The redshift distribution of Ly-alpha clouds and the proximity effect

Details The redshift distribution of Ly-alpha clouds and the proximity effect The redshift distribution of Ly-alpha clouds and the proximity effect

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367...19l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 19-36. Research supported by the Zaccheus Daniel Fou

Astronomy and Astrophysics

Astrophysics

196

Line Spectra, Lyman Alpha Radiation, Quasars, Red Shift, Absorption Spectra, Heavy Elements, Proximity, Stellar Luminosity

Scientific paper

A relatively homogeneous sample of 950 Ly-alpha forest lines has been formed from 38 QSO spectra. A redshift index gamma of 2.37 + or - 0.26 is found to describe the evolution of the Ly-alpha forest clouds if the data are parameterized by a single power law. A more relativistic value for gamma of 2.75 + or - 0.29, however, is obtained when the proximity effect is taken into consideration. It is confirmed that there is indeed statistically significant evidence for the inverse effect in the sense that there are fewer lines near QSO emission redshifts. The inverse effect can be explained as a proximity effect caused by the enhanced ionization of hydrogen clouds due to the nearby QSO, provided that the clouds are highly ionized. The background mean intensity at z between 1.7 and 3.8 is estimated to be -21.0 + or - 0.5. No significant correlation is found between the proximity effect and the radio properties of the QSOs. Explanations for the inverse effect are discussed.

Affiliated with

Also associated with

No associations

Rating

The redshift distribution of Ly-alpha clouds and the proximity effect 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 The redshift distribution of Ly-alpha clouds and the proximity effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The redshift distribution of Ly-alpha clouds and the proximity effect will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1894907