Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.118..487s&link_type=abstract
(IAU, Asian-Pacific Regional Meeting, 3rd, Kyoto, Japan, Sept. 30-Oct. 5, 1984) Astrophysics and Space Science (ISSN 0004-640X),
Astronomy and Astrophysics
Astronomy
8
Abundance, Galaxies, Quasars, Radio Sources (Astronomy), Red Shift, Cross Correlation, Morphology, Seyfert Galaxies
Scientific paper
Investigations of the large-scale environment of QSOs have been concerned with observations of associated galaxy groups, broad band imaging and spectroscopy of the faint extended luminous material immediately surrounding QSOs, and the use of the extended radio structure as a probe of the intergalactic medium. The first indication that QSOs were not completely isolated was the discovery of a companion galaxy to PKS 2251 + 113 by Gunn (1971). Questions regarding the existence of a statistically significant excess of galaxies in QSO fields over that expected by change have been studied. Host galaxies, close companions, and extended emission regions are considered along with the qualitative evidence that many of the extended emission-line regions owe their origin to interactions or mergers. A speculative overview is also provided.
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