Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-19
Astrophys.J.696:701-705,2009
Astronomy and Astrophysics
Astrophysics
10 pages, 1 figure
Scientific paper
10.1088/0004-637X/696/1/701
The existence of a massive black hole in the center of the Milky Way, coinciding with the radio source Sgr A*, is being established on more and more solid ground. In principle, this black hole, acting as a gravitational lens, is able to bend the light emitted by stars moving within its neighborhood, eventually generating secondary images. Extending a previous analysis of the gravitational lensing phenomenology to a new set of 28 stars, whose orbits have been well determined by recent observations, we have calculated all the properties of their secondary images, including time and magnitude of their luminosity peaks and their angular distances from the central black hole. The best lensing candidate is represented by the star S6, since the magnitude of its secondary image at the peak reaches K=20.8, with an angular separation of 0.3 mas from the central black hole, that is just at the borders of the resolution limit in the K band of incoming astronomical instruments.
Bozza Valerio
Mancini Luigi
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