| Autor: |
Shchekinov, Yu. A., Entel, M. B., Dudenko, A. I. |
| Zdroj: |
Astrophysics and Space Science; December 1984, Vol. 107 Issue: 1 p51-59, 9p |
| Abstrakt: |
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. We estimate the gas concentration to ben<104 cm-3 in the cloud observed in the direction of the quasar PHL957. 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?2×10-6 ergs cm-2 s-1 Å-1 at ?=2000 Å). The mechanisms maintaining the thermal balance in this cloud are discussed. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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