3mm-VLBI Observations of the Galactic Center

Details 3mm-VLBI Observations of the Galactic Center 3mm-VLBI Observations of the Galactic Center

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.1214d&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #12.14; Bulletin of the American Astronomical Society, Vol. 27, p.1300

Astronomy and Astrophysics

Astronomy

2

Scientific paper

April 1995 observations with the CMVA (Coordinated Millimeter VLBI Array) at 3mm wavelength have included, for the first time, the BIMA mm array. We have used the BIMA-KittPeak baseline (up to 400Mlambda ) to estimate the size of the compact radio source at the galactic center, Sgr A*. Our results confirm the size found using the smaller OVRO-KittPeak baseline of ~ 0.2mas. This size is consistent with a point source scattered by an screen of ionized material and follows a ~ lambda (2) dependence extrapolated from lower frequency observations. We examine the implications of these results using theoretical models of emission in which the radiation is produced via accretion onto a massive black hole.

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