mm/submm VLBI of SgrA*

Details mm/submm VLBI of SgrA* mm/submm VLBI of SgrA*

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21321001d&link_type=abstract

American Astronomical Society, AAS Meeting #213, #210.01; Bulletin of the American Astronomical Society, Vol. 41, p.282

Astronomy and Astrophysics

Astronomy

Scientific paper

Advances in VLBI instrumentation now allow wideband recording that significantly increases the sensitivity of short wavelength VLBI observations. VLBI at wavlengths <1.3mm enables observations of SgrA*, the super-massive black hole candidate at the center of the Milky Way, that pierce the ionized ISM that scatters longer wavelengths and broadens radio images of the Galactic Center. This technique yields angular resolutions that are comparable to the apparent size of the event horizon of the black hole. Recent VLBI observations at 1.3mm on a three station VLBI array have confirmed structure in SgrA* on scales of just a few Schwarzschild radii. This talk will summarize these observations and describe how technical efforts already underway will increase the sensitivity of these VLBI observations by an order of magnitude and extend VLBI to wavelengths as short as 0.8mm. Over the next few years, these high angular resolution VLBI observations will provide a new way to study fundamental parameters of the super-massive black hole in the Galactic Center.

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