Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL
We have fitted ∼200 RXTE and INTEGRAL spectra of the neutron star (NS) low-mass X-ray binary (LMXB) GX 9+9 from 2002 to 2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL), i.e. an extended accretion zone on the NS surface as opposed to the mo...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2009, Vol.393 (2), p.569-578 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Savolainen, P. Hannikainen, D. C. Vilhu, O. Paizis, A. Nevalainen, J. Hakala, P. |
| description | We have fitted ∼200 RXTE and INTEGRAL spectra of the neutron star (NS) low-mass X-ray binary (LMXB) GX 9+9 from 2002 to 2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL), i.e. an extended accretion zone on the NS surface as opposed to the more traditional disc-like boundary layer. Contrary to theory, the SL temperature was seen to increase towards low SL luminosities, while the approximate angular extent had a nearly linear luminosity dependency. Comptonization was not required to adequately fit these spectra. Together with the ∼ 70° upper bound of inclination implied by the lack of eclipses, the best-fitting normalization of the accretion disc blackbody component implies a distance of ∼10 kpc, instead of the usually quoted 5 kpc. |
| doi_str_mv | 10.1111/j.1365-2966.2008.14201.x |
| format | Article |
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C. ; Vilhu, O. ; Paizis, A. ; Nevalainen, J. ; Hakala, P.</creator><creatorcontrib>Savolainen, P. ; Hannikainen, D. C. ; Vilhu, O. ; Paizis, A. ; Nevalainen, J. ; Hakala, P.</creatorcontrib><description>We have fitted ∼200 RXTE and INTEGRAL spectra of the neutron star (NS) low-mass X-ray binary (LMXB) GX 9+9 from 2002 to 2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL), i.e. an extended accretion zone on the NS surface as opposed to the more traditional disc-like boundary layer. Contrary to theory, the SL temperature was seen to increase towards low SL luminosities, while the approximate angular extent had a nearly linear luminosity dependency. Comptonization was not required to adequately fit these spectra. 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Comptonization was not required to adequately fit these spectra. Together with the ∼ 70° upper bound of inclination implied by the lack of eclipses, the best-fitting normalization of the accretion disc blackbody component implies a distance of ∼10 kpc, instead of the usually quoted 5 kpc.</description><subject>accretion</subject><subject>accretion discs</subject><subject>accretion, accretion discs</subject><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Double stars</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>stars: individual: GX 9+9</subject><subject>Theory</subject><subject>X-rays: binaries</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqNkE1v0zAchy0EEqXjO1hIcEHJ_n6NcwFNpWsnhSGqHioulmc7kJIlwW5E--1JlqkHBNJ88Evy_B7ZP4QwgZQM43KfEiZFQnMpUwqgUsIpkPT4DM3OP56jGQATicoIeYlexbgHAM6onKGPy2NXt6FqvuPDD49jF7xx46k2Jx9wW-LVDufvc9zH8etmt11i0zh8c7tdrjZXxQV6UZo6-teP6xxtr5fbxTopvqxuFldFYgURJOFg6Z2idyX3OWRlJqyjShrlMme8o5w55cHn3ljInDcmo04qBYI6Ia2zbI7eTdoutL96Hw_6vorW17VpfNtHTYEDJYI-AQRJ8hwG8M1f4L7tQzO8YWAyxrka5jlSE2RDG2Pwpe5CdW_CSRPQY_16r8eW9djy6Fb6oX59HKJvH_0mWlOXwTS2iuc8JYQpTuXAfZi431XtT0_268-3m4ftIGCToO27_8STf10vmVJVPPjjOWfCTy0zlgm93n3TxeLrp3VxnWvO_gCUcrMd</recordid><startdate>2009</startdate><enddate>2009</enddate><creator>Savolainen, P.</creator><creator>Hannikainen, D. 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C.</creatorcontrib><creatorcontrib>Vilhu, O.</creatorcontrib><creatorcontrib>Paizis, A.</creatorcontrib><creatorcontrib>Nevalainen, J.</creatorcontrib><creatorcontrib>Hakala, P.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Savolainen, P.</au><au>Hannikainen, D. C.</au><au>Vilhu, O.</au><au>Paizis, A.</au><au>Nevalainen, J.</au><au>Hakala, P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Monthly Notices of the Royal Astronomical Society</stitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><date>2009</date><risdate>2009</risdate><volume>393</volume><issue>2</issue><spage>569</spage><epage>578</epage><pages>569-578</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>We have fitted ∼200 RXTE and INTEGRAL spectra of the neutron star (NS) low-mass X-ray binary (LMXB) GX 9+9 from 2002 to 2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL), i.e. an extended accretion zone on the NS surface as opposed to the more traditional disc-like boundary layer. Contrary to theory, the SL temperature was seen to increase towards low SL luminosities, while the approximate angular extent had a nearly linear luminosity dependency. Comptonization was not required to adequately fit these spectra. Together with the ∼ 70° upper bound of inclination implied by the lack of eclipses, the best-fitting normalization of the accretion disc blackbody component implies a distance of ∼10 kpc, instead of the usually quoted 5 kpc.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1365-2966.2008.14201.x</doi><tpages>10</tpages></addata></record> |
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| subjects | accretion accretion discs accretion, accretion discs Astronomy Astrophysics Double stars Earth, ocean, space Exact sciences and technology stars: individual: GX 9+9 Theory X-rays: binaries |
| title | Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL |
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