Observations of NGC 4151 at 2 keV to 2 MeV from HEAO 1
Broad-range X-ray and gamma-ray spectra of the Seyfert galaxy NGC 4151 obtained by the UCSD/MIT and GSFC/CIT detectors of HEAO 1 are presented. For two out of the three observational epochs the best-fit model is a power law with photon index 1.6 + or - 0.1 in the 2 keV-2 MeV spectral range. The thir...
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| Veröffentlicht in: | The Astrophysical journal 1984-04, Vol.279 (2), p.555-562 |
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| container_end_page | 562 |
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| container_issue | 2 |
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| container_title | The Astrophysical journal |
| container_volume | 279 |
| creator | Baity, W. A. Worrall, D. M. Rothschild, R. E. Mushotzky, R. F. Tennant, A. F. Primini, F. A. |
| description | Broad-range X-ray and gamma-ray spectra of the Seyfert galaxy NGC 4151 obtained by the UCSD/MIT and GSFC/CIT detectors of HEAO 1 are presented. For two out of the three observational epochs the best-fit model is a power law with photon index 1.6 + or - 0.1 in the 2 keV-2 MeV spectral range. The third observation, in June, 1978, when the intensity was a factor of 2 higher, requires a change above 50 keV from a similar power law to a steeper power law or an exponential. Through comparisons with previous observations, a weak correlation is found between the high-energy spectral index and the flux level. Comparison of these data and other X-ray and gamma-ray observations with the spectra expected from several possible emission mechanisms supports a synchrotron-self-Compton model using infrared target photons or a Compton-scattering process involving X-rays of less than 10 keV energies. |
| doi_str_mv | 10.1086/161920 |
| format | Article |
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A.</creatorcontrib><title>Observations of NGC 4151 at 2 keV to 2 MeV from HEAO 1</title><title>The Astrophysical journal</title><description>Broad-range X-ray and gamma-ray spectra of the Seyfert galaxy NGC 4151 obtained by the UCSD/MIT and GSFC/CIT detectors of HEAO 1 are presented. For two out of the three observational epochs the best-fit model is a power law with photon index 1.6 + or - 0.1 in the 2 keV-2 MeV spectral range. The third observation, in June, 1978, when the intensity was a factor of 2 higher, requires a change above 50 keV from a similar power law to a steeper power law or an exponential. Through comparisons with previous observations, a weak correlation is found between the high-energy spectral index and the flux level. Comparison of these data and other X-ray and gamma-ray observations with the spectra expected from several possible emission mechanisms supports a synchrotron-self-Compton model using infrared target photons or a Compton-scattering process involving X-rays of less than 10 keV energies.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Quasars. Active or peculiar galaxies, objects, and systems</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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The universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Baity, W. A.</creatorcontrib><creatorcontrib>Worrall, D. M.</creatorcontrib><creatorcontrib>Rothschild, R. E.</creatorcontrib><creatorcontrib>Mushotzky, R. F.</creatorcontrib><creatorcontrib>Tennant, A. F.</creatorcontrib><creatorcontrib>Primini, F. A.</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Baity, W. A.</au><au>Worrall, D. M.</au><au>Rothschild, R. E.</au><au>Mushotzky, R. F.</au><au>Tennant, A. F.</au><au>Primini, F. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observations of NGC 4151 at 2 keV to 2 MeV from HEAO 1</atitle><jtitle>The Astrophysical journal</jtitle><date>1984-04-15</date><risdate>1984</risdate><volume>279</volume><issue>2</issue><spage>555</spage><epage>562</epage><pages>555-562</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>Broad-range X-ray and gamma-ray spectra of the Seyfert galaxy NGC 4151 obtained by the UCSD/MIT and GSFC/CIT detectors of HEAO 1 are presented. For two out of the three observational epochs the best-fit model is a power law with photon index 1.6 + or - 0.1 in the 2 keV-2 MeV spectral range. The third observation, in June, 1978, when the intensity was a factor of 2 higher, requires a change above 50 keV from a similar power law to a steeper power law or an exponential. Through comparisons with previous observations, a weak correlation is found between the high-energy spectral index and the flux level. Comparison of these data and other X-ray and gamma-ray observations with the spectra expected from several possible emission mechanisms supports a synchrotron-self-Compton model using infrared target photons or a Compton-scattering process involving X-rays of less than 10 keV energies.</abstract><cop>Legacy CDMS</cop><pub>University of Chicago Press</pub><doi>10.1086/161920</doi><tpages>8</tpages></addata></record> |
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| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Quasars. Active or peculiar galaxies, objects, and systems Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | Observations of NGC 4151 at 2 keV to 2 MeV from HEAO 1 |
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