Nature of the z(a) approximately equal to z(e) absorption line systems in the QSOs PKS 1912-54 and PKS 2135-14

Details Nature of the z(a) approximately equal to z(e) absorption line systems in the QSOs PKS 1912-54 and PKS 2135-14 Nature of the z(a) approximately equal to z(e) absorption line systems in the QSOs PKS 1912-54 and PKS 2135-14

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168....6b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 6-16.

Astronomy and Astrophysics

Astrophysics

14

Absorption Spectra, Astronomical Spectroscopy, Galactic Clusters, Line Spectra, Quasars, Visible Spectrum, Charge Coupled Devices, Data Reduction, Gas Ionization, Red Shift, Spectral Line Width, Ultraviolet Radiation

Scientific paper

To test the intervening galaxy cluster assumption for the za ≡ ze absorption line systems observed in QSO spectra, the authors have studied two such systems at low redshift in PKS 1912-54 (ze = 0.401) and PKS 2135-14 (ze = 0.200). They obtained optical spectra of these QSOs to get the velocity dispersion and ionic column densities of the absorbers, and CCD images to search directly for a cluster of galaxies at z ≡ ze and compare its properties with those of clusters associated with QSOs without known za ≡ ze absorption systems. For PKS 2135-14 a single cloud of moderate density and small size, belonging to either the galaxy underlying the QSO or the companion galaxy, accounts well for the absorption line spectrum. For the system in PKS 1912-54 two phases should be present: a small cloud, probably associated with the nearest neighbor galaxy, and an extended diffuse region of low density and high ionization level.

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