EVIDENCE FOR RAPIDLY ROTATING BLACK HOLES IN FANAROFF-RILEY I RADIO GALAXIES
文献类型：期刊论文
| 作者 | Wu, Qingwen1; Cao, Xinwu2 ; Wang, Ding-Xiong1
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-07-01 |
| 卷号 | 735期号:1页码:1 |
| 关键词 | accretion black hole physics galaxies: jets magnetohydrodynamics (MHD) X-rays: galaxies accretion disks |
| 英文摘要 | We investigate the correlation between 151 MHz radio luminosity, L-151 (MHz), and jet power, P-jet, for a sample of low-power radio galaxies, of which the jet power is estimated from X-ray cavities. The jet power for a sample of Fanaroff-Riley I radio galaxies (FR Is) is estimated with the derived empirical correlation. We find that P-jet/L-Edd is positively correlated with L-X(2-10) (KeV)/L-Edd for FR Is, where L-Edd is the Eddington luminosity and L-X(2-10) (KeV) is the 2-10 keV X-ray luminosity. We calculate the jet power of a hybrid model, as a variant of a Blandford-Znajek model proposed by Meier, based on the global solution of the advection-dominated accretion flow (ADAF) surrounding a Kerr black hole (BH). Our model calculations suggest that the maximal jet power is a function of the mass accretion rate and the BH spin parameter j. The hard X-ray emission is believed to be mainly from the ADAFs in FR Is, and the mass accretion rate is therefore constrained with the X-ray emission in our ADAF model calculations. We find that the dimensionless angular momentum of BH j greater than or similar to 0.9 is required in order to reproduce the observed relation of P-jet/L-Edd-L-X(2-10 keV)/L-Edd for FR Is. Our conclusion will be strengthened if part of the X-ray emission is contributed by the jets. Our results suggest that BHs in FR Is are rapidly spinning, which are almost not affected by the uncertainty of the BH mass estimates. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; MAGNETICALLY DRIVEN ACCRETION ; ADVECTION-DOMINATED ACCRETION ; X-RAY-EMISSION ; JET POWER ; FR-I ; RADIATIVE EFFICIENCY ; CHANDRA OBSERVATIONS ; ELLIPTIC GALAXIES ; FLOWS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000291788300050 |
| 源URL | [http://119.78.226.72/handle/331011/26374]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Qingwen,Cao, Xinwu,Wang, Ding-Xiong. EVIDENCE FOR RAPIDLY ROTATING BLACK HOLES IN FANAROFF-RILEY I RADIO GALAXIES[J]. ASTROPHYSICAL JOURNAL,2011,735(1):1. |
| APA | Wu, Qingwen,Cao, Xinwu,&Wang, Ding-Xiong.(2011).EVIDENCE FOR RAPIDLY ROTATING BLACK HOLES IN FANAROFF-RILEY I RADIO GALAXIES.ASTROPHYSICAL JOURNAL,735(1),1. |
| MLA | Wu, Qingwen,et al."EVIDENCE FOR RAPIDLY ROTATING BLACK HOLES IN FANAROFF-RILEY I RADIO GALAXIES".ASTROPHYSICAL JOURNAL 735.1(2011):1. |
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来源：上海天文台
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