- #1
Zman
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On galaxy rotation curves, the velocities of stars (or gas) rotating about their galactic centre remain fairly constant as the distance from the galactic centre increases.
But these rotation curves show a drop in rotation velocity towards the centre of the galaxy.
http://astro.berkeley.edu/~mwhite/darkmatter/rotcurve.html"
I accept that at the centre the rotation velocity must be zero but just out from the centre, Kepler’s third law predicts that the velocities should be greatest and then fall off with increasing distance.
Does this velocity profile exist because the centre of galaxies up to about 6kpc (in the hyperlinked curve) are a bit like a solid mass?
But these rotation curves show a drop in rotation velocity towards the centre of the galaxy.
http://astro.berkeley.edu/~mwhite/darkmatter/rotcurve.html"
I accept that at the centre the rotation velocity must be zero but just out from the centre, Kepler’s third law predicts that the velocities should be greatest and then fall off with increasing distance.
Does this velocity profile exist because the centre of galaxies up to about 6kpc (in the hyperlinked curve) are a bit like a solid mass?
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