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タイトル
  • Evolution of Lyman α clouds at low redshifts
  • en Evolution of Lyman α clouds at low redshifts
作成者
    • 池内, 了
    • e-Rad 90025461
    • OKOSHI, Katsuya
    • IKEUCHI, Satoru
権利情報
  • © 1994. The American Astronomical Society.
内容注記
  • Other application/pdf
  • Abstract We examine the evolution of an intergalactic gas cloud confined by the gravity of cold dark matter in the minihalo model. Assuming that the evolution of the diffuse ultraviolet (UV) flux follows a power law function of the form (1 + z)alphai with a change in exponent at redshift zc and a constant comoving number density of gas clouds, we can reproduce the evolution of the number of clouds per unit redshift at both high and low redshifts with alphaL = 2 for z less than or equal to zc and alphah = -4 (or -3) for z greater than zc with zc = 1.9 (or 1.8). Such a small value of alphaL implies much more UV flux at low redshifts than is expected from the luminosity function of observed quasars. Moreover, we find that the required intensity of this UV flux is consistent with observations of the Gunn-Peterson effect and of the continuum depression.
出版者 The American Astronomical Society
日付
    Issued1994-02
言語
  • eng
資源タイプ journal article
出版タイプ VoR
資源識別子 URI https://ir.soken.ac.jp/records/3296
関連
  • isIdenticalTo DOI https://doi.org/10.1086/187192 10.1086/187192
  • URI http://aas.org/publications/aas-copyright-policy Copyright
収録誌情報
    • ISSN 0004-637X
      • Astrophysical Journal, Part 2 - Letters en Astrophysical Journal, Part 2 - Letters
      • 巻421 号2 開始ページL79 終了ページL82
ファイル
コンテンツ更新日時 2023-08-18