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Formation of subgalactic clouds under ultraviolet background radiation
https://ir.soken.ac.jp/records/3511
https://ir.soken.ac.jp/records/3511a445081e-0ca0-4bf8-a14b-33195f814248
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
0004-637X_529_2_615 (720.4 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||
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| 公開日 | 2013-04-25 | |||||||||
| タイトル | ||||||||||
| タイトル | Formation of subgalactic clouds under ultraviolet background radiation | |||||||||
| タイトル | ||||||||||
| タイトル | Formation of subgalactic clouds under ultraviolet background radiation | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
| 資源タイプ | journal article | |||||||||
| 著者 |
KITAYAMA, Tetsu
× KITAYAMA, Tetsu
× IKEUCHI, Satoru
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| 著者別名 |
池内, 了
× 池内, 了
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| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | The effects of the ultraviolet (UV) background radiation on the formation of subgalactic clouds are studied by means of one-dimensional hydrodynamical simulations. The radiative transfer of the ionizing photons caused by the absorption by H I, He I, and He II, neglecting the emission, is explicitly taken into account. We find that the complete suppression of collapse occurs for the clouds with circular velocities typically in the range Vc ~ 15-40 km s-1 and the 50% reduction in the cooled gas mass with Vc ~ 20-55 km s-1. These values depend most sensitively on the collapse epoch of the cloud, the shape of the UV spectrum, and the evolution of the UV intensity. Compared with the optically thin case, previously investigated by Thoul & Weinberg in 1996, the absorption of the external UV photons by the intervening medium systematically lowers the above threshold values by ΔVc ~ 5 km s-1. Whether the gas can contract or keeps expanding is roughly determined by the balance between the gravitational force and the thermal pressure gradient when it is maximally exposed to the external UV flux. Based on our simulation results, we discuss a number of implications on galaxy formation, cosmic star formation history, and the observations of quasar absorption lines. In the Appendix, we derive analytical formulae for the photoionization coefficients and heating rates, which incorporate the frequency/direction-dependent transfer of external photons. | |||||||||
| 書誌情報 |
Astrophysical Journal Letters en : Astrophysical Journal Letters 巻 529, 号 2 PART 1, p. 615-634, 発行日 2000-02 |
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| 出版者 | ||||||||||
| 出版者 | IOP Publishing | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | ISSN | |||||||||
| 収録物識別子 | 20418205 | |||||||||
| DOI | ||||||||||
| 関連タイプ | isIdenticalTo | |||||||||
| 識別子タイプ | DOI | |||||||||
| 関連識別子 | http://doi.org/10.1086/308296/meta | |||||||||
| 関連名称 | 10.1086/308296/meta | |||||||||
| 権利 | ||||||||||
| 権利情報 | © 2000. The American Astronomical Society. | |||||||||
| 関連サイト | ||||||||||
| 識別子タイプ | URI | |||||||||
| 関連識別子 | http://iopscience.iop.org/page/copyright_notice | |||||||||
| 関連名称 | Copyright | |||||||||
| フォーマット | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | application/pdf | |||||||||
| 著者版フラグ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
