The Lyman-alpha forest in the quasar B2 1225 + 317 from 3140 A to 3940 A

Details The Lyman-alpha forest in the quasar B2 1225 + 317 from 3140 A to 3940 A The Lyman-alpha forest in the quasar B2 1225 + 317 from 3140 A to 3940 A

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1140b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Nov. 1986, p. 1140-1146.

Astronomy and Astrophysics

Astronomy

2

Absorption Spectra, Lyman Alpha Radiation, Quasars, Ultraviolet Spectra, Metallicity, Red Shift, Spectral Line Width

Scientific paper

The authors have obtained a spectrum of the quasar B2 1225+317 from 3140 Å to 3940 Å using the new "UV prime" spectrograph at the 3.6-m CFH telescope. A signal-to-noise ratio larger than 25 was achieved with an exposure of only 90 minutes using an RCA CCD. They produce a new line list of the Lyman-alpha forest that is complete to about 0.15 Å rest equivalent width. They confirm that the number density of the Lα lines increases steeply for rest equivalent widths smaller than 0.20 Å as suggested by previous workers. The new equipment is very suited for quick quasar survey and in particular for a Mg II search at z < 0.40.

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