Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l..15t&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. L15-L18. Research supported by Inst
Astronomy and Astrophysics
Astrophysics
11
Active Galactic Nuclei, Intergalactic Media, Ionizing Radiation, Seyfert Galaxies, Ultraviolet Radiation, Background Radiation, Lyman Alpha Radiation, Quasars, Red Shift, Stellar Luminosity
Scientific paper
Recently the appreciation that the X-ray background is the superposition of the X-ray emission from low-luminosity active galactic nuclei (AGNs), has been generalized. AGNs are also powerful emitters of the ultraviolet radiation and the intergalactic ionizing flux is possibly supplied by them. The metagalactic ionizing flux from AGNs are evaluated on the basis of the X-ray luminosity function and the luminosity evolution of AGNs. The predicted UV flux is consistent with the proximity effect on the Lyman-alpha clouds and the optical depth of intergalactic matter against the ionizing photons satisfy the Gunn-Peterson test for the high-redshift quasars. The evolution of the ionizing flux is also consistent with the evolution law determined by a pressure confinement model of the Lyman-alpha clouds.
No associations
LandOfFree
Intergalactic ionizing flux from active galactic nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Intergalactic ionizing flux from active galactic nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intergalactic ionizing flux from active galactic nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1200311