It needs to be arranged radially symmetrically in the plane of the specific galaxy so as to not warp the outer regions of the disk, or spherically symmetric to do the same.
Galaxies 'feel' the dark matters gravity and we see the effect in the rotation rate in the periphery of the specific galaxies, but not in warpage of the disk, so asymmetrical distribution above (or below) (so to speak) the median plane of the galaxy would be ruled out. If the gravity is sufficient to explain the rotation speeds we see, it would be sufficient to distort the galaxy vertically.
We see some spiral galaxies that are warped, but we generally see them interacting with another visible galactic structure in their vicinity. 2 galaxies with symmetrically distributed clouds of dark matter would not together have a symmetrical distribution while they were in close proximity as between them the dark matter halos would overlap.
Galaxies 'feel' the dark matters gravity and we see the effect in the rotation rate in the periphery of the specific galaxies, but not in warpage of the disk, so asymmetrical distribution above (or below) (so to speak) the median plane of the galaxy would be ruled out. If the gravity is sufficient to explain the rotation speeds we see, it would be sufficient to distort the galaxy vertically.
We see some spiral galaxies that are warped, but we generally see them interacting with another visible galactic structure in their vicinity. 2 galaxies with symmetrically distributed clouds of dark matter would not together have a symmetrical distribution while they were in close proximity as between them the dark matter halos would overlap.
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