Abstract
According to the minihalo model for the Ly α forest, the absorption lines arise from photoionized gas gravitationally confined in dark matter haloes of low circular velocity. Using the Press-Schechter formalism, we find that, in the CDM model, the number of Ly α clouds and their evolution with redshift are in agreement with observations if we assume a constant intensity for the ionizing background and a constant temperature for the gas in the minihaloes against changes in redshift. This is a generic consequence of the shape and the amplitude of the CDM spectrum on subgalactic scales; the evolution is due to the disappearance of the minihaloes as they merge into larger systems, although other effects may also modify the evolution rate
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
