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arXiv 1104.2614astro-ph.HE
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ESO 243-49 HLX-1中的冷吸积盘:中等质量黑洞的进一步证据

The Cool Accretion Disk in ESO 243-49 HLX-1: Further Evidence of an Intermediate Mass Black Hole

Shane W. Davis, Ramesh Narayan, Yucong Zhu, Didier Barret, Sean A. Farrell, Olivier Godet, Mathieu Servillat, Natalie A. Webb

摘要:

ESO 243-49中的HLX-1的辐射热光度超过10^42 erg/s,是超亮X射线源中最明亮的,也是中等质量黑洞存在的最有力证据之一。我们得到了很好的拟合盘占主导地位的观测源与BHSPEC,一个完全相对论性的黑洞吸积盘光谱模型。由于缺乏对倾角和黑洞自旋的独立约束,模型中出现了简并,因此最佳拟合的黑洞质量M存在100倍的不确定性。然而,XMM-牛顿观测的光谱拟合提供了可靠的下限和上限,即3000 Msun < M < 3 x 10^5 Msun,置信度为90%,将HLX-1牢牢地置于中等质量区域。M的下限完全由匹配光谱中热分量的形状和峰值能量来确定。这个界限与仅基于爱丁顿极限的论点一致(但独立于)。XMM-牛顿数据与更明亮的斯威夫特和钱德拉观测的联合光谱建模将下限提高到6000 Msun,但这种更严格的约束并不独立于爱丁顿极限。M的上限对最大允许倾角i很敏感,如果我们限制i < 75度,则M的上限会降低到M < 10^5 Msun。

英文摘要:

With an inferred bolometric luminosity exceeding 10^42 erg/s, HLX-1 in ESO 243-49 is the most luminous of ultraluminous X-ray sources and provides one of the strongest cases for the existence of intermediate mass black holes. We obtain good fits to disk-dominated observations of the source with BHSPEC, a fully relativistic black hole accretion disk spectral model. Due to degeneracies in the model arising from the lack of independent constraints on inclination and black hole spin, there is a factor of 100 uncertainty in the best-fit black hole mass M. Nevertheless, spectral fitting of XMM-Newton observations provides robust lower and upper limits with 3000 Msun < M < 3 x 10^5 Msun, at 90% confidence, placing HLX-1 firmly in the intermediate-mass regime. The lower bound on M is entirely determined by matching the shape and peak energy of the thermal component in the spectrum. This bound is consistent with (but independent of) arguments based solely on the Eddington limit. Joint spectral modelling of the XMM-Newton data with more luminous Swift and Chandra observations increases the lower bound to 6000 Msun, but this tighter constraint is not independent of the Eddington limit. The upper bound on M is sensitive to the maximum allowed inclination i, and is reduced to M < 10^5 Msun if we limit i < 75 deg.

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