The gamma-ray emitting region of the jet in Cyg X-3
文献类型：期刊论文
| 作者 | Zdziarski, Andrzej A.1; Sikora, Marek1; Dubus, Guillaume2; Yuan, Feng3 ; Cerutti, Benoit4; Ogorzalek, Anna5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2012-04-01 |
| 卷号 | 421期号:4页码:2956-2968 |
| 关键词 | acceleration of particles accretion radiation mechanisms: non-thermal stars: individual: Cyg X-3 X-rays: binaries gamma-rays: theory accretion discs |
| 英文摘要 | We study models of the ?-ray emission of Cyg X-3 observed by Fermi. We calculate the average X-ray spectrum during the ?-ray active periods. Then, we calculate spectra from Compton scattering of a photon beam into a given direction by isotropic relativistic electrons with a power-law distribution, both based on the KleinNishina cross-section and in the Thomson limit. Applying the results to scattering of stellar blackbody radiation in the inner jet of Cyg X-3, we find that a low-energy break in the electron distribution at a Lorentz factor of similar to 300103 is required by the shape of the observed X-ray/?-ray spectrum in order to avoid overproducing the observed X-ray flux. The electrons giving rise to the observed ?-rays are efficiently cooled by Compton scattering, and the power-law index of the acceleration process is ?2.53. The bulk Lorentz factor of the jet and the kinetic power before the dissipation region depend on the fraction of the dissipation power supplied to the electrons; if it is ?1/2, the Lorentz factor is similar to 2.5, and the kinetic power is similar to 1038 erg s-1, which represents a firm lower limit on the jet power, and is comparable to the bolometric luminosity of Cyg X-3. Most of the power supplied to the electrons is radiated. The broad-band spectrum constrains the synchrotron and self-Compton emission from the ?-ray emitting electrons, which requires the magnetic field to be relatively weak, with the magnetic energy density ? a few times 10-3 of that in the electrons. The actual value of the magnetic field strength can be inferred from a future simultaneous measurement of the infrared and ?-ray fluxes. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | X-RAY ; COMPTON-SCATTERING ; PARTICLE-ACCELERATION ; RELATIVISTIC JET ; ASTROPHYSICAL SHOCKS ; NONTHERMAL SOURCES ; TIMING EXPLORER ; FERMI BLAZARS ; RADIO GALAXY ; CYGNUS-X-3 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000302620700021 |
| 公开日期 | 2015-01-27 |
| 源URL | [http://119.78.226.72//handle/331011/15468]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Ctr Astron M Kopernika, PL-00716 Warsaw, Poland 2.UJF Grenoble 1, CNRS INSU, Inst Planetol & Astrophys Grenoble, UMR 5274, F-38041 Grenoble, France 3.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Colorado, Dept Phys, Ctr Integrated Plasma Studies, Boulder, CO 80309 USA 5.Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland |
| 推荐引用方式 GB/T 7714 | Zdziarski, Andrzej A.,Sikora, Marek,Dubus, Guillaume,et al. The gamma-ray emitting region of the jet in Cyg X-3[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,421(4):2956-2968. |
| APA | Zdziarski, Andrzej A.,Sikora, Marek,Dubus, Guillaume,Yuan, Feng,Cerutti, Benoit,&Ogorzalek, Anna.(2012).The gamma-ray emitting region of the jet in Cyg X-3.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,421(4),2956-2968. |
| MLA | Zdziarski, Andrzej A.,et al."The gamma-ray emitting region of the jet in Cyg X-3".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421.4(2012):2956-2968. |
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来源：上海天文台
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