Nature of the Background Ultraviolet Radiation Field at High Redshifts

Journal of astrophysics and astronomy

Pushpa Khare¹  Archana Samantaray¹ 

[1] Physics Department, Utkal University, Bhubaneswar, 751 004, India.$$

关键词: Quasars: absorption lines;    diffuse radiation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown