The origin of the diffuse X-ray background
The Einstein Deep Survey fields are used to reexamine the problem of the origin of the extragalactic diffuse X-ray background. An approach based on fluctuation analysis is adopted, and a sophisticated Monte Carlo scheme is used to compare the X-ray images with a variety of models representing point...
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| Veröffentlicht in: | Astrophys. J.; (United States) 1987-07, Vol.318 (1), p.93-102 |
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| container_title | Astrophys. J.; (United States) |
| container_volume | 318 |
| creator | Hamilton, T. T. Helfand, D. J. |
| description | The Einstein Deep Survey fields are used to reexamine the problem of the origin of the extragalactic diffuse X-ray background. An approach based on fluctuation analysis is adopted, and a sophisticated Monte Carlo scheme is used to compare the X-ray images with a variety of models representing point and diffuse source contributions. Results are presented for two classes of models: those which determine the flux cutoff beyond which pointlike sources fail to contribute significantly if the log N-log S slope is fixed at the measured value of -1.5, and those which set limits on the slope of the log N-log S relation below its last measured point at the Deep Survey threshold. In both cases, it is found that the known population of X-ray-emitting quasars and any reasonable extrapolations therefrom do not comprise the entire X-ray background. |
| doi_str_mv | 10.1086/165353 |
| format | Article |
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In both cases, it is found that the known population of X-ray-emitting quasars and any reasonable extrapolations therefrom do not comprise the entire X-ray background.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1086/165353</identifier><identifier>CODEN: ASJOAB</identifier><language>eng</language><publisher>Legacy CDMS: University of Chicago Press</publisher><subject>640101 - Astrophysics & Cosmology- Cosmic Radiation ; Astronomy ; Astrophysics ; BACKGROUND RADIATION ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COSMIC PHOTONS ; COSMIC RADIATION ; COSMIC RADIO SOURCES ; COSMIC RAY SOURCES ; COSMIC X-RAY SOURCES ; Earth, ocean, space ; ELEMENTARY PARTICLES ; Exact sciences and technology ; FLUX DENSITY ; GALAXY NUCLEI ; IONIZING RADIATIONS ; MASSLESS PARTICLES ; ORIGIN ; PHOTONS ; POINT SOURCES ; QUASARS ; RADIANT FLUX DENSITY ; RADIATION SOURCES ; RADIATIONS ; Stellar systems. 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T.</creatorcontrib><creatorcontrib>Helfand, D. J.</creatorcontrib><creatorcontrib>Columbia Univ., NY</creatorcontrib><title>The origin of the diffuse X-ray background</title><title>Astrophys. J.; (United States)</title><description>The Einstein Deep Survey fields are used to reexamine the problem of the origin of the extragalactic diffuse X-ray background. An approach based on fluctuation analysis is adopted, and a sophisticated Monte Carlo scheme is used to compare the X-ray images with a variety of models representing point and diffuse source contributions. Results are presented for two classes of models: those which determine the flux cutoff beyond which pointlike sources fail to contribute significantly if the log N-log S slope is fixed at the measured value of -1.5, and those which set limits on the slope of the log N-log S relation below its last measured point at the Deep Survey threshold. In both cases, it is found that the known population of X-ray-emitting quasars and any reasonable extrapolations therefrom do not comprise the entire X-ray background.</description><subject>640101 - Astrophysics & Cosmology- Cosmic Radiation</subject><subject>Astronomy</subject><subject>Astrophysics</subject><subject>BACKGROUND RADIATION</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COSMIC PHOTONS</subject><subject>COSMIC RADIATION</subject><subject>COSMIC RADIO SOURCES</subject><subject>COSMIC RAY SOURCES</subject><subject>COSMIC X-RAY SOURCES</subject><subject>Earth, ocean, space</subject><subject>ELEMENTARY PARTICLES</subject><subject>Exact sciences and technology</subject><subject>FLUX DENSITY</subject><subject>GALAXY NUCLEI</subject><subject>IONIZING RADIATIONS</subject><subject>MASSLESS PARTICLES</subject><subject>ORIGIN</subject><subject>PHOTONS</subject><subject>POINT SOURCES</subject><subject>QUASARS</subject><subject>RADIANT FLUX DENSITY</subject><subject>RADIATION SOURCES</subject><subject>RADIATIONS</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. The universe</subject><subject>Unidentified sources and radiation outside the solar system</subject><subject>X-ray sources ; x-ray bursts</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1987</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNo90EtLAzEUBeAgCtaqv8DFIOJCGL2ZO3ktpfiCgpsK3YVMJmmjNVOS6aL_vlNGXF0OfPcsDiHXFB4pSP5EOUOGJ2RCGcqyRiZOyQQA6pKjWJ6Ti5y_j7FSakIeFmtXdCmsQiw6X_RDaoP3u-yKZZnMvmiM_VmlbhfbS3LmzSa7q787JV-vL4vZezn_fPuYPc9LWyH0JTIpKuqsMlwiSkmZM85ZNKLxrgUKjnkFXtWCUsZpQxtmGqE8G_7aVlQ4Jbdjb5f7oLMNvbNr28XobK858poJGND9iGzqck7O620KvybtNQV9nEGPMwzwboRbk63Z-GSiDflfC4a1qo99NyOLJhsd-5Q1VVIAMIUg8AA5qWFY</recordid><startdate>19870701</startdate><enddate>19870701</enddate><creator>Hamilton, T. T.</creator><creator>Helfand, D. 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J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c230t-358721ec9a68338815eaeec3a7bfed010e5f90f94711561b1b5ab79f5587dd723</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1987</creationdate><topic>640101 - Astrophysics & Cosmology- Cosmic Radiation</topic><topic>Astronomy</topic><topic>Astrophysics</topic><topic>BACKGROUND RADIATION</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COSMIC PHOTONS</topic><topic>COSMIC RADIATION</topic><topic>COSMIC RADIO SOURCES</topic><topic>COSMIC RAY SOURCES</topic><topic>COSMIC X-RAY SOURCES</topic><topic>Earth, ocean, space</topic><topic>ELEMENTARY PARTICLES</topic><topic>Exact sciences and technology</topic><topic>FLUX DENSITY</topic><topic>GALAXY NUCLEI</topic><topic>IONIZING RADIATIONS</topic><topic>MASSLESS PARTICLES</topic><topic>ORIGIN</topic><topic>PHOTONS</topic><topic>POINT SOURCES</topic><topic>QUASARS</topic><topic>RADIANT FLUX DENSITY</topic><topic>RADIATION SOURCES</topic><topic>RADIATIONS</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><topic>Unidentified sources and radiation outside the solar system</topic><topic>X-ray sources ; x-ray bursts</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hamilton, T. T.</creatorcontrib><creatorcontrib>Helfand, D. J.</creatorcontrib><creatorcontrib>Columbia Univ., NY</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hamilton, T. T.</au><au>Helfand, D. J.</au><aucorp>Columbia Univ., NY</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The origin of the diffuse X-ray background</atitle><jtitle>Astrophys. J.; (United States)</jtitle><date>1987-07-01</date><risdate>1987</risdate><volume>318</volume><issue>1</issue><spage>93</spage><epage>102</epage><pages>93-102</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>The Einstein Deep Survey fields are used to reexamine the problem of the origin of the extragalactic diffuse X-ray background. An approach based on fluctuation analysis is adopted, and a sophisticated Monte Carlo scheme is used to compare the X-ray images with a variety of models representing point and diffuse source contributions. Results are presented for two classes of models: those which determine the flux cutoff beyond which pointlike sources fail to contribute significantly if the log N-log S slope is fixed at the measured value of -1.5, and those which set limits on the slope of the log N-log S relation below its last measured point at the Deep Survey threshold. In both cases, it is found that the known population of X-ray-emitting quasars and any reasonable extrapolations therefrom do not comprise the entire X-ray background.</abstract><cop>Legacy CDMS</cop><pub>University of Chicago Press</pub><doi>10.1086/165353</doi><tpages>10</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-637X |
| ispartof | Astrophys. J.; (United States), 1987-07, Vol.318 (1), p.93-102 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_crossref_primary_10_1086_165353 |
| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | 640101 - Astrophysics & Cosmology- Cosmic Radiation Astronomy Astrophysics BACKGROUND RADIATION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC PHOTONS COSMIC RADIATION COSMIC RADIO SOURCES COSMIC RAY SOURCES COSMIC X-RAY SOURCES Earth, ocean, space ELEMENTARY PARTICLES Exact sciences and technology FLUX DENSITY GALAXY NUCLEI IONIZING RADIATIONS MASSLESS PARTICLES ORIGIN PHOTONS POINT SOURCES QUASARS RADIANT FLUX DENSITY RADIATION SOURCES RADIATIONS Stellar systems. Galactic and extragalactic objects and systems. The universe Unidentified sources and radiation outside the solar system X-ray sources x-ray bursts |
| title | The origin of the diffuse X-ray background |
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