ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Rotational motions of twin quasar images due to the motion of a gravitational lens galaxy are studied. A weak gravity field and a point mass lens are assumed. Twin images of a quasar appear and rotate when a lens galaxy passes near a straight line connecting the observer with the quasar. The positions and velocities of the quasar images are calculated using various sets of parameters. Conclusions: (1) Quasar images move a few hundred milli-arc-seconds per year or more, if the lens galaxy passes within a thousandth parsec from the line connecting the observer with the quasar, (2) the distance between the galactic center and the quasar images is about ten kilo-parsec at the most. As an example, the velocities of 0957+561 A, B1 and B2 are calculated. Even the fastest case, they are 1.5, 1.8, and 1.6×10−5 milli-arc-second per year, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00648853
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