A Simulation of Lyalpha Absorption Forests in Liner Approximation

Details A Simulation of Lyalpha Absorption Forests in Liner Approximation A Simulation of Lyalpha Absorption Forests in Liner Approximation

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1405f&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #14.05; Bulletin of the American Astronomical Society, Vol. 26, p.1331

Astronomy and Astrophysics

Astronomy

Scientific paper

We have developed a technique of simulating Lyalpha absorption in QSO spectra in a linear approximation regime, in which the collapse of baryonic matter is treated by a Press-Schecter-like criterion. The simulated Lyalpha forests in models of the standard cold dark matter (SCDM), the cold plus hot dark matter (CHDM), and the low-density flat cold dark matter (LCDM) have been confronted with observational features, including 1) the number density of Lyalpha lines and its dependencies on redshift and equivalent width; 2) the distribution of equivalent widths and its redshift dependence; 3) clustering; and 4) the Gunn-Peterson effect. Within a reasonable range of J_nu , the UV background radiation at high redshift, and delta_ {th}, the linear threshold of the onset of gravitational collapse of the baryonic matter, the LCDM model is generally in agreement with observational data in all above-mentioned aspects. The model of SCDM seems to show some lack of Lyalpha lines at redshifts less than 2.5, but it can survive if we take a smaller J_nu and a higher delta_ {th}. This suggests that whether a significant part of the Lyalpha forest lines is given by halos of galaxies or galaxy-like objects would be crucial to the success of SCDM. The ``standard" CHDM model, i.e. 60% cold and 30% hot dark matters and 10% baryons, is found to be unable to survive under the Lyalpha forest tests, because it produces structures too late and favors to form structures on large scales instead of small scale objects like Lyalpha clouds.

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