A spectroscopic study of selected quasars with absorption redshifts greater than emission redshifts

Details A spectroscopic study of selected quasars with absorption redshifts greater than emission redshifts A spectroscopic study of selected quasars with absorption redshifts greater than emission redshifts

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..619w&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 619-631.

Astronomy and Astrophysics

Astrophysics

35

Absorption Spectra, Emission Spectra, Intergalactic Media, Quasars, Red Shift, Distribution Functions, Galactic Clusters, Luminous Intensity, Spectrum Analysis

Scientific paper

Spectroscopic data are presented for seven quasars having absorption systems whose redshift is greater than that of emission lines. The objects examined include PKS 1229-02, 3C 298, 3C 205, B194, PHL 1222, 0736-06, and PKS 0119-04. The redshift systems of each quasar are described in detail, the empirical distribution of the relative numbers of absorption systems vs. emission-absorption redshift difference is determined, and errors in this distribution due to selection of the sample and to the incompleteness and inhomogeneity of the data are discussed qualitatively. Six groups of possibilities are considered for the origin of absorption systems with redshifts higher than the emission redshifts. It is concluded that two separate mechanisms must be invoked: intervening clouds bound in a cluster of galaxies where the quasar is embedded (for systems with an absolute relative velocity not exceeding about 3000 km/s) and gravitational acceleration of material ejected by the quasar (for systems with a relative velocity of at least 3000 km/s).

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