Is it true that super massive black holes are responsible for the rotation of spiral galaxy's???

Answer 1

They may not be responsible for the origin of the spinning of the galaxies, as I don't think that the black holes were there when the galaxies originated. Most people beleive that in the heart of most galaxies, there is a black hole that sucks matter in the same fashion that water goes down a drain....hence the sprial effect.

Answer 2

Arguments against the proposition
1)Super massive black holes typically have a mass of 10^9 solar masses (basically mass expressed in terms of mass of sun). Typical spiral galaxy has approximately 10^10 to 10^11 stars (and for the sake of argument, assume that they are all of the same mass as that of the sun). In addition, the disk and the bulge of the galaxy is embedded in dark matter (forgoing the arguments based on Modified Newtonian Dynamics). Hence it doesn't look as if, the super massive black hole can create the rotation.
2) The gravitational force due to a super massive black hole is not strong beyond say <1kpc(kilo parsec). Typical sizes of spiral galaxies are of the order of few 10s of kpc.
3) Cosmological simulations doesn't agree with this scenario.
Conclusion: Super massive black holes are not (to a high degree of probability) responsible for galactic rotation.

Possible cause for rotation: Conservation of angular momentum when matter falls into the potential well (caused at very early epoch, signature of which is seen in WMAP)

Answer 3

Now hold that answer! Mater falling into a blak hole rotates around it the same way the planets rotate around the sun. Now consider this, if the Sun rotation is in the same direction that the planetaty orbits in our solar system, then it is conceivable that the rotation of a super masive black hole in the center of our galaxy may induce rotation on the entire galaxy. Remember we are not talking gravity here but magnetic field interaction just the way our orbital plane is flat in relation with the Sun poles.

Answer 4

Here's a scientific test for you. Fill your sink full of water. Put your finger in it, and rotate it in about a 1" circle, either clockwise or counterclockwise. What do you notice? The water, even on the outermost edges of the sink, is effected by the centrifugal motion of the center. So, the black hole, having Gravity, and all of the stars, having lesser gravity, rotating would have a dramatic effect on everything else in a spiral line.

Answer 5

No, but they are responsible for holding it all together and for star formation.

Answer 6

no