Observational manifestations of the first protogalaxies in the 21 cm line

Details Observational manifestations of the first protogalaxies in the 21 cm line Observational manifestations of the first protogalaxies in the 21 cm line

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012arep...56...77v&link_type=abstract

Astronomy Reports, Volume 56, Issue 2, pp.77-83

Astronomy and Astrophysics

Astronomy

Scientific paper

The absorption properties of the first low-mass protogalaxies (mini-halos) forming at high redshifts in the 21-cm line of neutral hydrogen are considered. The absorption properties of these protogalaxies depend strongly on both their mass and evolutionary status. The optical depths in the line reach ˜0.1-0.2 for small impact parameters of the line of sight. As a protogalaxy is compressed, the influence of gas accretion can be seen, manifest as a non-monotonic frequency dependence of the optical depth. The absorption characteristics in the 21-cm line are determined by the thermal and dynamical evolution of the gas in the protogalaxies. Since the theoretical line width in the observer's rest frame is 1-6 kHz and the expected distance between lines 8.4 kHz, then the lines from low mass protogalaxies can be resolved using low frequency interferometers that exist or are being constructed.

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