Are Ly-alpha clouds detectable in emission at 21 cm?

Details Are Ly-alpha clouds detectable in emission at 21 cm? Are Ly-alpha clouds detectable in emission at 21 cm?

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144l..17v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 2, March 1985, p. L17-L19.

Astronomy and Astrophysics

Astrophysics

Extragalactic Radio Sources, Galactic Clusters, Intergalactic Media, Interstellar Masers, Lyman Alpha Radiation, Quasars, Absorption Spectra, Centimeter Waves, Interstellar Gas, Lyman Spectra, Microwave Emission, Oort Cloud, Red Shift

Scientific paper

The author considers two hypotheses concerning the nature of the objects which produce the Ly-α absorption features in the optical spectra of QSOs (Sargent et al. 1980): first, he argues that Oort's (1981) suggestion that such features arise in superclusters is not ruled out by the lack of correlations of the Ly-α lines in the spectra of two QSOs close on the sky (Sargent et al., 1982), due to the filamentary nature of superclusters. He suggests that such superclusters may be detectable as 21 cm emission lines at very high redshifts. Second, he proposes that, if the lines are due to a new species of objects (Sargent et al., 1980, Ostriker and Ikeuchi, 1983), maser action may take place, which might make these objects detectable as high-redshift 21 cm line emitters.

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