Abstract
view Abstract Citations (112) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of Dust in Damped Lyman-Alpha Systems Fall, S. Michael ; Pei, Yichuan C. ; McMahon, Richard G. Abstract We find that quasars with damped Lyα systems in the foreground tend to appear redder than those without damped Lyα systems in the foreground. Our detection, at or above the 99% confidence level, is based on the spectra recently obtained by Sargent, Steidel, and Boksenberg. We estimate that the typical dust-to-gas ratio in the damped Lyα systems is 1/20 to one-fourth of that in the Milky Way, with the exact value depending on the shape of the extinction curve. A comparison of our results with the upper limits from previous searches suggests that the 2200 A feature may be weak or absent. This and the small dust-to-gas ratio are consistent with other evidence that the damped Lyα systems are in an early phase of chemical evolution. The dust we have detected is probably sufficient to extinguish a large fraction of any Lyα photons emitted within the damped Lyα systems. Publication: The Astrophysical Journal Pub Date: June 1989 DOI: 10.1086/185444 Bibcode: 1989ApJ...341L...5F Keywords: Cosmic Dust; Lyman Alpha Radiation; Quasars; Astronomical Spectroscopy; Cosmic Gases; Intergalactic Media; Astrophysics; COSMOLOGY; GALAXIES: INTERGALACTIC MEDIUM; QUASARS full text sources ADS | data products SIMBAD (5) NED (5)
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