Gamma-ray emission from proton-proton interactions in hot accretion flows
Gamma-ray emission from proton-proton interactions in hot accretion flows
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热吸积流中质子-质子相互作用的伽马射线发射
DOI：
10.1093/mnras/stt573
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发表时间：
2013-04
影响因子：
4.8
通讯作者：
Stepnik, Agnieszka
中科院分区：
文献类型：
--
作者：
Niedzwiecki, Andrzej;Xie, Fu-Guo;Stepnik, Agnieszka
我们提出了一个模型的伽玛射线辐射通过中性π介子的生产和衰变的两个温度吸积流周围的超大质量黑洞。通过考虑（1）光子传输中的相对论效应和（2）流辐射场中γ射线光子的吸收，我们改进了以前对这种强子γ射线发射的研究。我们使用一个完全广义相对论的辐射和流体动力学过程的描述，这使我们能够研究的依赖于黑洞的自旋。自旋值强烈影响伽马射线发射率在近似10个引力半径。总光度L小于或接近爱丁顿光度（L-Edd）的10（-3）的流的中心区域对于能量低于10 GeV的光子大多是透明的，允许研究时空度规的影响。对于这样的L，伽马射线的观测上限（0.1-10 GeV）到X射线（2-10 keV）L0.1-10 GeV/L2-10 keV < 0.1的光度比可以排除黑洞的快速旋转;另一方面，L0.1-10 GeV/L2-10 keV的测量值与0.1相似，不能视为快速旋转的证据，这样的比率也可以由伽马射线发射率的平坦径向分布（这将在整个流体中的质子的非热加速时发生）产生。当L大于或近似于10（-2）L（Edd）时，来自最内部区域的伽马射线发射被强烈吸收，并且观察到的伽马射线不携带关于a值的信息。我们注意到，如果在半人马座A中观察到的X射线发射来自吸积流，那么来自吸积流的强子伽马射线发射应该对从该物体的核心观察到的MeV/GeV发射有显着贡献，除非它包含一个缓慢旋转的黑洞并且流中的质子是热的。
We present a model of gamma-ray emission through neutral pion production and decay in two-temperature accretion flows around supermassive black holes. We refine previous studies of such a hadronic gamma-ray emission by taking into account (1) relativistic effects in the photon transfer and (2) absorption of gamma-ray photons in the radiation field of the flow. We use a fully general relativistic description of both the radiative and hydrodynamic processes, which allows us to study the dependence on the black hole spin. The spin value strongly affects the gamma-ray emissivity within similar to 10 gravitational radii. The central regions of flows with the total luminosities L less than or similar to 10(- 3) of the Eddington luminosity (L-Edd) are mostly transparent to photons with energies below 10 GeV, permitting investigation of the effects of space-time metric. For such L, an observational upper limit on the gamma-ray (0.1-10 GeV) to X-ray (2-10 keV) luminosity ratio of L0.1-10 GeV/L2-10 keV < 0.1 can rule out rapid rotation of the black hole; on the other hand, a measurement of L0.1-10 GeV/L2-10 keV similar to 0.1 cannot be regarded as the evidence of rapid rotation, as such a ratio can also result from a flat radial profile of gamma-ray emissivity (which would occur for non-thermal acceleration of protons in the whole body of the flow). At L greater than or similar to 10(- 2)L(Edd), the gamma-ray emission from the innermost region is strongly absorbed and the observed gamma-rays do not carry information on the value of a. We note that if the X-ray emission observed in Centaurus A comes from an accretion flow, the hadronic gamma-ray emission from the flow should contribute significantly to the MeV/GeV emission observed from the core of this object, unless it contains a slowly rotating black hole and protons in the flow are thermal.
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影响因子：
6.5
作者：
B. B. A. C. A. M. G. Torino-B.-B.-A.-C.-A.-M.-G.-Torino-2000604574;I. Torino;Torino;Italy
通讯作者：
B. B. A. C. A. M. G. Torino-B.-B.-A.-C.-A.-M.-G.-Torino-2000604574;I. Torino;Torino;Italy
DOI：
10.1111/j.1365-2966.2005.09752.x
发表时间：
2005-07
影响因子：
4.8
作者：
A. Niedźwiecki;A. Zdziarski
通讯作者：
A. Niedźwiecki;A. Zdziarski
DOI：
10.1088/0004-637x/692/1/411
发表时间：
2008-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
S. Noble;J. Krolik;J. Hawley
通讯作者：
S. Noble;J. Krolik;J. Hawley
DOI：
10.1111/j.1365-2966.2012.22030.x
发表时间：
2012-07
影响因子：
4.8
作者：
Xie, Fu-Guo;Yuan, Feng
通讯作者：
Yuan, Feng
热吸积流内部区域整体康普顿冷却的蒙特卡洛模拟
DOI：
10.1111/j.1365-2966.2009.16135.x
发表时间：
2009-09
影响因子：
4.8
作者：
Niedzwiecki, Andrzej;Yuan, Feng;Zdziarski, Andrzej A.;Xie, Fu-Guo
通讯作者：
Xie, Fu-Guo