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Hi Robert,
Is there any computer genrated images of M31 that provide a more 'face on' illustration of the galaxy? Might give some insight to the physics involved if we can see the distribution of the arms around the core.
Might there be some images of M31 using other wavelengths that may pick up any jetisoned material? Again, this may also give some insight to the gravitational tidal distortion you've mentioned.
If my memory serves me right, even our Milky Way isn't vinyl record flat either. The Magellanic Clouds are seeing to that, and there is also residual material around the MM from other 'recent' mergings with smaller galaxies.
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