Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-07-23
Astronomy and Astrophysics
Astrophysics
Revised version; 6 pages, 2 figures, to appear in MNRAS
Scientific paper
10.1046/j.1365-8711.1999.02814.x
If dark halos are composed of dense gas clouds, as has recently been inferred, then collisions between clouds lead to galaxy evolution. Collisions introduce a core in an initially singular dark matter distribution, and can thus help to reconcile scale-free initial conditions -- such as are found in simulations -- with observed halos, which have cores. A pseudo-Tully-Fisher relation, between halo circular speed and visible mass (not luminosity), emerges naturally from the model: visible mass proportional to V^3.5. Published data conform astonishingly well to this theoretical prediction. For our sample of galaxies, the mass-velocity relationship has much less scatter than the Tully-Fisher relation, and holds as well for dwarf galaxies (where diffuse gas makes a sizeable contribution to the total visible mass) as it does for giants. It seems very likely that this visible-mass/velocity relationship is the underlying physical basis for the Tully-Fisher relation, and this discovery in turn suggests that the dark matter is both baryonic and collisional.
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