EXPLORING THE UNUSUALLY HIGH BLACK-HOLE-TO-BULGE MASS RATIOS IN NGC 4342 AND NGC 4291: THE ASYNCHRONOUS GROWTH OF BULGES AND BLACK HOLES
文献类型：期刊论文
| 作者 | Bogdan, Akos1; Forman, William R.1; Zhuravleva, Irina2; Mihos, J. Christopher3; Kraft, Ralph P.1; Harding, Paul3; Guo, Qi4,5 ; Li, Zhiyuan1; Churazov, Eugene2; Vikhlinin, Alexey1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-07-10 |
| 卷号 | 753期号:2 |
| 关键词 | galaxies: bulges galaxies: elliptical and lenticular, cD galaxies: evolution galaxies: individual (NGC 4291, NGC 4342) X-rays: galaxies X-rays: ISM |
| 英文摘要 | We study two nearby early-type galaxies, NGC 4342 and NGC 4291, that host unusually massive black holes relative to their low stellar mass. The observed black-hole-to-bulge mass ratios of NGC 4342 and NGC 4291 are 6.9(-2.3)(+3.8)% and 1.9% +/- 0.6%, respectively, which significantly exceed the typical observed ratio of similar to 0.2%. As a consequence of the exceedingly large black-hole-to-bulge mass ratios, NGC 4342 and NGC 4291 are approximate to 5.1 sigma and approximate to 3.4 sigma outliers from the M-center dot-M-bulge scaling relation, respectively. In this paper, we explore the origin of the unusually high black-hole-to-bulge mass ratio. Based on Chandra X-ray observations of the hot gas content of NGC 4342 and NGC 4291, we compute gravitating mass profiles, and conclude that both galaxies reside in massive dark matter halos, which extend well beyond the stellar light. The presence of dark matter halos around NGC 4342 and NGC 4291 and a deep optical image of the environment of NGC 4342 indicate that tidal stripping, in which greater than or similar to 90% of the stellar mass was lost, cannot explain the observed high black-hole-to-bulge mass ratios. Therefore, we conclude that these galaxies formed with low stellar masses, implying that the bulge and black hole did not grow in tandem. We also find that the black hole mass correlates well with the properties of the dark matter halo, suggesting that dark matter halos may play a major role in regulating the growth of the supermassive black holes. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000305912700047 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6197]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Smithsonian Astrophys Observ, Cambridge, MA 02138 USA 2.Max Planck Inst Astrophys, D-85741 Garching, Germany 3.Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA 4.Chinese Acad Sci, Partner Grp, Max Planck Inst Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China 5.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 6.Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria |
| 推荐引用方式 GB/T 7714 | Bogdan, Akos,Forman, William R.,Zhuravleva, Irina,et al. EXPLORING THE UNUSUALLY HIGH BLACK-HOLE-TO-BULGE MASS RATIOS IN NGC 4342 AND NGC 4291: THE ASYNCHRONOUS GROWTH OF BULGES AND BLACK HOLES[J]. ASTROPHYSICAL JOURNAL,2012,753(2). |
| APA | Bogdan, Akos.,Forman, William R..,Zhuravleva, Irina.,Mihos, J. Christopher.,Kraft, Ralph P..,...&Jones, Christine.(2012).EXPLORING THE UNUSUALLY HIGH BLACK-HOLE-TO-BULGE MASS RATIOS IN NGC 4342 AND NGC 4291: THE ASYNCHRONOUS GROWTH OF BULGES AND BLACK HOLES.ASTROPHYSICAL JOURNAL,753(2). |
| MLA | Bogdan, Akos,et al."EXPLORING THE UNUSUALLY HIGH BLACK-HOLE-TO-BULGE MASS RATIOS IN NGC 4342 AND NGC 4291: THE ASYNCHRONOUS GROWTH OF BULGES AND BLACK HOLES".ASTROPHYSICAL JOURNAL 753.2(2012). |
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来源：国家天文台
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