The properties of the object in the Galaxy Centre (Sgr A*) is said to be associated with a Super Massive Black Hole. There are several likely features of a black hole in a matter rich environment like the Galaxy Centre.
1. A large accretion disc.
It has a disc but the matter seems to be spiralling away and not inward, so no accretion and not a black hole.
2. Bright in the x-ray.
It seems remarkably dull - may be it is obscured - yet these cores are no more odious in any other galaxy. There should be comparisons to similar really big black hole like entities called quasars - the brightest objects in the Universe. These galaxy cores have no association in emissions to quasars and are as different as black and white.
3. Flare with variations in accretion.
This object appears uniformly obscure and mysterious.
4. Compact.
All black holes are fully compact - it’s part of what they are. This thing is semi-compact and so not a black hole.
5. Rotation speed.
Black holes are the product of collapse which implants rotation. This galaxy core has been difficult to determine the rotation. Some calculate this to be very rapid from the speed of material around it. I suggest it’s hardly moving and that the object, the bar of stars and the whole bulge are going around at that slow rotation.
6. Mass.
The only entity we know that can become this massive are black holes. Which assumes we know about every object in the Universe which we don’t.
One object that is theorised by relativity to be a white hole, which have unknown properties, may better describe the Central Object and associations to galaxy evolution - being connected to a black hole elsewhere. Read more at: relativegalaxy.blogspot.com
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