Triggering the Formation of Direct Collapse Black Holes by Their Congeners
文献类型：期刊论文
| 作者 | Yue, Bin1,2; Ferrara, Andrea2,3; Pacucci, Fabio2,4; Omukai, Kazuyuki5 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-04-01 |
| 卷号 | 838期号:2 |
| 关键词 | dark ages reionization first stars quasars: supermassive black holes X-rays: diffuse background |
| 英文摘要 | Direct collapse black holes (DCBHs) are excellent candidates for seeds of supermassive black holes observed at z greater than or similar to 6. The formation of a DCBH requires a strong external radiation field to suppress H-2 formation and cooling in a collapsing gas cloud. Such a strong field is not easily achieved by first stars or normal star-forming galaxies. Here we investigate a scenario in which a previously formed DCBH can provide the necessary radiation field for the formation of additional ones. Using a one-zone model and simulated DCBH Spectral Energy Distributions (SEDs) filtered through absorbing gas initially having column density N-H, we derive the critical field intensity, J(LW)(crit), to suppress H-2 formation and cooling. For the SED model with N-H= 1.3 x 10(25) cm(-2), 8.0. x. 10(24) cm(-2), and 5.0. x. 10(24) cm(-2), we obtain J(LW)(crit) approximate to 22, 35, and 54, all much smaller than the critical field intensity for normal starforming galaxies J(LW)(crit) greater than or similar to 1000 X-ray photons from previously formed DCBHs build up a high-z X-ray background (XRB) that may boost the J(LW)(crit). However, we find that in the three SED models, J(LW)(crit) only increases to approximate to 80, 170, and 390, even when rho center dot reaches the maximum value allowed by the present-day XRB level (0.22, 0.034, 0.006M(circle dot) yr(-1) Mpc(-3)), which is still much smaller than the galactic value. Although considering the XRB from first galaxies may further increase J(LW)(crit), we conclude that our investigation supports a scenario in which DCBHs may be more abundant than predicted by models only including galaxies as external radiation sources. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DARK-MATTER HALOES ; PRIMORDIAL STAR-FORMATION ; X-RAY-EMISSION ; EARLY UNIVERSE ; 1ST GALAXIES ; STELLAR POPULATIONS ; LOW-METALLICITY ; HYDROGEN MOLECULES ; SUPERMASSIVE STAR ; HIGH REDSHIFTS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000398275400012 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8234]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy 3.Univ Tokyo, Todai Inst Adv Study, Kavli IPMU WPI, Tokyo, Japan 4.Yale Univ, Dept Phys, POB 208101, New Haven, CT 06520 USA 5.Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan |
| 推荐引用方式 GB/T 7714 | Yue, Bin,Ferrara, Andrea,Pacucci, Fabio,et al. Triggering the Formation of Direct Collapse Black Holes by Their Congeners[J]. ASTROPHYSICAL JOURNAL,2017,838(2). |
| APA | Yue, Bin,Ferrara, Andrea,Pacucci, Fabio,&Omukai, Kazuyuki.(2017).Triggering the Formation of Direct Collapse Black Holes by Their Congeners.ASTROPHYSICAL JOURNAL,838(2). |
| MLA | Yue, Bin,et al."Triggering the Formation of Direct Collapse Black Holes by Their Congeners".ASTROPHYSICAL JOURNAL 838.2(2017). |
入库方式： OAI收割
来源：国家天文台
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