Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-28
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, Panel paper to be published in IAU Symposium No. 220: Dark Matter in Galaxies, eds. S. Ryder, D.J. Pisano,
Scientific paper
The $\Lambda$CDM scenario to form galaxies encounters many problems when confronted with observations, namely the prediction of dark matter cusps in all galaxies, and in particular in dwarf irregulars, dominated by dark matter, or the low angular momentum and consequent small size of galaxy disks, or the high predicted number of small systems. We will consider the hypothesis that the baryonic dark matter could be in the form of gas and could be continuously involved in the galaxy formation scenario. Through cold gas accretion all along a galaxy life, angular momentum could be increased, galaxy disks could be more dominated by baryons than previously thought, and small systems could merge more frequently.
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