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04/10/2019 – Ephemeris Extra – Event Horizon Telescope reveals the black hole in galaxy M87

11 Apr 2019, 02:32 UTC
04/10/2019 – Ephemeris Extra – Event Horizon Telescope reveals the black hole in galaxy M87
(200 words excerpt, click title or image to see full post)

At 10 a.m. I found the live feed from the National Science Foundation presenting the results of the Event Horizon Telescope. It was one of four simultaneous presentations around the world at that hour. The buzz beforehand was that they would present the image of the black hole in our galaxy Sagittarius A*. It was not. The image presented was of the black hole in the galaxy M87, some 55 million light years away. It turns out that The black hole in M87 is easier to image. Our black hole appears to be too variable in brightness for this first attempt. The M87 black hole has a mass of 6.5 billion times that of our sun. Our black hole has a mass of about 3 million suns. The size of a black hole’s event horizon is proportional to its mass. So the M87 black hole is about 2,000 times larger than our black hole, but about 2,000 times farther away. So they would appear to be the same size on the sky.
The first image of the black hole in M87. Credit Event Horizon Telescope.
The round spot in the center is not a shadow, but the event horizon itself. ...

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