A new examination of absorption line density in the L-alpha forest of QSOs

Details A new examination of absorption line density in the L-alpha forest of QSOs A new examination of absorption line density in the L-alpha forest of QSOs

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.180..113b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 180, no. 1, June 1991, p. 113-131.

Astronomy and Astrophysics

Astrophysics

Absorption Spectra, Lyman Alpha Radiation, Quasars, Emission Spectra, Maximum Likelihood Estimates, Red Shift, Signal To Noise Ratios, Statistical Tests

Scientific paper

A sample of 20 QSO L-alpha forests is studied to determine the density of absorption lines in relation to redshifts for both emission and absorption. The maximum-likelihood method is applied to all the L-alpha forests in the sample as well as to those for individual QSOs to determine the gamma-value of the relation for the number of L-alpha absorption lines at the absorption redshift. It is found that positive and negative gamma-values do not give significantly different results, but the emission redshift of the QSO correlates with absorption-line density. The 'inverse effect' is discussed and concluded to be untenable in light of the results presented.

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