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

Criteria for the formation of population III objects in the ultraviolet background radiation

https://ir.soken.ac.jp/records/3291
https://ir.soken.ac.jp/records/3291
9b8504eb-be1c-47ed-ba70-b9a09762838c
名前 / ファイル ライセンス アクション
j.1365-2966.2001.04669.x.pdf j.1365-2966.2001.04669.x (522.6 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2012-12-13
タイトル
タイトル Criteria for the formation of population III objects in the ultraviolet background radiation
タイトル
タイトル Criteria for the formation of population III objects in the ultraviolet background radiation
言語 en
言語
言語 eng
キーワード
言語 en
主題Scheme Other
主題 molecular processes,radiative transfer,galaxies, formation,cosmology,theory,diffuse radiation
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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SUSA, Hajime

× SUSA, Hajime

SUSA, Hajime

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UMEMURA, Masayuki

× UMEMURA, Masayuki

UMEMURA, Masayuki

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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 We explore possibilities of collapse and star formation in Population III objects exposed to the external ultraviolet background (UVB) radiation. Assuming spherical symmetry, we solve self-consistently radiative transfer of photons, non-equilibrium H2 chemistry and gas hydrodynamics. Although the UVB does suppress the formation of low-mass objects, the negative feedback turns out to be weaker than previously suggested. In particular, the cut-off scale of collapse drops significantly below the virial temperature Tvir∼104 K at weak UV intensities (J21≲10−2), owing to both self-shielding of the gas and H2 cooling. Clouds above this cut-off tend to contract highly dynamically, further promoting self-shielding and H2 formation. For plausible radiation intensities and spectra, the collapsing gas can cool efficiently to temperatures well below 104 K before rotationally supported and the final H2 fraction reaches ∼ 10−3.

Our results imply that star formation can take place in low-mass objects collapsing in the UVB. The threshold baryon mass for star formation is ∼ 109 M⊙ for clouds collapsing at redshifts z≲3, but drops significantly at higher redshifts. In a conventional cold dark matter universe, the latter coincides roughly with that of the 1σ density fluctuations. Objects near and above this threshold can thus constitute ‘building blocks’ of luminous structures, and we discuss their links to dwarf spheroidal/elliptical galaxies and faint blue objects. These results suggest that the UVB can play a key role in regulating the star formation history of the Universe.
書誌情報 Monthly Notices of the Royal Astronomical Society
en : Monthly Notices of the Royal Astronomical Society

巻 326, 号 4, p. 1353-1366, 発行日 2001-10
出版者
出版者 Wiley
ISSN
収録物識別子タイプ ISSN
収録物識別子 00358711
DOI
関連タイプ isIdenticalTo
識別子タイプ DOI
関連識別子 https://doi.org/10.1111/j.1365-2966.2001.04669.x
関連名称 10.1111/j.1365-2966.2001.04669.x
権利
権利情報 ©2001 The Royal Astronomical Society
関連サイト
識別子タイプ URI
関連識別子 http://www.blackwellpublishing.com/pdf/mnr_caf.pdf
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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