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arXiv 1011.5366astro-ph.HE
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黑洞吸积盘中热辐射引起的Angular momentum输运

Angular momentum transport by thermal emission in black hole accretion disks

Jarrett L. Johnson

摘要:

我们计算的角动量,热光子进行的粘性黑洞吸积盘,由于强多普勒频移赋予他们的高轨道速度的辐射盘材料。虽然辐射的发射本身不能驱动吸积,但我们发现它确实会导致特定角动量的损失,从而导致粘性驱动的吸积流。特别是,我们表明,在一个标准的,多色盘在半径r的热辐射损失的角动量的分数是~ 0.4 r_s/r,其中r_s是史瓦西半径的黑洞。我们简要地强调了这种效应和密切相关的坡印廷-罗伯逊效应之间的关键相似之处。

英文摘要:

We calculate the amount of angular momentum that thermal photons carry out of a viscous black hole accretion disc, due to the strong Doppler shift imparted to them by the high orbital velocity of the radiating disc material. While the emission of radiation can not drive accretion on its own, we find that it does result in a loss of specific angular momentum, thereby contributing to an otherwise viscosity-driven accretion flow. In particular, we show that the fraction of the angular momentum that is lost to thermal emission at a radius r in a standard, multi-color disc is ~ 0.4r_s/r, where r_s is the Schwarzschild radius of the black hole. We briefly highlight the key similarities between this effect and the closely related Poynting-Robertson effect.

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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