GROWTH OF MASSIVE BLACK HOLES AT THEIR LATE STAGE
文献类型：期刊论文
| 作者 | Xu, Ya-Di1; Cao, Xinwu2
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2010-06-20 |
| 卷号 | 716期号:2页码:1423-1430 |
| 关键词 | accretion black hole physics galaxies: active quasars: general X-rays: diffuse background accretion disks |
| 英文摘要 | It is believed that the growth of local massive black holes was dominated by accretion during quasar phases, while a fraction of the local black hole mass was accumulated through accreting gases at very low rates. We derive the black hole mass density as a function of redshift with the bolometric luminosity function of active galactic nuclei (AGNs) assuming that massive black holes grew via accreting the circumnuclear gases, in which the derived black hole mass density is required to match the measured local black hole mass density at z = 0. Advection-dominated accretion flows (ADAFs) are supposed to be present in low-luminosity AGNs/normal galaxies, which are very hot and radiate mostly in the hard X-ray band. Most of the X-ray background (XRB) is contributed by bright AGNs, and a variety of AGN population synthesis models were developed to model the observed XRB in the last two decades. Based on our derived black hole mass density, we calculate the contribution to the XRB from the ADAFs in faint AGNs/normal galaxies with a given Eddington ratio distribution, which is mostly in the hard X-ray energy band with an energy peak at similar to 200 keV. The growth of massive black holes during the ADAF phase can therefore be constrained with the observed XRB. Combining an AGN population synthesis model with our results, we find that the fitting on the observed XRB, especially at the hard X-ray energy band with greater than or similar to 100 keV, is improved provided the contribution of the ADAFs in low-luminosity AGNs/normal galaxies is properly included. It is found that less than similar to 15% of local massive black hole mass density was accreted during ADAF phases. We suggest that more accurate measurements of the XRB in the energy band with greater than or similar to 100 keV in the future may help constrain the growth of massive black holes at their late stage. We also calculate their contribution to the extragalactic gamma-ray background (EGRB), and find that less than similar to 1% of the observed EGRB is contributed by the ADAFs in these faint sources. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 天体物理学 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; ADVECTION-DOMINATED ACCRETION ; GAMMA-RAY EMISSION ; EDDINGTON RATIO DISTRIBUTION ; QUASAR LUMINOSITY FUNCTION ; RADIO-LOUD AGN ; COSMOLOGICAL EVOLUTION ; XMM-NEWTON ; CONSTRAINTS ; SPECTRA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000278459000043 |
| 公开日期 | 2011-06-29 |
| 源URL | [http://119.78.226.72//handle/331011/13357]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, 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 | Xu, Ya-Di,Cao, Xinwu. GROWTH OF MASSIVE BLACK HOLES AT THEIR LATE STAGE[J]. ASTROPHYSICAL JOURNAL,2010,716(2):1423-1430. |
| APA | Xu, Ya-Di,&Cao, Xinwu.(2010).GROWTH OF MASSIVE BLACK HOLES AT THEIR LATE STAGE.ASTROPHYSICAL JOURNAL,716(2),1423-1430. |
| MLA | Xu, Ya-Di,et al."GROWTH OF MASSIVE BLACK HOLES AT THEIR LATE STAGE".ASTROPHYSICAL JOURNAL 716.2(2010):1423-1430. |
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来源：上海天文台
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