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arXiv 1201.4172astro-ph.HE
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黑洞软态中无处不在的赤道吸积盘风

Ubiquitous equatorial accretion disc winds in black hole soft states

G. Ponti, R. P. Fender, M. C. Begelman, R. J. H. Dunn, J. Neilsen, M. Coriat

摘要:

银河系黑洞(GBH)的高分辨率光谱揭示了高度电离吸收体的存在。在一个GBH中,吸积接近爱丁顿极限超过十年,观察到一个强大的吸积盘风存在于较软的X射线状态中,并且有人认为它可以带走足够的质量和能量来熄灭无线电喷流。在这里,我们报告说,这些风,这可能有质量流出率的顺序内吸积率或更高,是一个无处不在的组成部分,所有GBH的无喷流软状态。我们还证明,这些风有一个赤道几何与几十度的开放角度,所以只观察到在源中,光盘是倾斜在一个大角度的视线。Fe XXV / Fe XXVI线比随康普顿温度的降低,在软状态下观察到,表明更高的风电离和更硬的光谱形状之间的联系。虽然风、吸积流和喷流之间的物理相互作用还没有完全被理解,但这些风的质量通量和功率,以及它们在软X射线状态期间的普遍存在,表明它们是吸积现象的基本组成部分。

英文摘要:

High resolution spectra of Galactic Black Holes (GBH) reveal the presence of highly ionised absorbers. In one GBH, accreting close to the Eddington limit for more than a decade, a powerful accretion disc wind is observed to be present in softer X-ray states and it has been suggested that it can carry away enough mass and energy to quench the radio jet. Here we report that these winds, which may have mass outflow rates of the order of the inner accretion rate or higher, are an ubiquitous component of the jet-free soft states of all GBH. We furthermore demonstrate that these winds have an equatorial geometry with opening angles of few tens of degrees, and so are only observed in sources in which the disc is inclined at a large angle to the line of sight. The decrease in Fe XXV / Fe XXVI line ratio with Compton temperature, observed in the soft state, suggests a link between higher wind ionisation and harder spectral shapes. Although the physical interaction between the wind, accretion flow and jet is still not fully understood, the mass flux and power of these winds, and their presence ubiquitously during the soft X-ray states suggests they are fundamental components of the accretion phenomenon.

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