The theory of QSO absorption line systems and their relationship to the galaxies

Details The theory of QSO absorption line systems and their relationship to the galaxies The theory of QSO absorption line systems and their relationship to the galaxies

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993psu..reptw....c&link_type=abstract

Annual Status Report Pennsylvania State Univ., University Park.

Computer Science

Absorption Spectra, Galactic Halos, Galactic Structure, Galaxies, Intergalactic Media, Lyman Spectra, Quasars, Dark Matter, Mass Distribution, Pressure, Rotating Disks

Scientific paper

The fundamental goal of this effort is to paint a picture of what the Ly-alpha forest clouds are and how they are distributed in space. Progress during the first phase of this program involved development of the 'Cheshire Cat Model' of Ly-alpha clouds in which systems over a large range of column densities are produced by disks with somewhat smaller column densities than those of normal galaxies. A prediction of the slab model of Ly-alpha clouds was confirmed by a new observational result, and the comparison of models to the new data allowed an estimate of the pressure of the intergalactic medium. This result should be forthcoming in pre-print form within the next month. The various results will now be described in more detail.

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