Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..883r&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 883-891.
Astronomy and Astrophysics
Astronomy
20
Absorption Spectra, Hydrogen Clouds, Intergalactic Media, Radio Astronomy, Radio Galaxies, Astronomical Models, Interstellar Extinction
Scientific paper
A survey of 41 radio galaxies for H I absorption was made. One new absorption system was found, that in 3C 178. Upper limits to the H I optical depth are derived for the remaining systems. The observations extend to z = 0.34, corresponding to the low-frequency limit of the receiver. The absorption data indicate that, for an optical depth of 0.03 or less, the product of the spatial density of H I clouds and their projected area is less than 0.0022 per Mpc. Although this product is not particularly restrictive, it does indicate a discrete cloud H I mass-density model at least an order of magnitude less than the critical cosmological density. Some emission data supply an upper bound on the spatial density of H I clouds of mass above approximately one billion solar masses.
Roberts Morton S.
Steigerwald D. G.
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