SWIFT OBSERVATIONS OF THE ULTRALUMINOUS X-RAY SOURCE HOLMBERG IX X-1
SWIFT OBSERVATIONS OF THE ULTRALUMINOUS X-RAY SOURCE HOLMBERG IX X-1
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DOI：
10.1088/0004-637x/722/2/1816
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
A. Kong;Y. Yang;T.-C. Yen;H. Feng;P. Kaaret
中科院分区：
文献类型：
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作者：
A. Kong;Y. Yang;T.-C. Yen;H. Feng;P. Kaaret
Holmberg IX X-1 是著名的超发光 X 射线源，其 X 射线光度为 ∼1040 erg s−1。斯威夫特X射线望远镜定期监测该源。自2009年4月以来，光源一直处于长时间的低光度状态。我们利用在不同光度状态下采集的共同添加光谱来研究光源的光谱行为。简单的幂律和多色盘黑体模型可以被排除。然而，最好的整体配合是由具有冷黑体和热盘黑体的双热模型提供的。这表明 Holmberg IX X-1 可能是一个以爱丁顿极限以上七倍吸积的 10 M☉ 黑洞，或者是一个以爱丁顿极限以上 7 倍吸积的 100 M☉ 最大旋转黑洞，并且我们正在观察吸积盘的内部区域和致密天体的流出物。
Holmberg IX X-1 is a well-known ultraluminous X-ray source with an X-ray luminosity of ∼1040 erg s−1. The source has been monitored by the X-ray telescope of Swift regularly. Since 2009 April, the source has been in an extended low luminosity state. We utilize the co-added spectra taken at different luminosity states to study the spectral behavior of the source. Simple power-law and multi-color disk blackbody models can be ruled out. The best overall fits, however, are provided by a dual thermal model with a cool blackbody and a warm disk blackbody. This suggests that Holmberg IX X-1 may be a 10 M☉ black hole accreting at seven times above the Eddington limit or a 100 M☉ maximally rotating black hole accreting at the Eddington limit, and we are observing both the inner regions of the accretion disk and outflows from the compact object.