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Title:		On the possibility of radioastronomical investigation of the birth of galaxies
Authors:		SUNIAEV, R. A.; ZELDOVICH, IA. B.
Affiliation:		AA(Akademiia Nauk SSSR, Institut Kosmicheskikh Issledovanii, Moscow, USSR) AB(Akademiia Nauk SSSR, Institut Prikladnoi Matematiki, Moscow, USSR)
Journal:		Royal Astronomical Society, Monthly Notices, vol. 171, May 1975, p. 375-379.
Publication Date:		05/1975
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		GALACTIC EVOLUTION, HYDROGEN CLOUDS, MICROWAVE EMISSION, RADIO ASTRONOMY, ASTRONOMICAL MODELS, COSMOLOGY, GALACTIC CLUSTERS, HELIUM, LINE SPECTRA, RED SHIFT, SUPERHIGH FREQUENCIES
Bibliographic Code:		1975MNRAS.171..375S

Abstract

During the prestellar epoch, protogalaxies were composed mainly of neutral hydrogen with mass approximately 100 times the mass of interstellar gas in galaxies today. Protogalaxies and protoclusters of galaxies therefore radiated strongly in the 21-cm line of neutral hydrogen. Due to cosmological redshift this line will be shifted to the meter wavelength band, so detection of red-shifted 21-cm lines from protogalaxies may provide the possibility of finding the epoch of galaxy formation and the properties of protogalaxies.

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