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Title:
The contribution of young galaxies to the X-ray background
Authors:
Bookbinder, J.; Cowie, L. L.; Ostriker, J. P.; Krolik, J. H.; Rees, M.
Affiliation:
AA(Princeton University New Observatory, Princeton, N.J.), AB(Princeton University New Observatory, Princeton, N.J.), AC(Princeton University New Observatory, Princeton, N.J.), AD(Institute for Advanced Study, Princeton, N.J.), AE(Cambridge University, Cambridge, England)
Publication:
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 647-654. (ApJ Homepage)
Publication Date:
05/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BACKGROUND RADIATION, BREMSSTRAHLUNG, COSMOLOGY, GALACTIC RADIATION, X RAY ASTRONOMY, DIFFUSE RADIATION, STELLAR WINDS, SUPERNOVAE, X RAY BINARIES, X RAY SPECTROSCOPY
Comment:
A&AA ID. AAA027.142.134
DOI:
10.1086/157911
Bibliographic Code:
1980ApJ...237..647B

Abstract

The contribution of young galaxies to the diffuse X-ray background is estimated and two mechanisms by which young galaxies may emit hard X-rays are considered. The first mechanism is direct thermal bremsstrahlung emission from a hot galactic wind powered by supernovae. Estimating mass-loss rates from galaxies by arguments based on metallicity and on the X-ray spectroscopic observations of rich clusters, it is shown that galactic winds may contribute substantially to the background. The second mechanism relies on the decreased metallicity of young galaxies to increase the number of supergiant stars and hence the numbers of hard X-ray binaries. This effect quantitatively explains the relatively large X-ray luminosity of the Magellanic clouds and also indicates that binaries in young galaxies may contribute a significant fraction of the diffuse X-ray background. Both mechanisms require that the epoch of galaxy formation be recent (redshift less than 2-3) in order to account for the observed spectral temperature (45 keV) of the hard X-ray background.

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