Computer Science – Sound
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0509m&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #05.09; Bulletin of the American Astronomical Society, Vol. 25, p.795
Computer Science
Sound
Scientific paper
~ }} <}}} The hydrodynamical evolution of spherical perturbations consisting of dark matter and a hydrogen/helium baryonic component is computed to model the evolution of Lyalpha forest systems. If the IGM is photoionized for z≲6, the baryons in perturbations with circular velocities less than the sound speed will expand into the IGM driven by their thermal pressure. The hydrodynamical motion of these clouds will preserve to high accuracy a Voigt line profile, with a Doppler b-parameter, measuring the width of the absorption lines, in the range 25≲ b≲ 70kms(-1) . For low column density systems (NHI ≲ 10(14}cm({-2)) ), b is found to decrease for decreasing column density. These lines arise in the interface between the cloud and the IGM. Expansion cooling is found to cool the clouds effectively, but the required velocities are too large to account for the very low b-values (b<20kms(-1) ), reported in the literature. The clouds have diameters at z=2.5 as large as 100kpc for q_0=0.5, and 400kpc for q_0=0.1, both for H_0=50kms(-1) Mpc(-1) .
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