Do Black Holes rotate with the galaxy or do they remain where they have been formed?

Question

Our galaxy rotes every 230,000,000 years if black holes are as dense as we believe and of unimaginable weight could the gravitational forces which rotate the galaxy be strong enough to pull any black holes with it?

Answer 1

Black holes exist throughout our galaxy. From a distance, their gravity is the same as any other object of equal mass. They are also subject to the effect of gravity from other stars and indeed the whole of the Milky Way as any other object. There are likely hordes of stellar mass black holes in the disk of the galaxy formed by massive stars exploding as supernovae and hypernovae, leaving behind a core so massive it immediately implodes into the black hole state. They orbit the center of the galaxy like the other stars do, and when they encounter each other and other stars, their orbits change as they gain or lose speed with respect to the galactic center. The super massive black hole in the very center of the galaxy probably was always there, at least since the last collision between the Milky Way and another galaxy. Most galaxies of any size do have a central black hole, and when two such galaxies merge, the supper massive black holes spiral towards each other and merge into an even bigger black hole. Out galaxy rotates, and the stars, gas and dust clouds, free floating planetst and black holes too are taken along for the ride.

Answer 2

Black holes are locally very weird objects. Very steep gravitational fields; very strong tidal effect, etc.

However, once you keep them at a distance, they are only mass.

We are presently in orbit around the Sun and it takes us a little over 365 days to go all the way around.

If you were to replace the Sun with a black hole that has exactly the same mass as the Sun, and leave us exactly at the same distance, then it would still take us a little over 365 days to get around. And, together, we'd still take 230 million years to go around the Galaxy.

However, it would be dark and cold on Earth.

Answer 3

They still are subject to all normal forces of gravity and would orbit. Remember, the center of our galaxy probably has a black hole that is millions of solar masses. Most black holes out in the galaxy won't be nearly that big, there just isn't enough mass near them to feed them.

Answer 4

Short answer is that they rotate with the galaxy just like a star.

Black holes do not have to be of unimaginable mass. Only unimaginable density. If a mass is small enough in size it can have unimaginable density even if it is only 1 kilogram of mass.

Answer 5

Black holes react to gravity just like everything else, and they orbit around the galaxy just like anything else with the same mass.

They also react to electric fields, if they have a charge; most BH's have some electric charge on them.

It fact, there are only 3 qualities that we can observe about a BH: mass, electric charge, and spin. (And position and velocity, of course).

But ... most BH's have an "accretion disk" around them, and this can have all types of wonderful properties. But that's a story for another time.

Answer 6

Yes! All objects in a gravitational system orbit their combined center of mass. The same goes for black holes.

Answer 7

They're like any other star - it has mass, it's affected by gravity, and - if it's formed moving at a certain speed & direction, will maintain that speed & direction (for the most part; the explosion may have altered it's vector a little.)

Answer 8

I think it remains at same place. Because it is a place where everything turns into energy, so i think that gravitational force should not be acting on it

Answer 9

it is stagnant in the universe. it has its owm.