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- W3103454954 abstract "Recent observations with the Extreme Ultraviolet Explorer (EUVE) suggest that at least some clusters of galaxies are luminous sources of extreme ultraviolet (EUV) radiation. It is not clear yet whether EUV emission is a general feature of clusters; for the purposes of limiting the contribution to the background radiation, we assume that it is true of most clusters. Assuming that the source of the EUV emission is inverse Compton (IC) scattering of the cosmic microwave background photons by relativistic electrons, we construct a simple model for the expected average emission from clusters as a function of their mass and the redshift of interest. Press-Schechter theory is used to determine the abundance of clusters of various masses as a function of redshift. We determine the amount of background radiation produced by clusters. The total mean intensity, spectrum, and the ionization rates for H I and He II are determined at present and at a variety of redshifts. Because clusters form by the merger of smaller subclusters, the amount of EUV background radiation should be larger at present than in the past. We compare our results to the ionizing background expected from quasars. We find that while clusters do contribute a significant EUV background, it is less than 1% of that expected from quasars." @default.
- W3103454954 created "2020-11-23" @default.
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- W3103454954 date "2001-02-10" @default.
- W3103454954 modified "2023-09-26" @default.
- W3103454954 title "The Contribution of Extreme Ultraviolet from Clusters of Galaxies to the Cosmic Ionizing Background" @default.
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- W3103454954 doi "https://doi.org/10.1086/318677" @default.
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