QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift

Details QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343l..33s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. L33-L35.

Statistics

Computation

54

Absorption Spectra, Computational Astrophysics, Lyman Alpha Radiation, Quasars, Red Shift, Ultraviolet Spectra, Active Galactic Nuclei, Astronomical Models, Heavy Elements, Photoionization, Spectral Energy Distribution

Scientific paper

Given that the observed QSOs cannot account for the intensity of the metagalactic ultraviolet flux at high redshift, the possible contribution from early-type stars in young or forming galaxies is examined. Based on the observed ionization state of heavy element absorption systems in the spectra of QSOs, and using photoionization models, arguments are presented which appear to rule out the possibility that early-type stars in young or forming galaxies are dominating the metagalactic ultraviolet flux up to a redshift of at least z about 4. Specifically, the stellar contribution cannot be more than comparable to the AGN contribution, and thus it appears that unaccounted-for sources of ionizing radiation which have spectral energy distributions similar to those of AGNs must be present at high redshifts.

Affiliated with

Also associated with

No associations

Rating

QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift 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 QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and QSO heavy element absorption systems and the nature of the metagalactic ionizing flux at high redshift will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1515006