The properties of molecular clouds with high redshifts (z = 2-3)

Details The properties of molecular clouds with high redshifts (z = 2-3) The properties of molecular clouds with high redshifts (z = 2-3)

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.107...51s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 107, no. 1, Dec. 1984, p. 51-59.

Astronomy and Astrophysics

Astrophysics

Absorption Spectra, Gas Density, Hydrogen Clouds, Molecular Clouds, Quasars, Red Shift, Cosmic Dust, Cosmic Gases, Galactic Evolution, Radiant Flux Density, Reaction Kinetics, Temperature Distribution, Ultraviolet Radiation

Scientific paper

This paper deals with molecular clouds discovered in the absorption spectra (z = 2 - 3) of distant quasars. It is argued that these clouds belong to the gaseous subsystems of young galaxies. The authors estimate the gas concentration to be n < 104cm-3 in the cloud observed in the direction of the quasar PHL 957. It is shown that this cloud is exposed to ultraviolet radiation. The UV-energy flux does not exceed the value typical for our Galaxy by an order of magnitude (F ≅ 2×10-6ergs cm-2s-1Å-1 at λ = 2000 Å). The mechanisms maintaining the thermal balance in this cloud are discussed.

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