Nature of the background ultraviolet radiation field

Details Nature of the background ultraviolet radiation field Nature of the background ultraviolet radiation field

2000-03-21

arxiv.org/abs/astro-ph/0003299v1

J.Astrophys.Astron. 21 (2001) 16

Astronomy and Astrophysics

Astrophysics

To be published in the Journal of Astronomy and Astrophysics

Scientific paper

10.1007/BF02702259

We have tried to determine the flux of the ultraviolet background radiation field from the column density ratios of various ions in several absorption systems observed in the spectra of QSOs. We find that in most cases the flux is considerably higher than what has been estimated to be contributed by the AGNs. The excess flux could originate locally in hot stars. In a few cases we have been able to show that such galactic flux can only contribute a part of the total required flux. The results suggest that the background gets a significant contribution from an unseen QSO population.

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