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Title
  • Evolution of Lyman α clouds at low redshifts
  • en Evolution of Lyman α clouds at low redshifts
Creator
    • 池内, 了
    • e-Rad 90025461
    • OKOSHI, Katsuya
    • IKEUCHI, Satoru
Rights
  • © 1994. The American Astronomical Society.
Description
  • 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.
Publisher The American Astronomical Society
Date
    Issued1994-02
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier URI https://ir.soken.ac.jp/records/3296
Relation
  • isIdenticalTo DOI https://doi.org/10.1086/187192 10.1086/187192
  • URI http://aas.org/publications/aas-copyright-policy Copyright
Journal
    • ISSN 0004-637X
      • Astrophysical Journal, Part 2 - Letters en Astrophysical Journal, Part 2 - Letters
      • Volume Number421 Issue Number2 Page StartL79 Page EndL82
File
Oaidate 2023-08-18