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arXiv 0904.3419astro-ph.HE
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从INTEGRAL观测分析SS433的硬X射线食

Analysis of hard X-ray eclipse in SS433 from INTEGRAL observations

A. M. Cherepashchuk, R. A. Sunyaev, K. A. Postnov, E. A. Antokhina, S. V. Molkov

摘要:

利用2003-2008年超吸积星系微类星体SS 433的硬X射线积分观测资料,分析了其在最大星盘张角源岁差位相的观测结果。据发现,主要的X射线日食的形状和宽度是强烈的变化,这表明在致密的恒星风和气体流出的光学A7 I-组件和风碰撞区域的额外吸收。观测到的硬X射线谱与吸积盘进动相位的独立性表明,硬X射线发射(20-100 keV)是在一个扩展的,热的,准等温日冕,可能加热的相互作用的相对论性喷流与不均匀的风流出旋进超临界吸积盘。通过几何模型对INTEGRAL揭示的SS 433的X射线食变和岁差硬X射线变的联合建模表明了二元质量比$q=m_x/m_v\simeq 0.25÷0.5$。在$q\simeq 0.3$达到联合轨道和岁差$χ^2$残差的绝对最小值。发现的二进制质量比范围,使我们能够解释的最小亮度在中间的主要光学日食的实质性岁差变化。对于从Hillwig & Gies数据导出的光学星$f_v=0.268 M_\odot$的质量函数,获得的$q\simeq 0.3$值产生了组成部分$m_x\simeq 5.3 M_\odot$,$m_v\simeq 17.7 M_\odot$的质量,证实了SS 433中致密物体的黑洞性质。

英文摘要:

The analysis of hard X-ray INTEGRAL observations (2003-2008) of superaccreting galactic microquasar SS433 at precessional phases of the source with the maximum disk opening angle is carried out. It is found that the shape and width of the primary X-ray eclipse is strongly variable suggesting additional absorption in dense stellar wind and gas outflows from the optical A7I-component and the wind-wind collision region. The independence of the observed hard X-ray spectrum on the accretion disk precessional phase suggests that hard X-ray emission (20-100 keV) is formed in an extended, hot, quasi-isothermal corona, probably heated by interaction of relativistic jet with inhomogeneous wind outflow from the precessing supercritical accretion disk. A joint modeling of X-ray eclipsing and precessional hard X-ray variability of SS433 revealed by INTEGRAL by a geometrical model suggests the binary mass ratio $q=m_x/m_v\simeq 0.25÷0.5$. The absolute minimum of joint orbital and precessional $χ^2$ residuals is reached at $q\simeq 0.3$. The found binary mass ratio range allows us to explain the substantial precessional variability of the minimum brightness at the middle of the primary optical eclipse. For the mass function of the optical star $f_v=0.268 M_\odot$ as derived from Hillwig & Gies data, the obtained value of $q\simeq 0.3$ yields the masses of the components $m_x\simeq 5.3 M_\odot$, $m_v\simeq 17.7 M_\odot$, confirming the black hole nature of the compact object in SS433.

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