Sagittarius A

Sgr A* , the location , the source , a supermassive black hole dying deep at the center of the MILKY WAY galaxy , our very own galaxy . Sgr A * (in full form Sagittarius A ) is known to be the one of the mysteries of our own region . Our very own sun is spinning with the solar system around it. What a special way to describe this black hole, 'The Sun of the Milky Way.'

It has a mass of (4.154±0.014)×106 Solar mass ( 4 million times of the mass of sun, 'Supermassive, Yeah') , distance about 26673±42 light-year(from earth, approax.) , Right ascension of 17h 45m 40.0409s ,

When NASA's Chandra X-ray Observatory monitored Sgr A* continuously for 164 hours in 2003, it detected weak X-rays flaring up and quieting down a half-dozen times. The cause of these flares — which occur at or near the event horizon — is still a mystery, but probably results from high-speed atoms spiraling inward to their doom. Meanwhile, huge lobes of ultra-hot gas stream away from opposite sides of the black hole and extend for dozens of light-years, a sign of larger explosive emissions over the past 10,000 years. Without a doubt, Sgr A* is a starved black hole. These days, it doesn't capture anything much. Perhaps a previous eating frenzy created so much energy that it blew its neighborhood clear of material. Without much violence going on, the surest way to study Sagittarius A* is to see how it yanks nearby objects around. In the past few years, astronomers have focused on 28 stars wildly whirling around this black hole. One passed just 10 light-hours from Sgr A* in 2000. Another heavy blue star named S2 caught the full attention of researchers because it's so close that it completes its highly elliptical orbit of the black hole in just 15.6 years. Astronomers have now watched it continuously during most of one orbit. In 2002, S2 passed within 17 light-hours (about three times the distance between the Sun and Pluto) of the black hole's event horizon. Its speed told us the mass of the object it orbits, while the fact that it survived put an upper limit on the black hole's dimensions. The star would have had to venture 70 times closer to be destroyed. Altogether, S2 clinched or helped refine many things that astronomers have long believed. Sagittarius A* is real, and its mass is exactly 4.1 million Suns. in an article that appeared in 1951 in an Australian scientific journal almost unknown in the West. In the article's abstract, you can read:

A new "discrete source" of peculiar spectrum was discovered very close to the centre of the Galaxy. Evidence suggests that the power output of this and some other sources in the radio spectrum may exceed the total power output of the Sun.

(SOURCE - https://en.wikipedia.org/wiki/Sagittarius_A*

https://md64.medium.com/the-history-of-the-discovery-of-sgr-a-11b6658f8ab8

- https://www.space.com/milky-way-monster-black-hole-cool-disk.html)