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arXiv 1209.2880astro-ph.HEastro-ph.GA
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用INTEGRAL卫星对黑洞双星的高能观测

High-energy observations of black hole binaries with the INTEGRAL satellite

Melania Del Santo

摘要:

黑洞双星是研究致密天体吸积的重要资料来源。在X/伽马射线域,这些物体显示出几个复杂的光谱行为和过渡。根据八年来的INTEGRAL观测,我们对黑洞双星的高能辐射有了新的认识。一个额外的组件超过200千电子伏已被观察到在一些系统中,在硬/中间或低/硬状态。这种硬尾的性质仍然存在争议,在软态中观察到的也是如此。然而,在许多模型中,它通常归因于热康普顿等离子体中存在一小部分非热电子。本文回顾了黑洞双星系统的高能辐射,并报道了对三个不同天体1 E 1740.7-2942、GX 339-4、Cyg X-1的积分观测。

英文摘要:

Black-hole binaries are important sources through which studying accretion onto compact objects. In the X/gamma-ray domain, these objects show several and complex spectral behaviours and transitions. Based on INTEGRAL observations collected during the last eightyears, we have now a new view on the high energy emission of black-hole binary. An additional component above 200 keV has been observed in a few systems, during either hard/intermediate or low/hard states. The nature of this hard-tail is still debated, as also the one observed in soft states. However, among a number of models, it is usually attributed to the presence of a small fraction of non-thermal electrons in a hot-Comptonising plasma. I review the high energy emission from black hole binary systems and report on some INTEGRAL observations of three different objects: 1E 1740.7-2942, GX 339-4, Cyg X-1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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