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- W80492903 abstract "Due to recent technological and scientific advancements, VL BI at 1.3 mm wavelength has matured to a point where observations can readily achieve an angular resolution better than 60 microarcseconds. Using millimetre VLBI arrays, our group has embarked on a project of observing the black holes at the centre of our Galaxy (the 4 million M⊙ Sagittarius A*) and the giant elliptical galaxy M87 on event horizon scales. Our data are consistent with the 1.3 mm emission in Sgr A* coming from a very compact region offset from the black hole, as predicted by general relativistic effects. Within the context of physically-motiva ted models, our long-baseline detections can be used to place constraints on the orientation and spin of the black hole in Sgr A*. A series of observations in April 2009 revealed an increase in the flux de nsity of the compact emitting region in Sgr A* on a timescale of less than a day while the size of the emitting region remained constant. In M87, the size of the emission region obtained from high-frequency VLBI places constraints on the high-energy emission region and may be important for discriminating among models of jet genesis near a black hole. Future improvements to the (sub)millimetre VLBI array will result in a true Event Horizon Telescope Horizon Telescope capable of producing transformative science." @default.
- W80492903 created "2016-06-24" @default.
- W80492903 creator A5041218503 @default.
- W80492903 date "2010-01-01" @default.
- W80492903 modified "2023-09-26" @default.
- W80492903 title "Observing event horizons with high-frequency VLBI" @default.
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