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  1. 010 学術雑誌論文
  2. 池内, 了 / IKEUCHI, Satoru

Formation of subgalactic clouds under ultraviolet background radiation

https://ir.soken.ac.jp/records/3511
https://ir.soken.ac.jp/records/3511
a445081e-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.pdf 0004-637X_529_2_615 (720.4 kB)
Item type 学術雑誌論文 / Journal Article(1)
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

KITAYAMA, Tetsu

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IKEUCHI, Satoru

× IKEUCHI, Satoru

IKEUCHI, Satoru

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著者別名 池内, 了

× 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
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
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