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arXiv 1012.4689astro-ph.GA
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关于SS 433的环双星盘的更多信息

More on the circumbinary disk of SS 433

M. G. Bowler

摘要:

银河系微类星体SS 433光谱中的某些谱线,特别是明亮的H α谱线,被解释为环双星盘的辐射。在这种解释中,发光物质的轨道速度超过200 km/s,双星系统的质量超过40个太阳质量。一个非常简单的圆盘材料激发模型与观测结果非常吻合,但环双星圆盘的存在似乎是有争议的。发表的光谱,采取几乎每晚超过两个轨道周期的二元系统,显示H α和他我线,这些被分析为叠加的高斯分量。一个模型中,任何给定的补丁的假定的环双星材料的激励是成正比的,其瞬时距离的平方反比的紧凑的对象被构造和观测比较。新的模型提供了一个很好的描述的意见。给出了H α和He I谱随轨道相位变化的定量描述,条件是发射环的半径不大于最近的稳定环双星轨道的半径。新的分析大大加强了环绕SS 433系统的速度超过200 km/s的环双星盘的情况,并提出了假设的替代解释,但存在重大困难。如果环双星盘的假设基本上是正确的,那么双星系统的质量必须超过40个太阳质量,致密的物体必须是一个相当大的黑洞。这种可能性非常大,应该认真对待。

英文摘要:

Certain lines in spectra of the Galactic microquasar SS 433, in particular the brilliant H alpha line, have been interpreted as emission from a circumbinary disk. In this interpretation the orbital speed of the glowing material is in excess of 200 km/s and the mass of the binary system in excess of 40 solar masses. A very simple model of excitation of disk material is in remarkable agreement with the observations, yet it seems that the very existence of a circumbinary disk is regarded as controversial. Published spectra, taken almost nightly over two orbital periods of the binary system, show H alpha and He I lines; these were analysed as superpositions of Gaussian components. A model in which the excitation of any given patch of putative circumbinary material is proportional to the inverse square of its instantaneous distance from the compact object was constructed and compared with observations. The new model provides an excellent description of the observations. The variation of the H alpha and He I spectra with orbital phase are described quantitatively provided the radius of the emitting ring is not much greater than the radius of the closest stable circumbinary orbit. The new analysis has greatly strengthened the case for a circumbinary disk orbiting the SS 433 system with a speed of over 200 km/s and presents supposed alternative explanations with major difficulties. If the circumbinary disk scenario is essentially correct, the mass of the binary system must exceed 40 solar masses and the compact object must be a rather massive black hole. The case is so strong that this possibility should be taken seriously.

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