CfA Colloquium Schedule Fall 2008
 20 November 2008

20 November 2008

Speaker: Shep Doeleman (MIT / Haystack)

Title: Approaching the event horizon: submm-VLBI of SgrA*

Abstract: There is now very strong evidence that SgrA*, the compact source of radio, IR, and x-ray emission at the Galactic Center, marks the position of a 4 million solar mass black hole. VLBI observations in April 2007 at a wavelength of 1.3mm have now confirmed structure in SgrA* on scales of just a few Schwarzschild radii. More sensitive observations, using additional VLBI stations, are planned over the next few years, and will be sensitive to time variable structures predicted by models of flaring activity in SgrA*. I will describe the instrumentation efforts that enable these observations, and discuss what current and future VLBI observations of SgrA* tell us about this closest super-massive black hole.

Video of the Presentation (Talks can be viewed with RealPlayer. Free download is available from )


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