Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261...52s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 52-56.
Astronomy and Astrophysics
Astronomy
Gas Temperature, Hydrogen Clouds, Intergalactic Media, Lyman Alpha Radiation, Red Shift, Astronomical Models, Quasars
Scientific paper
Recent high-resolution spectra of z about 2 quasars suggest that Ly-alpha clouds may have much lower temperatures (T about 5000 K) than previously thought (T about 30,000 K). This result is very uncertain at present, and there are still considerable differences between different groups of observers. In this paper we perform calculations based on the standard pressure-confined model of Ly-alpha clouds in order to test the possibility of obtaining such low temperatures. Our results suggest that it may be difficult to explain temperatures as low as 5000 K using the standard pressure-confined model of the clouds. We also give many observational predictions which may in the future allow the accuracy of the model to be tested.
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