Statistics – Computation
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..381a&link_type=abstract
In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19
Statistics
Computation
1
Dark Matter, Galactic Halos, Computational Astrophysics, Density Distribution, Galactic Mass, Galactic Structure, H I Regions, Red Shift
Scientific paper
The requirement that dark galactic halos virialize by the present epoch gives a lower limit to the mean mass density within such objects. In conjunction with observations of HI rotation curves and the virial theorem, this constraint can be used to limit the radial extent and the mass of dark halos. We can use this constraint to calculate the maximum contribution to the density of the Universe made by such halos. Reversing the argument allows us to obtain an upper limit on the formation epoch of dark halos. We find that the halos of spirals formed more recently than a redshift of around 2 to 4 and contribute less than a tenth of the critical density required to close the Universe. Stronger limits are obtained by using estimates of the degree of dissipational gas collapse within dark halos along with observed disk scale-lengths.
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