High-resolution VLBA imaging of the radio source SGR A* at the Galactic Centre

Details High-resolution VLBA imaging of the radio source SGR A* at the Galactic Centre High-resolution VLBA imaging of the radio source SGR A* at the Galactic Centre

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.362...38l&link_type=abstract

Nature (ISSN 0028-0836), vol. 362, no. 6415, p. 38-40.

Astronomy and Astrophysics

Astronomy

34

Black Holes (Astronomy), Galactic Nuclei, Radio Sources (Astronomy), Very Long Base Interferometry, Accretion Disks, Electron Density (Concentration), Power Spectra, Sagittarius Constellation, Stellar Winds

Scientific paper

Images of Sgr* A with milliarcsecond resolution obtained by using five telescopes of the partially completed Very Long Baseline Array (VLBA) in conjunction with a few additional telescopes are presented. The image of Sgr A* at a wavelength of 3.6 cm confirms almost exactly the elliptical Gaussian model that has been proposed on the basis of previous data. The source size at 1.34 cm wavelength is 2.4 +/- 0.2 mas, similar to previous results. At both wavelengths, the radio source is smooth, without detectable fine structure. These observations support the suggestion that the radio emission from Sgr A* is strongly scattered by electron-density fluctuations along the line of sight. On the assumption that the emission is due to a black hole accreting stellar winds from massive stars in the central 0.5 pc, the observations are consistent with a black hole mass of less than about 2 million solar masses.

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