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Date and Time of the Query: 2019-05-25 T19:57:49 PDT
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For refcode 2001ARep...45..581B:
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NED Abstract

Copyright by American Institute of Physics. 2001ARep...45..581B Properties of Quasar-Galaxy Associations and Gravitational Mesolensing by Halo Objects Yu. L. Bukhmastova St. Petersburg State University, St. Petersburg, Russia Received November 14, 2000 Abstract - A new catalog of 8382 close quasar-galaxy pairs is presented. The catalog was composed using published catalogs of quasars and active galactic nuclei containing 11 358 objects, as well as the LEDA catalog of galaxies, which contains on the order of 100 thousand objects. Based on these new data, the dependence of the number of pairs on a = z_G_/z_Q_ is analyzed, where z_G_ and z_Q_ are the redshifts of the galaxy and quasar, respectively, revealing an excess of pairs with a < 0.1 and a > 0.9. This means that the galaxies in pairs are preferably located close to either the observer or the quasar and avoid intermediate distances along the line of sight to the quasar. Computer simulations demonstrate that it is not possible to explain this number of pairs with the observed distribution in a as the result of chance positional coincidences with a uniform spatial distribution of galaxies. Data on globular clusters show that the excess of pairs with a < 0.1 and a > 0.9 is consistent with the hypothesis that we are observing distant compact objects that are strongly gravitationally lensed by transparent lenses with a King mass distribution located in the halos of nearby galaxies. The Hubble diagram for galaxies and quasars is presented. Observational tests of the mesolensing hypothesis are formulated.
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