Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..385w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 385-396.
Astronomy and Astrophysics
Astrophysics
8
Absorption Spectra, Hydrogen Clouds, Lyman Alpha Radiation, Quasars, Hydrodynamic Equations, Line Spectra, Pressure Distribution, Space Density
Scientific paper
We use a hydrodynamic numerical code to study the evolution of spherical, optically thin, pressure-confined Ly-alpha clouds in an adiabatically evolving intercloud medium. We use the results to construct the associated synthetic dN/dz and dN/dN(HI) distributions and compare them against observations as well as to the analytical predictions. We find that the model can largely account for the observed column density distribution with a cloud mass spectrum dN varies as M super -delta dM, delta = 1.90; however, discrepancies are present at high column densities. In particular, the synthetic dN/dN(HI) exhibits a deficiency of clouds with log (N(HI)) greater than about 15.5 and the column density distribution for a restricted redshift range about 2.7 has an abrupt cutoff not seen in the observations.
Babul Arif
Williger Gerard. M.
No associations
LandOfFree
Pressure-confined Ly-alpha clouds - Simulation results versus observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pressure-confined Ly-alpha clouds - Simulation results versus observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-confined Ly-alpha clouds - Simulation results versus observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1551731