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#1 2022-05-12 07:32:47

Registered: 2006-03-23
Posts: 4,782

Sag A* has been imaged?

Astronomers Reveal First Ever Image of the Milky Way's Black Hole … lack-hole/

How the Event Horizon Telescope takes pictures of black holes … lack-holes

See The Jaw-Dropping First Image Of The Black Hole ‘Enigma’ At The Heart Of Our Galaxy Just Revealed By Astronomers … tronomers/

Sagittarius A* "Sagittarius A-Star" is a bright and very compact astronomical radio source at the Galactic Center of the Milky Way. It is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, visually close to the Butterfly Cluster (M6) and Shaula. Sagittarius A* is the location of a supermassive black hole, similar to massive objects at the centers of most, if not all, spiral and elliptical galaxies. Observations of several stars orbiting Sagittarius A*, particularly star S2, have been used to determine the mass and upper limits on the radius of the object. Based on mass and increasingly precise radius limits, astronomers have concluded that Sagittarius A* is the Milky Way's central supermassive black hole. The current value of its mass is slightly in excess of 4 million solar masses. On 12 May 2022, astronomers announced the image, for the first time, of Sagittarius A*. In 2017, direct radio images were taken of Sagittarius A* and M87* by the Event Horizon Telescope.The Event Horizon Telescope uses interferometry to combine images taken from widely spaced observatories at different places on Earth in order to gain a higher picture resolution. In July 2018, it was reported that S2 orbiting Sgr A* had been recorded at 7,650 km/s (17.1 million mph), or 2.55% the speed of light, leading up to the pericenter approach, in May 2018, at about 120 AU (18 billion km; 11 billion mi) (approximately 1,400 Schwarzschild radii) from Sgr A*. At that close distance to the black hole, Einstein's theory of general relativity (GR) predicts that S2 would show a discernible gravitational redshift in addition to the usual velocity redshift; the gravitational redshift was detected, in agreement with the GR prediction within the 10 percent measurement precision.

'First Successful Test of Einstein’s General Relativity Near Supermassive Black Hole'

Sagittarius A* has been imaged for the first time … 3666031617

'These are two distinct blackholes'

Last edited by Mars_B4_Moon (2022-05-12 07:41:54)


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