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Rossi X-ray Timing Explorer Observations of the Low-mass X-ray Binary 4U 1608 -522 in the Upper-banana State

https://hiroshima.repo.nii.ac.jp/records/2006338
https://hiroshima.repo.nii.ac.jp/records/2006338
edc793d6-19e6-4358-8a69-e324dd8e3723
名前 / ファイル ライセンス アクション
AstrophysJ_738_62.pdf AstrophysJ_738_62.pdf (1.0 MB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル Rossi X-ray Timing Explorer Observations of the Low-mass X-ray Binary 4U 1608 -522 in the Upper-banana State
言語 en
作成者 Takahashi, Hiromitsu

× Takahashi, Hiromitsu

en Takahashi, Hiromitsu

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Sakurai, Soki

× Sakurai, Soki

en Sakurai, Soki

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Makishima, Kazuo

× Makishima, Kazuo

en Makishima, Kazuo

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
権利情報 (c) 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
主題
主題Scheme Other
主題 binaries: general
主題
主題Scheme Other
主題 stars: individual (4U 1608-522)
主題
主題Scheme Other
主題 stars: neutron
主題
主題Scheme Other
主題 X-rays: stars
主題
主題Scheme NDC
主題 440
内容記述
内容記述 To investigate the physics of mass accretion onto weakly magnetized neutron stars (NSs), 95 archival Rossi X-Ray Timing Explorer data sets of an atoll source 4U 1608-522, acquired over 1996-2004 in the so-called upper-banana state, were analyzed. The object meantime exhibited 3-30 keV luminosity in the range of less than or similar to 10(35)-4 x 10(37) erg s(-1), assuming a distance of 3.6 kpc. The 3-30 keV Proportional Counter Array spectra, produced one from each data set, were represented successfully with a combination of a soft and a hard component, the presence of which was revealed in a model-independent manner by studying spectral variations among the observations. The soft component is expressed by the so-called multi-color disk model with a temperature of similar to 1.8 keV, and is attributed to the emission from an optically thick standard accretion disk. The hard component is a blackbody (BB) emission with a temperature of similar to 2.7 keV, thought to be emitted from the NS surface. As the total luminosity increases, a continuous decrease is observed in the ratio of the BB luminosity to that of the disk component. This property suggests that it gradually becomes difficult for the matter flowing through the accretion disk to reach the NS surface, presumably forming outflows driven by the increased radiation pressure. On timescales of hours to days, the overall source variability was found to be controlled by two independent variables: the mass accretion rate and the innermost disk radius, which changes both physically and artificially.
言語 en
出版者
出版者 IOP science
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
関連情報
識別子タイプ DOI
関連識別子 10.1088/0004-637X/738/1/62
関連情報
識別子タイプ DOI
関連識別子 http://dx.doi.org/10.1088/0004-637X/738/1/62
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0004-637X
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AA00553242
開始ページ
開始ページ 62
書誌情報 Astrophysical Journal
Astrophysical Journal

巻 738, 号 1, p. 62, 発行日 2011
旧ID 34756
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