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Semi analytic approach to understanding the distribution of neutral hydrogen in the universe: Comparison of simulations with observations
T. Roy Choudhury, R. Srianand, T. Padmanabhan
Following Bi & Davidsen (1997), we perform one dimensional semi analytic simulations along the lines of sight to model the intergalactic medium (IGM). Since this procedure is compu…
Molecular hydrogen and the nature of damped Lyman-alpha systems
Patrick Petitjean, R. Srianand, Cédric Ledoux
We report results from our mini-survey for molecular hydrogen in eight high redshift damped Lyman-alpha (DLA) systems using the ESO Ultra-violet and Visible Spectrograph on the VLT…
Structure of the MgII and damped Lyman-alpha systems along the line of sight to APM 08279+5255
Patrick Petitjean, Bastien Aracil, R. Srianand +1
A study of the absorption systems toward the gravitationally lensed quasar APM 08279+5255 is presented. Most of the MgII systems in the redshift range 1.2-2.07, although saturated,…
Semi analytic approach to understanding the distribution of neutral hydrogen in the universe
T. Roy Choudhury, T. Padmanabhan, R. Srianand
Analytic derivations of the correlation function and the column density distribution for neutral hydrogen in the IGM are presented, assuming that the non-linear baryonic mass densi…
Physical conditions in broad and associated narrow absorption-line systems toward APM 08279+5255
R. Srianand, P. Petitjean
Results of a careful analysis of the absorption systems with zabs = zem seen toward the bright, z_em ~ 3.91, gravitationally lensed quasar APM 08279+5255 are presented. Two of the…