Contribution to the ultraviolet metagalactic background from radiative recombination in intervening absorbers

Physics

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Background Radiations, Radiation Mechanisms, Polarization, Quasars

Scientific paper

Recently, Haardt & Madau (HM) showed that QSO absorption-line systems are not only sinks of the ultraviolet metagalactic background (UMB), but also significant sources of the UMB due to recombination radiation within photoionized absorbers. We demonstrate that the contribution to the UMB from H I and He II recombination radiation may be less than Haardt & Madau's by a factor of about 0.4 if intervening absorbers are modeled as a slab illuminated isotropically on two sides and the recombination radiation is assumed to be isotropic. This is the case which most closely approximates QSOs absorption-line systems.

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