Spectral appearance of non-uniform gas at high Z

Details Spectral appearance of non-uniform gas at high Z Spectral appearance of non-uniform gas at high Z

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..791h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 188, Sept. 1979, p. 791-798.

Mathematics

Spectral Theory

92

Galactic Evolution, Heavy Nuclei, Lyman Alpha Radiation, Red Shift, Spectral Signatures, Background Radiation, Cosmology, Galactic Clusters, Ionized Gases, Line Spectra, Spectral Theory

Scientific paper

This paper suggests that observations with good spatial and spectral resolution may yield evidence on the condensation and thermal history of primordial gas at redshifts somwehat larger than those of the most remote discrete sources. It is shown that the contribution of 21-cm H I emission to the radio background observed with coarse angular and spectral resolution is no more than about 1 K in brightness temperature and that this contribution may be distinguishable because the nonuniform distribution of H I imposes a characteristic spectral structure on certain angular scales. Ly-alpha emission from high-redshift H II is found to be a possible major contribution to the extragalactic background light. It is concluded that detection of fine spectral structure in this background would yield information on the distribution and thermal history of primordial gas.

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