@article{oai:ir.soken.ac.jp:00003296,
 author = {池内, 了 and OKOSHI, Katsuya and IKEUCHI, Satoru},
 issue = {2},
 journal = {Astrophysical Journal, Part 2 - Letters, Astrophysical Journal, Part 2 - Letters},
 month = {Feb},
 note = {application/pdf, 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.},
 pages = {L79--L82},
 title = {Evolution of Lyman α clouds at low redshifts},
 volume = {421},
 year = {1994}
}