Gamma-ray emission from proton-proton interactions in hot accretion flows
文献类型：期刊论文
| 作者 | Niedzwiecki, Andrzej1; Xie, Fu-Guo2,3; Stepnik, Agnieszka1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-06-01 |
| 卷号 | 432期号:2页码:1576-1586 |
| 关键词 | accretion black hole physics gamma-rays: galaxies accretion discs |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; SUPERMASSIVE BLACK-HOLE ; ACTIVE GALACTIC NUCLEI ; SGR A-ASTERISK ; RELATIVISTIC THERMAL PLASMAS ; SAGITTARIUS-A ; MAGNETOHYDRODYNAMIC SIMULATIONS ; RADIATIVE EFFICIENCY ; MAGNETIC-FIELD ; RADIO GALAXIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000319832300055 |
| 源URL | [http://119.78.226.72/handle/331011/18058]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Lodz, Dept Astrophys, PL-90236 Lodz, Poland 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Niedzwiecki, Andrzej,Xie, Fu-Guo,Stepnik, Agnieszka. Gamma-ray emission from proton-proton interactions in hot accretion flows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,432(2):1576-1586. |
| APA | Niedzwiecki, Andrzej,Xie, Fu-Guo,&Stepnik, Agnieszka.(2013).Gamma-ray emission from proton-proton interactions in hot accretion flows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,432(2),1576-1586. |
| MLA | Niedzwiecki, Andrzej,et al."Gamma-ray emission from proton-proton interactions in hot accretion flows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 432.2(2013):1576-1586. |
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来源：上海天文台
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