Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378....6p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 6-16.
Astronomy and Astrophysics
Astrophysics
190
Intergalactic Media, Line Of Sight, Lyman Alpha Radiation, Milky Way Galaxy, Quasars, Carbon, Heavy Elements, Red Shift, Signal To Noise Ratios
Scientific paper
This study presents new spectra of quasars in the Wolfe et al. (1988) sample: 13 with damped Ly-alpha systems along with the lines of sight and 15 without. Spectral indices are determined over a common range of wavelengths in the rest frames of the quasars between Ly-alpha and C IV emission. Several internal and external checks indicate that the typical errors in the spectral indices are + or - 0.1. Quasars with damped Ly-alpha systems in the foreground are found to be stochastically redder than those without damped Ly-a systems in the foreground. Dust-to-gas ratios from the spectral indices are computed on the assumption that the extinction curve in the damped Ly-alpha systems has the same shapes as that in the Milky Way or the L or S MC. Estimates of the typical dust-to-gas ratio in the damped Ly-alpha systems are 5 to 20 percent of that in the Milky Way. It is concluded that the overall abundances of heavy elements in both the gas and solid phases are about one order of magnitude lower than the Galactic value.
Bechtold Jill
Fall Michael S.
Pei Yichuan C.
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