Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2805b&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #28.05; Bulletin of the American Astronomical Society, Vol. 27, p.852
Astronomy and Astrophysics
Astronomy
Scientific paper
Using a sample of 119 QSOs, containing objects we have selected having previously available high quality ground-based and IUE spectral observations, together with Hubble Space Telescope (HST) observations of 26 QSOs from Bahcall et al. (1993, 1995) and Impey et al. (1995) and new optical observations of 41 objects by Steidel and Sargent (1994), we study the redshift evolution of Lyman limit absorption systems (LLSs; gamma > 1.0) over the reshift range 0.32 <= zLLS 4.11. The HST observations significantly improve the determination of the low redshift (0.4 <= zLLS <= 1.4) distribution. After removing objects which may bias our sample, leaving a total of 169 QSOs, we find the distribution is well described by a single power law, and obtain for the number density as a function of redshift the form N(z) = N_o(1+z)(gamma ) with gamma =1.50+/-0.39 and N_o=0.25_{+0.27}(-0.10) , consistent with a constant comoving density of absorbers in a Friedmann universe with q_o=0 but indicating evolution if q_o=1/2.
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