Upper Limit of 3.3 Astronomical Units to the Diameter of the Galactic Center Radio Source Sgr A^*

Details Upper Limit of 3.3 Astronomical Units to the Diameter of the Galactic Center Radio Source Sgr A^* Upper Limit of 3.3 Astronomical Units to the Diameter of the Galactic Center Radio Source Sgr A^*

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...262.1414b&link_type=abstract

Science, Volume 262, Issue 5138, pp. 1414-1416

Astronomy and Astrophysics

Astronomy

34

Scientific paper

Sagittarius (Sgr) A* is a unique radio source located at the center of our galaxy. The radiation from Sgr A* may be generated in matter accreting onto a massive black hole. In observations at long wavelengths, the apparent angular size of Sgr A* decreases in the manner expected for emission from a point source scattered by electron density fluctuations along the line of sight. Measurements at a wavelength of 7 millimeters with the nearly completed Very Long Baseline Array indicate a size of 0.7 milliarc seconds, which is consistent with an extrapolation from results at longer wavelengths. The true size of Sgr A* must be less than 0.4 milliarc seconds, or 3.3 astronomical units. The inferred black hole mass is less than 1.5 x 10^6 solar masses according to a recent model for the emission.

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