Computer Science
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16..336z&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 4, p. 336-345
Computer Science
1
Scientific paper
We study the motion of the image centroid (IC) of a remote source microlensed by moving stochastic point gravitators of a lensing galaxy. The source is supposed to have a centrally symmetrical brightness distribution. The investigation is carried out for the zero shear case on the basis of direct numerical calculations for optical densities up to σ˜ 0.5 and analytically in the approximation σ≪1. This approximation enables us to reveal qualitative features of the problem due to masses far away from the line of sight and a finite source size. Semianalytical and numerical estimates of the mean velocity and the r.m.s. velocity of the IC we are obtained for the isotropic distribution of gravitator velocity and for the case when all gravitator velocities are the same, i. e., when the lensing galaxy moves as a whole. The estimates show that characteristic IC velocities for a source with an angular size of the order of the Einstein ring may be comparable to the proper transverse motion of the typical lensing galaxy.
Aleksandrov A. N.
Salata S. A.
Zhdanová V. I.
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