.3 arcmin2 Hubble Deep Field North (13,600 sources deg-2). The on-axis sensitivity limits are ?2.5 ? 10-17 ergs cm-2 s-1 (0.5?2.0 keV) and ?1.4 ? 10-16 ergs cm-2 s-1 (2?8 keV). Source positions are determined using matched-filter and centroiding techniques; the median positional uncertainty is ?03. The X-ray colors of the detected sources indicate a broad variety of source types, although absorbed AGNs (including a small number of possible Compton-thick sources) are clearly the dominant type. We also match lower significance X-ray sources to optical counterparts and provide a list of 79 optically bright (R 23) lower significance Chandra sources. The majority of these sources appear to be starburst and normal galaxies. The average backgrounds in the 0.5?2.0 keV and 2?8 keV bands are 0.056 and 0.135 counts Ms-1 pixel-1, respectively. The background count distributions are very similar to Poisson distributions. We show that this ?2 Ms exposure is approximately photon limited in all seven X-ray bands for regions close to the aim point, and we predict that exposures up to ?25 Ms (0.5?2.0 keV) and ?4 Ms (2?8 keV) should remain nearly photon limited. We demonstrate that this observation does not suffer from source confusion within ?6' of the aim point, and future observations are unlikely to be source-confusion limited within ?3' of the aim point even for source densities exceeding 100,000 deg-2. These analyses directly show that Chandra can achieve significantly higher sensitivities in an efficient, nearly photon-limited manner and be largely free of source confusion. To allow consistent comparisons, we have also produced point-source catalogs for the ?1 Ms Chandra Deep Field South (CDF-S). Three hundred and twenty-six (326) X-ray sources are included in the main Chandra catalog, and an additional 42 optically bright X-ray sources are included in a lower significance Chandra catalog. We find good agreement with the photometry of the previously published CDF-S catalogs; however, we provide significantly improved positional accuracy.

[1]  S. Borgani,et al.  New Results from the X-Ray and Optical Survey of the Chandra Deep Field-South: The 300 Kilosecond Exposure. II. , 2001, astro-ph/0103014.

[2]  D. M. Alexander,et al.  The Chandra Deep Field North Survey. V. 1 Ms Source Catalogs , 2001, astro-ph/0108404.

[3]  Mark Dickinson,et al.  The Great Observatories Origins Deep Survey , 2002, astro-ph/0204213.

[4]  Accepted for publication in ApJL Preprint typeset using L ATEX style emulateapj v. 25/04/01 THE CONSEQUENCES OF THE COSMIC STAR-FORMATION RATE: X-RAY NUMBER , 2001 .

[5]  I. Cagnoni.  Inflows, outflows, and reprocessing around black holes , 2002 .

[6]  Astrophysics,et al.  The HELLAS2XMM Survey. I. The X-Ray Data and the log N-log S Relation , 2001, astro-ph/0108514.

[7]  Robert Rosner,et al.  A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data , 2001 .

[8]  Judith G. Cohen,et al.  Counts and colours of faint galaxies in the U and R bands , 1997, astro-ph/9702241.

[9]  M. Dennefeld,et al.  ROSAT all sky survey observations of IRAS galaxies , 1992 .

[10]  W. Brandt,et al.  Very High Redshift X-Ray-selected Active Galactic Nuclei in the Chandra Deep Field-North , 2003, astro-ph/0301232.

[11]  S.Campana,et al.  The Resolved Fraction of the Cosmic X-Ray Background , 2003, astro-ph/0301555.

[12]  Isabella M. Gioia,et al.  The Einstein Observatory Extended Medium-Sensitivity Survey. II - The optical identifications , 1991 .

[13]  Roberto Gilmozzi,et al.  Chandra Deep Field South: The 1 Ms Catalog , 2002 .

[14]  The Nature of Radio Emission from Distant Galaxies: The 1.4 GHz Observations , 1999, astro-ph/9908313.

[15]  Richard E. Rothschild,et al.  The diffuse X-ray background spectrum from 3 to 50 keV. , 1980 .

[16]  Giuseppina Fabbiano,et al.  The X-ray spectra of galaxies. II - Average spectral properties and emission mechanisms , 1992 .

[17]  I. M. Stewart,et al.  The XMM-Newton serendipitous source catalogue , 2002 .

[18]  R. Della Ceca,et al.  A Medium Survey of the Hard X-Ray Sky with ASCA. II. The Source's Broadband X-Ray Spectral Properties , 1999 .

[19]  Jacqueline Bergeron,et al.  Understanding the sources of the X-ray background: VLT identifications in the Chandra/XMM-Newton deep field south , 2002 .

[20]  G. Zamorani,et al.  The X-ray spectra of the extragalactic sources in the Einstein extended medium sensitivity survey , 1988 .

[21]  R. Maiolino,et al.  The Distribution of Absorbing Column Densities among Seyfert 2 Galaxies , 1999, astro-ph/9902377.

[22]  N. Yamasaki,et al.  Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA , 2002, astro-ph/0204224.

[23]  E. Bertin,et al.  SExtractor: Software for source extraction , 1996 .

[24]  Martin C. Weisskopf,et al.  Chandra X-ray Observatory (CXO): overview , 1999, Astronomical Telescopes and Instrumentation.

[25]  The X-ray spectra of Compton-thick Seyfert 2 galaxies as seen by BeppoSAX , 2000, astro-ph/0005219.

[26]  D. M. Alexander,et al.  The Chandra Deep Field-North Survey. XI. X-Ray Emission from Luminous Infrared Starburst Galaxies , 2002, astro-ph/0202493.

[27]  The Chandra Deep Field North Survey. IX. Extended X-Ray Sources* , 2001, astro-ph/0112002.

[28]  W. Brandt,et al.  The Chandra Deep Field North Survey. X. X-Ray Emission from Very Red Objects , 2001, astro-ph/0111397.

[29]  Mark W. Bautz,et al.  Advanced CCD imaging spectrometer (ACIS) instrument on the Chandra X-ray Observatory , 2003, SPIE Astronomical Telescopes + Instrumentation.

[30]  P. Gondoin,et al.  XMM-Newton observatory. I. The spacecraft and operations , 2001 .

[31]  W. Brandt,et al.  Supermassive Black Hole Accretion History Inferred from a Large Sample of Chandra Hard X-Ray Sources , 2001, astro-ph/0106219.

[32]  R. Mushotzky,et al.  X-Ray Constraints on Accretion and Starburst Processes in Galactic Nuclei. I. Spectral Results , 1998, astro-ph/9808159.

[33]  E. Feigelson,et al.  The Chandra Deep Survey of the Hubble Deep Field North Area. IV. An Ultradeep Image of the HDF-N , 2001, astro-ph/0102411.

[34]  D. M. Alexander,et al.  The Chandra Deep Field North Survey. XIV. X-Ray-detected Obscured AGNs and Starburst Galaxies in the Bright Submillimeter Source Population , 2003 .

[35]  D. M. Alexander,et al.  The Chandra Deep Field North Survey. VI. The Nature of the Optically Faint X-Ray Source Population , 2001 .

[36]  W. N. Brandt,et al.  X-Ray, Optical, and Infrared Imaging and Spectral Properties of the 1 Ms Chandra Deep Field North Sources , 2002 .

[37]  J. Dunlop,et al.  MASS OF GALAXIES AT LOW AND HIGH REDSHIFT , 2003 .

[38]  F. Fiore,et al.  The BeppoSAX High Energy Large Area Survey (HELLAS) , 1998 .

[39]  Broos,et al.  Mitigating Charge Transfer Inefficiency in the Chandra X-Ray Observatory Advanced CCD Imaging Spectrometer. , 2000, The Astrophysical journal.

[40]  Roberto Gilmozzi,et al.  The Chandra Deep Field-South: The 1 Million Second Exposure* , 2002 .

[41]  R. F. Mushotzky,et al.  Resolving the extragalactic hard X-ray background , 2000, Nature.

[42]  W. N. Brandt,et al.  A Deep Chandra Catalog of X-Ray Point Sources toward the Galactic Center , 2003, astro-ph/0301371.

[43]  N. Gehrels.  Confidence limits for small numbers of events in astrophysical data , 1986 .

[44]  Louis Lyons,et al.  Book-Review - a Practical Guide to Data Analysis for Physical Science Students , 1992 .

[45]  Terrance J. Gaetz,et al.  Orbital measurement and verification of the Chandra X-ray Observatory's PSF , 2000, Astronomical Telescopes and Instrumentation.

[46]  C. Benoist,et al.  ESO imaging survey - Deep public survey: Multi-color optical data for the Chandra Deep Field South , 2001, astro-ph/0103071.

[47]  D. Burrows,et al.  Determination of Confidence Limits for Experiments with Low Numbers of Counts , 1991 .

[48]  D. M. Alexander,et al.  Optical and Infrared Properties of the 2 Ms Chandra Deep Field North X-Ray Sources , 2003, astro-ph/0306212.

[49]  K. Makishima,et al.  The ASCA Medium-Sensitivity Survey (The GIS Catalog Project): Source Counts and Evidence for Emerging Population of Hard Sources , 1999, astro-ph/9908128.

[50]  G. Hasinger,et al.  Sky surveys with ASCA — Deep Sky Survey , 1998 .

[51]  et al,et al.  The XMM-Newton Serendipitous Survey I. The role of XMM-Newton Survey Science Centre , 2000, astro-ph/0011463.

[52]  R. Giacconi,et al.  The ROSAT Deep Survey - VI. X-ray sources and Optical identifications of the Ultra Deep Survey , 2001 .

[53]  R. B. Partridge,et al.  Radio Emission from Galaxies in the Hubble Deep Field , 1998, astro-ph/9803343.

[54]  Roger G. Clowes,et al.  The New Era of Wide‐Field Astronomy , 2001 .

[55]  G. Trinchieri,et al.  The X-ray spectra of galaxies. I - Spectral fits of individual galaxies and X-ray colors , 1992 .

[56]  W. Brandt,et al.  The Chandra Deep Field North Survey. XII. The Link between Faint X-Ray and Radio Source Populations , 2002, astro-ph/0207433.

[57]  D. M. Alexander,et al.  The Chandra Deep Field North Survey. XV. Optically Bright, X-Ray-Faint Sources , 2003, astro-ph/0305086.

[58]  European Southern Observatory,et al.  XMM-Newton observation of the Lockman Hole - II. Spectral analysis , 2002, astro-ph/0207166.

[59]  R. Della Ceca,et al.  A Three-dimensional Diagnostic Diagram for Seyfert 2 Galaxies: Probing X-Ray Absorption and Compton Thickness , 1998, astro-ph/9811074.

[60]  A. Comastri,et al.  The 2-10 keV luminosity as a Star Formation Rate indicator , 2003 .

[61]  Gary J. Hill,et al.  Observations of Faint, Hard-Band X-Ray Sources in the Field of CRSS J0030.5+2618 with the Chandra X-Ray Observatory and the Hobby-Eberly Telescope* , 2000 .

[62]  P. P. Plucinsky,et al.  CHANDRA SPECTRA OF THE SOFT X-RAY DIFFUSE BACKGROUND , 2003 .

[63]  David W. Hogg.  Confusion errors in astrometry and counterpart association , 2001 .

[64]  M. J. Page,et al.  The XMM-Newton serendipitous survey: II. First results from the AXIS high galactic latitude medium sensitivity survey , 2002 .

[65]  C. Crawford,et al.  Infrared observations of serendipitous hard Chandra X-ray sources , 2000, astro-ph/0005242.

[66]  Xavier Barcons,et al.  The ROSAT International X-ray/Optical Survey (RIXOS): source catalogue , 2000 .

[67]  E. Feigelson,et al.  The Chandra Deep Survey of the Hubble Deep Field-North Area. II. Results from the Caltech Faint Field Galaxy Redshift Survey Area , 2001 .

[68]  ROBERT E. Williams,et al.  The Hubble Deep Field: Observations, Data Reduction, and , 1996, astro-ph/9607174.

[69]  A. Connolly,et al.  SPICES II: Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx , 2002, astro-ph/0203392.

[70]  A. Cimatti,et al.  Extremely Red Objects: An X-Ray Dichotomy , 2002, astro-ph/0211305.

[71]  R. Della Ceca,et al.  A Medium Survey of the Hard X-Ray Sky with the ASCA Gas Imaging Spectrometer: The (2-10 keV) Number Counts Relationship , 1998 .

[72]  J. A. Nousek,et al.  Modeling charge transfer inefficiency in the Chandra Advanced CCD Imaging Spectrometer , 2002 .

[73]  University of Cambridge,et al.  The Deepest X-Ray Look at the Universe , 2001, astro-ph/0108445.

[74]  Gutti Jogesh Babu,et al.  Statistical Challenges in Modern Astronomy , 1992 .

[75]  Chris Impey,et al.  Quasars as Absorption Probes of the Hubble Deep Field , 1999 .

[76]  Carl Heiles,et al.  The bell laboratories H I survey , 1992 .

[77]  Peter J. Serlemitsos,et al.  Complete x-ray sample of the high-latitude (Vertical BarbVertical Bar>20/sup 0/) sky from HEAO 1 A-2: Log N-log S and luminosity functions , 1982 .

[78]  G. C. Perola,et al.  Spectroscopic identification of ten faint hard X-ray sources discovered by Chandra , 2000 .