SMM detection of diffuse Galactic 511 keV annihilation radiation
Observations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of...
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| Veröffentlicht in: | Astrophys. J.; (United States) 1988-03, Vol.326 (2), p.717-732 |
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| container_issue | 2 |
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| container_title | Astrophys. J.; (United States) |
| container_volume | 326 |
| creator | Share, G. H. Kinzer, R. L. Kurfess, J. D. Messina, D. C. Purcell, W. R. |
| description | Observations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of its properties used in the analysis are described, and the methods used for accumulating, fitting, and analyzing the data are outlined. It is shown how the Galactic 511 keV line was separated from the intense and variable background observed in orbit. The SMM observations are compared with previous measurements of annihilation radiation from the Galactic center region, and the astrophysical implications are discussed. It is argued that most of the measurements made to date suggest the presence of an extended Galactic source of annihilation radiation. |
| doi_str_mv | 10.1086/166130 |
| format | Article |
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H. ; Kinzer, R. L. ; Kurfess, J. D. ; Messina, D. C. ; Purcell, W. R.</creator><creatorcontrib>Share, G. H. ; Kinzer, R. L. ; Kurfess, J. D. ; Messina, D. C. ; Purcell, W. R. ; E. O. Hulburt Center for Space Research, Washington, DC (USA)</creatorcontrib><description>Observations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of its properties used in the analysis are described, and the methods used for accumulating, fitting, and analyzing the data are outlined. It is shown how the Galactic 511 keV line was separated from the intense and variable background observed in orbit. The SMM observations are compared with previous measurements of annihilation radiation from the Galactic center region, and the astrophysical implications are discussed. It is argued that most of the measurements made to date suggest the presence of an extended Galactic source of annihilation radiation.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1086/166130</identifier><identifier>CODEN: ASJOAB</identifier><language>eng</language><publisher>Legacy CDMS: University of Chicago Press</publisher><subject>640105 - Astrophysics & Cosmology- Galaxies ; ANNIHILATION ; ANTILEPTONS ; ANTIMATTER ; ANTIPARTICLES ; Astronomy ; BASIC INTERACTIONS ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COMPARATIVE EVALUATIONS ; Earth, ocean, space ; ELECTROMAGNETIC INTERACTIONS ; ELECTROMAGNETIC RADIATION ; ELEMENTARY PARTICLES ; Exact sciences and technology ; FERMIONS ; Fundamental aspects of astrophysics ; Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations ; GALAXIES ; GALAXY NUCLEI ; GAMMA RADIATION ; INTERACTIONS ; IONIZING RADIATIONS ; LEPTONS ; MEASURING INSTRUMENTS ; MILKY WAY ; POSITRONS ; Radiation mechanisms, polarization ; RADIATIONS ; Space Radiation ; SPECTROMETERS</subject><ispartof>Astrophys. 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R.</creatorcontrib><creatorcontrib>E. O. Hulburt Center for Space Research, Washington, DC (USA)</creatorcontrib><title>SMM detection of diffuse Galactic 511 keV annihilation radiation</title><title>Astrophys. J.; (United States)</title><description>Observations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of its properties used in the analysis are described, and the methods used for accumulating, fitting, and analyzing the data are outlined. It is shown how the Galactic 511 keV line was separated from the intense and variable background observed in orbit. The SMM observations are compared with previous measurements of annihilation radiation from the Galactic center region, and the astrophysical implications are discussed. It is argued that most of the measurements made to date suggest the presence of an extended Galactic source of annihilation radiation.</description><subject>640105 - Astrophysics & Cosmology- Galaxies</subject><subject>ANNIHILATION</subject><subject>ANTILEPTONS</subject><subject>ANTIMATTER</subject><subject>ANTIPARTICLES</subject><subject>Astronomy</subject><subject>BASIC INTERACTIONS</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COMPARATIVE EVALUATIONS</subject><subject>Earth, ocean, space</subject><subject>ELECTROMAGNETIC INTERACTIONS</subject><subject>ELECTROMAGNETIC RADIATION</subject><subject>ELEMENTARY PARTICLES</subject><subject>Exact sciences and technology</subject><subject>FERMIONS</subject><subject>Fundamental aspects of astrophysics</subject><subject>Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations</subject><subject>GALAXIES</subject><subject>GALAXY NUCLEI</subject><subject>GAMMA RADIATION</subject><subject>INTERACTIONS</subject><subject>IONIZING RADIATIONS</subject><subject>LEPTONS</subject><subject>MEASURING INSTRUMENTS</subject><subject>MILKY WAY</subject><subject>POSITRONS</subject><subject>Radiation mechanisms, polarization</subject><subject>RADIATIONS</subject><subject>Space Radiation</subject><subject>SPECTROMETERS</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNo90E1LAzEQBuAgCtaqv8DDIuJtdbL5vilFq9DiwQ-8hWk2odE1WzbrwX_vtiuSw2SGh2F4CTmlcEVBy2sqJWWwRyZUMF1yJtQ-mQAALyVT74fkKOePbVsZMyE3z8tlUfveuz62qWhDUccQvrMv5tjgMHSFoLT49G8FphTXscEd7LCOu98xOQjYZH_yV6fk9f7uZfZQLp7mj7PbRekqBn2pZHAgOchVkLUG5xisjKhXVHATmDBQKw-q5ho0Ih-eo5Q5w6VCUCZ4NiXn494299FmF4eT165NabjcqkpQrqsBXY7IdW3OnQ9208Uv7H4sBbsNx47hDPBihBvMDpvQYXIx_2tptGB0y85GljCjTX2XLTVaD-FxaSr2CyupaPI</recordid><startdate>19880315</startdate><enddate>19880315</enddate><creator>Share, G. H.</creator><creator>Kinzer, R. L.</creator><creator>Kurfess, J. D.</creator><creator>Messina, D. C.</creator><creator>Purcell, W. R.</creator><general>University of Chicago Press</general><scope>CYE</scope><scope>CYI</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19880315</creationdate><title>SMM detection of diffuse Galactic 511 keV annihilation radiation</title><author>Share, G. H. ; Kinzer, R. L. ; Kurfess, J. D. ; Messina, D. C. ; Purcell, W. R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c230t-76fc06406bf6d80cc30b95db1549f3590d7e07d4808aa4a4ac113c9467a079fe3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>640105 - Astrophysics & Cosmology- Galaxies</topic><topic>ANNIHILATION</topic><topic>ANTILEPTONS</topic><topic>ANTIMATTER</topic><topic>ANTIPARTICLES</topic><topic>Astronomy</topic><topic>BASIC INTERACTIONS</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COMPARATIVE EVALUATIONS</topic><topic>Earth, ocean, space</topic><topic>ELECTROMAGNETIC INTERACTIONS</topic><topic>ELECTROMAGNETIC RADIATION</topic><topic>ELEMENTARY PARTICLES</topic><topic>Exact sciences and technology</topic><topic>FERMIONS</topic><topic>Fundamental aspects of astrophysics</topic><topic>Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations</topic><topic>GALAXIES</topic><topic>GALAXY NUCLEI</topic><topic>GAMMA RADIATION</topic><topic>INTERACTIONS</topic><topic>IONIZING RADIATIONS</topic><topic>LEPTONS</topic><topic>MEASURING INSTRUMENTS</topic><topic>MILKY WAY</topic><topic>POSITRONS</topic><topic>Radiation mechanisms, polarization</topic><topic>RADIATIONS</topic><topic>Space Radiation</topic><topic>SPECTROMETERS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Share, G. H.</creatorcontrib><creatorcontrib>Kinzer, R. L.</creatorcontrib><creatorcontrib>Kurfess, J. D.</creatorcontrib><creatorcontrib>Messina, D. C.</creatorcontrib><creatorcontrib>Purcell, W. R.</creatorcontrib><creatorcontrib>E. O. Hulburt Center for Space Research, Washington, DC (USA)</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>Share, G. H.</au><au>Kinzer, R. L.</au><au>Kurfess, J. D.</au><au>Messina, D. C.</au><au>Purcell, W. R.</au><aucorp>E. O. Hulburt Center for Space Research, Washington, DC (USA)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>SMM detection of diffuse Galactic 511 keV annihilation radiation</atitle><jtitle>Astrophys. J.; (United States)</jtitle><date>1988-03-15</date><risdate>1988</risdate><volume>326</volume><issue>2</issue><spage>717</spage><epage>732</epage><pages>717-732</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>Observations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of its properties used in the analysis are described, and the methods used for accumulating, fitting, and analyzing the data are outlined. It is shown how the Galactic 511 keV line was separated from the intense and variable background observed in orbit. The SMM observations are compared with previous measurements of annihilation radiation from the Galactic center region, and the astrophysical implications are discussed. It is argued that most of the measurements made to date suggest the presence of an extended Galactic source of annihilation radiation.</abstract><cop>Legacy CDMS</cop><pub>University of Chicago Press</pub><doi>10.1086/166130</doi><tpages>16</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-637X |
| ispartof | Astrophys. J.; (United States), 1988-03, Vol.326 (2), p.717-732 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_crossref_primary_10_1086_166130 |
| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | 640105 - Astrophysics & Cosmology- Galaxies ANNIHILATION ANTILEPTONS ANTIMATTER ANTIPARTICLES Astronomy BASIC INTERACTIONS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COMPARATIVE EVALUATIONS Earth, ocean, space ELECTROMAGNETIC INTERACTIONS ELECTROMAGNETIC RADIATION ELEMENTARY PARTICLES Exact sciences and technology FERMIONS Fundamental aspects of astrophysics Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations GALAXIES GALAXY NUCLEI GAMMA RADIATION INTERACTIONS IONIZING RADIATIONS LEPTONS MEASURING INSTRUMENTS MILKY WAY POSITRONS Radiation mechanisms, polarization RADIATIONS Space Radiation SPECTROMETERS |
| title | SMM detection of diffuse Galactic 511 keV annihilation radiation |
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