Direct Measurements of Black Holes with the Event Horizon Telescope

Details Direct Measurements of Black Holes with the Event Horizon Telescope Direct Measurements of Black Holes with the Event Horizon Telescope

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4002f&link_type=abstract

American Astronomical Society, HEAD meeting #12, #40.02

Astronomy and Astrophysics

Astronomy

Scientific paper

The Event Horizon Telescope (EHT) is an array of existing (sub)millimeter telescopes that uses the technique of Very Long Baseline Interferometry (VLBI) to achieve angular resolutions measured in tens of microarcseconds. For the super massive black hole in the Galactic Center (Sgr A*) and in the elliptical galaxy M87, the EHT has detected emission on the scale of the event horizon. In this presentation we describe details of measurements already made with the EHT. We also describe future observations that will allow us to probe orbits of the accretion disk around the black hole in Sgr A* in a manner that is complementary to information obtained from X-ray observations. Emission models of Sgr A* that include the strong gravitational lensing near the black hole indicate that future high-frequency VLBI observations may lead to tests of the "no-hair" theorem, which states that a black hole may be completely characterized by its mass and spin.

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