ON THE ORIGIN OF ULTRAVIOLET EMISSION AND THE ACCRETION MODEL OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI
文献类型：期刊论文
| 作者 | Yu, Zhaolong1,2; Yuan, Feng1 ; Ho, Luis C.3
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-01-10 |
| 卷号 | 726期号:2页码:87 |
| 关键词 | accretion black hole physics galaxies: active quasars: general ultraviolet: general accretion disks |
| 英文摘要 | Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncated thin disk, and a jet. Maoz recently challenged this picture based on the observation that the strength of ultraviolet emission relative to the X-ray and radio bands does not depart from empirical trends defined by more luminous sources. He advocates that AGNs across all luminosities have essentially the same accretion and radiative processes, which in luminous sources are described by a standard optically thick, geometrically thin disk. We calculate ADAF models and demonstrate that they can successfully fit the observed spectral energy distributions of the LLAGNs in Maoz's sample. Our model naturally accommodates the radio and X-ray emission, and the ultraviolet flux is well explained by a combination of the first-order Compton scattering in the ADAF, synchrotron emission in the jet, and black body emission in the truncated thin disk. It is premature to dismiss the ADAF model for LLAGNs. The UV data can be fitted equally well using a standard thin disk, but an additional corona and jet would be required to account for the X-ray and radio emission. We argue that there are strong theoretical reasons to prefer the ADAF model over the thin disk scenario. We discuss testable predictions that can potentially discriminate between the two accretion models. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RADIATIVELY INEFFICIENT ACCRETION ; ADVECTION-DOMINATED ACCRETION ; X-RAY BINARIES ; SPECTRAL ENERGY-DISTRIBUTIONS ; BLACK-HOLE ACCRETION ; XMM-NEWTON ; SEYFERT-GALAXIES ; RADIO LOUDNESS ; XTE J1118+480 ; A-ASTERISK |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000285623600031 |
| 公开日期 | 2015-01-29 |
| 源URL | [http://119.78.226.72//handle/331011/15494]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Observ Carnegie Inst Washington, Pasadena, CA 91101 USA |
| 推荐引用方式 GB/T 7714 | Yu, Zhaolong,Yuan, Feng,Ho, Luis C.. ON THE ORIGIN OF ULTRAVIOLET EMISSION AND THE ACCRETION MODEL OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2011,726(2):87. |
| APA | Yu, Zhaolong,Yuan, Feng,&Ho, Luis C..(2011).ON THE ORIGIN OF ULTRAVIOLET EMISSION AND THE ACCRETION MODEL OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,726(2),87. |
| MLA | Yu, Zhaolong,et al."ON THE ORIGIN OF ULTRAVIOLET EMISSION AND THE ACCRETION MODEL OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 726.2(2011):87. |
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来源：上海天文台
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