Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0103d&link_type=abstract
American Astronomical Society, HEAD meeting #12, #1.03
Astronomy and Astrophysics
Astronomy
Scientific paper
It is now almost certain that at the center of our Milky Way Galaxy lies a super massive black hole - 4 million times more massive than our Sun. Because of its proximity to Earth, this object, known as Sagittarius A*, presents astronomers with the best opportunity in the Universe to spatially resolve and image a black hole Event Horizon. To do this requires using Very Long Baseline Interferometry (VLBI), the technique whereby radio telescopes around the world are linked together in a Global phased array. Very short wavelength VLBI observations have now confirmed structure on 4 Schwarzschild radius scales within SgrA*, and have revealed time variability in this source on the same spatial scales. Structure of similar size has been observed at the base of the M87 relativistic jet. This presentation will briefly describe the instrumentation efforts that enable these observations, focus on what current and future VLBI observations of SgrA* and M87 tell us about these closest super-massive black holes, and describe plans for assembling a submm-VLBI Event Horizon Telescope.
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