Statistics – Computation
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266....1b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 1-5.
Statistics
Computation
76
Absorption Spectra, Cosmology, Lyman Alpha Radiation, Stellar Models, Astronomical Models, Astronomical Spectroscopy, Computational Astrophysics, Emission Spectra, Nuclear Astrophysics
Scientific paper
The paper presents an alternative model for the Ly-alpha absorption forest which shows that a diffusely distributed baryonic intergalactic medium (IGM) left over from the primordial nucleosynthesis can also produce these forestlike absorption features on a quasar spectrum at the Ly-alpha transition frequency. The observed Ly-alpha forest spectra would thus be either seriously contaminated by the contribution from the diffuse medium or totally due to it. A statistical probability distribution function of equivalent widths of Ly-alpha lines is calculated from the synthetic spectra; it fits the observations in the range 0.1-0.5 A. In this model the IGM gas follows a polytropic state of equation with a mean temperature of 50,000 K, ionized background with flux 1.6 x 10 exp -21/h ergs sq cm Hz at the Lyman limit (13.6 eV). The correlation function of the lines exhibits no clustering on any of the scales.
Bi Hong-Guang
Boerner Gerhard
Chu Yan-Yi
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