The spectrum of the QSO 0805 + 046 /4C 05.34/ at intermediate dispersion

Details The spectrum of the QSO 0805 + 046 /4C 05.34/ at intermediate dispersion The spectrum of the QSO 0805 + 046 /4C 05.34/ at intermediate dispersion

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..715c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 715-730.

Astronomy and Astrophysics

Astronomy

34

Line Spectra, Quasars, Stellar Spectra, Stellar Spectrophotometry, Absorption Spectra, Cross Correlation, Lyman Alpha Radiation, Lyman Beta Radiation

Scientific paper

Detailed observations of the spectra of the radio QSO PKS 0805 + 046 (emission-line redshift = 2.8772), obtained with the image photon counting system on the RGO spectrograph at the f/8 Cassegrain focus of a 4-m telescope on February 17, 1977, May 2 and 3, 1978, and February 12 and 13, 1980, are presented. The wavelength scale for the spectra covering the region 3300-6100 A was established with the argon lines of a hollow cathode Cu-Ar discharge. Observational data, the initial reductions, and the establishment and the identification of the absorption lines are presented. Two absorption line systems at absorption-line redshift = 2.87717 are certain, and three more at 1.01422, 0.95915, and 0.70280 are possible; this leaves about 80% of the absorption lines unidentified shortward of Lyman alpha emission and 26% longward. The correlation between Lyman alpha and Lyman beta is considered, and it is concluded that a strong peak in the cross-correlation corresponding to Lyman alpha-Lyman beta pairs and the explicit identification of many of these pairs supports the hypothesis that these lines originate in neutral hydrogen clouds.

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