Gravitational lensing by a massive black hole at the Galactic center

Details Gravitational lensing by a massive black hole at the Galactic center Gravitational lensing by a massive black hole at the Galactic center

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387l..65w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 387, March 10, 1992, p. L65-L68.

Astronomy and Astrophysics

Astronomy

26

Black Holes (Astronomy), Galactic Nuclei, Gravitational Lenses, Milky Way Galaxy, Star Clusters, Infrared Stars, Radio Astronomy, Stellar Luminosity, Very Long Base Interferometry

Scientific paper

The manifestations of gravitational lensing by a massive black hole at the Galactic center, with particular attention given to lensing of stars in the stellar cluster that lie behind Sgr A*, and of Sgr A east, a nonthermal extended radio source which is known with certainty to lie behind the Galactic center. Lensing of the stellar cluster produces a deficit of stellar images within 10 mas of the center, and a surplus between 30 and 300 mas. The results suggest that the proper motion of the stars will produce brightness variations of stellar images on a time scale of a few years or less. Both images of such a source should be visible, and will rise and fall in luminosity together.

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