Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cha%26a..13..241b&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 13, Issue 3, p. 241-249.
Astronomy and Astrophysics
Astrophysics
Qsos, Absorption Lines, Emission Redshifts
Scientific paper
Following our previous paper [1] we here re-examine the correlation between the absorption line density in Lα forests N(Zabs) and the emission redshift Zem using a sample of 15 QSOs with medium to high redshifts with Lα forests. The present sample covers a greater range in redshift than [1], the emission redshifts ranging between 1.715 and 3.780, and the absorption redshifts between 1.501 and 3.780. The statistical method used also differs somewhat. Results of analysis show once again that N(Zabs) clearly depends on Zem, not only in the sense that the mean density over the entire forest is the greater for greater zem, but more importantly in the sense that the density over a given range of Zabs increases with increasing Zem. This last result poses serious difficulty for the current ``intervening hypothesis'' for the origin of the absorption lines.
Bian Yulin
Chen Jiansheng
Zou Zhenlong
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