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arXiv 1208.0160astro-ph.HE
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在接近爱丁顿的光度下平流的影响:M31中的ULX

The effect of advection at luminosities close to Eddington: The ULX in M31

Odele Straub, Chris Done, Matthew J. Middleton

摘要:

仙女座星系中的瞬态超亮X射线源CXOM 31 J004253.1+411422很可能是一个10个太阳质量的黑洞,在其峰值时具有超爱丁顿光度。在下降期间拍摄的XMM-牛顿光谱则跟踪0.86-0.27 L_Edd的光度。这些光谱都是由一个热盘组成,它大致遵循一个恒定的内半径轨道的亮度和温度的来源下降。在最高光度的光盘结构应该改变由于平流辐射通过光盘。这种平流通量可以部分地释放在较低的半径,从而修改频谱形状。为了研究平流在接近爱丁顿光度的影响,我们采用了一个完全相对论性的薄盘模型,SLIMBH,其中包括平流冷却和完整的辐射转移通过光球的基础上TLUSTY。该模型还结合了相对论光子射线跟踪从光盘光球的适当位置,而不是中间平面的超薄光盘不再是几何薄。我们发现,这些新的模型仅略有不同,从非平流(标准)BHSPEC模型,即使在这里考虑的最高光度。虽然这两个光盘可以适应最高的光度数据,但都不是一个很好的适合 * 较低 * 光度。这可能表明在低光度盘中缺少一个物理过程,并且随着盘光度接近爱丁顿极限而消退。

英文摘要:

The transient, ultra-luminous X-ray source CXOM31 J004253.1+411422 in the Andromeda galaxy is most likely a 10 solar mass black hole, with super-Eddington luminosity at its peak. The XMM-Newton spectra taken during the decline then trace luminosities of 0.86-0.27 L_Edd. These spectra are all dominated by a hot disc component, which roughly follows a constant inner radius track in luminosity and temperature as the source declines. At the highest luminosity the disc structure should change due to advection of radiation through the disc. This advected flux can be partly released at lower radii thus modifying the spectral shape. To study the effect of advection at luminosities close to Eddington we employ a fully relativistic slim disc model, SLIMBH, that includes advective cooling and full radiative transfer through the photosphere based on TLUSTY. The model also incorporates relativistic photon ray-tracing from the proper location of the disc photosphere rather than the mid-plane as the slim disc is no longer geometrically thin. We find that these new models differ only slightly from the non-advective (standard) BHSPEC models even at the highest luminosities considered here. While both discs can fit the highest luminosity data, neither is a very good fit to the *lower* luminosities. This could indicate a missing physical process that acts in low luminosity discs and subsides as the disc luminosity approaches the Eddington limit.

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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