Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..584c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 584-592.
Astronomy and Astrophysics
Astrophysics
39
H I Regions, Intergalactic Media, Lyman Alpha Radiation, Quasars, Abundance, Line Spectra, Red Shift, Signal To Noise Ratios
Scientific paper
The authors present high signal-to-noise spectroscopic observations of the z = 1.776 absorption system toward the QSO MC 1331+170. The system contains strong H I Lyα absorption characteristic of the so-called "Lyman-α disk" systems from which a neutral hydrogen column density of 1.5×1021cm-2 is inferred. Data on lines of C, Si, Fe, O, Mg, and Al at the Lyα and 21 cm redshift are presented and a range of simple physical models for the absorbing cloud is constructed. The most plausible of these suggest matter and energy densities in the z = 1.776 cloud similar to those found in Galactic diffuse interstellar clouds: density nH ≈ 10 - 3000 cm-3 and an ultraviolet radiation field 0.1 - 50 times as intense as mean Galactic starlight. The authors synthesize the H2 spectrum and predict that if its column density exceeds 1014cm-2 it should be detectable with the Space Telescope.
Black John Harry
Chaffee Frederic H. Jr.
Foltz Craig B.
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