Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1461y&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Dec. 1987, p. 1461-1468.
Astronomy and Astrophysics
Astronomy
37
Galactic Structure, Quasars, Red Shift, Spectrum Analysis, Statistical Analysis, Radio Spectra, Seyfert Galaxies, Stellar Activity, Stellar Luminosity
Scientific paper
Using imaging data from a relatively complete subset of low-redshift radio-quiet quasars, the frequency of finding associated companion galaxies of the quasars is determined statistically. With an average completeness limit of Mr of about -19, it is found that about 40 percent of the quasars have at least one close physical companion within a projected distance of 100 kpc. The percentage of quasars with detected companions is consistent with all quasars in the sample having a companion of luminosity brighter than about -16.5 mag. It is estimated that the frequency of finding close companions to quasars is about six times higher than that expected for field galaxies. This frequency is similar to that found for lower-luminosity Seyfert galaxies. The properties of the companions appear to be uncorrelated with the level of activity in the quasars. This suggests that, for radio-quiet quasars, the companions act mainly as triggers of the activity and are probably not a strong determining factor of the detailed properties of the quasars.
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