Gravitational lensing by globular clusters and dwarf galaxies-- the explanation of quasar-galaxy associations

Details Gravitational lensing by globular clusters and dwarf galaxies-- the explanation of quasar-galaxy associations Gravitational lensing by globular clusters and dwarf galaxies-- the explanation of quasar-galaxy associations

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnts...4..205y&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 4, p. 205-208

Physics

Scientific paper

Quasar-galaxy associations can be explained as gravitational lensing by globular clusters, located in the halos of the foreground galaxies and dwarf galaxies in small groups of galaxies. We propose an observational test for checking this hypothesis. We used the SUPERCOSMOS sky survey to find the overdensities of star-like sources with zero proper motions in the vicinities of the~foreground galaxies from the CfA3 catalog. The results obtained for 19413 galaxies are presented. We show the results of calculations of number densities of star-like sources with zero proper motions in the vicinity of 19413 galaxies. Two different effects can explain the observational data: lensing by globular clusters and lensing by dwarf galaxies. We carried out the CCD 3-color photometry with the 2.0-m telescope of the~Terskol Observatory and the 1.8-m telescope of the Bohyunsan Observatory (South Korea) to select extremely lensed objects around several galaxies for future spectroscopic observations.
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