A survey of Lyman-limit absorption in the spectra of 59 high-redshift QSOs

Details A survey of Lyman-limit absorption in the spectra of 59 high-redshift QSOs A survey of Lyman-limit absorption in the spectra of 59 high-redshift QSOs

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...69..703s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 69, April 1989, p. 703-761. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

296

Intergalactic Media, Lyman Spectra, Quasars, Red Shift, Signal To Noise Ratios, Emission Spectra, Line Spectra, Lyman Alpha Radiation

Scientific paper

The spectra of 59 QSOs are obtained with emission redshifts in the range z = 2.75-4.11 at a resolution of 4 A in the 3150-4700 A range and 6 A in the 4600-7000 A range. The objects constitute an unbiased sample as far as Lyman-limit detection is concerned. Emission-line equivalent widths and fluxes are listed, and the new data are used to derive emission redshifts. A total of 37 Lyman-limit systems (LLSs) are identified in the 59 QSOs; three QSOs each have two LLSs. All the LLSs have tau at least 1.5. A hazard plot and the Kaplan-Meier estimator are used to show that the distribution of LLSs is Poissonian. The resulting number density as a function of redshift is in a form consistent with either q0 = 0 or 1/2 and no evolution in the properties of the absorbing objects. It is believed that most of the LLSs are produced by galaxies. About two-thirds of the LLSs have associated heavy-element absorption systems, usually identified by the C IV doublet, in these low-resolution spectra.

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