The absorption-line spectrum of GC 1556 + 335 - Ejected or intervening material?

Details The absorption-line spectrum of GC 1556 + 335 - Ejected or intervening material? The absorption-line spectrum of GC 1556 + 335 - Ejected or intervening material?

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310...40m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 40-52. SERC-NATO-supported research.

Astronomy and Astrophysics

Astrophysics

45

Absorption Spectra, Astronomical Spectroscopy, Galactic Clusters, Quasars, Astronomical Models, Kinetic Energy, Line Spectra, Red Shift, Velocity Distribution

Scientific paper

Two rich C IV absorption complexes in the radio-loud QSO GC 1556 + 335 are described. Column densities for seven of the redshift systems in these complexes are measured, and limits on the distances between the QSO and absorbing clouds are derived using ionization parameters estimated from matching photoionization models to the observations and a density estimated from an upper limit to the C II(asterisk) column density in the z = 1.65367 redshift system. These limits show that GC 1556 + 335 is not a typical member of the BALQSO class. Two alternative models are discussed in which the absorption complexes are caused by material either entrained into a radio jet from the QSO or contained in two clusters of galaxies along the line of sight. It is suggested that the emission associated with the complexes may be detectable, and that a study of the velocity field and geometry of such emission might be decisive in determining the mechanism responsible for the absorption.

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