Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259l...1k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 259, Aug. 1, 1982, p. L1-L5.
Astronomy and Astrophysics
Astrophysics
10
Galactic Structure, Quasars, Red Shift, Gravitation, Radial Distribution, Secular Variations
Scientific paper
The distribution of projected separations between QSOs and bright galaxies is derived, allowing for the sizes of these separations and those of search fields. This distribution is found to be well fitted by the R to the -1/4 distribution characteristic of stellar spheroids and globular cluster systems. This form possesses a scale length comparable to those of the globular cluster systems of the Galaxy and M31. It is noted that if this is not a result of as yet unknown selection effects in optical search procedures, it is strong evidence for a connection between bright galaxies and detectability of QSOs. Gravitational lens models involving amplification of faint QSOs by individual halo stars are capable of explaining this result. Models of this type predict variations in brightness of imaged QSOs with time scales depending on the lens mass. To test the applicability of these models, archival images of 22 QSOs appearing near galaxies are examined. Preliminary inspection reveals no strong variations (1 mag or more) over times as long as 80 years; this is already sufficient to provide interesting constraints on possible lenses.
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