Compression of dark halos by baryon infall - Self-similar solutions

Details Compression of dark halos by baryon infall - Self-similar solutions Compression of dark halos by baryon infall - Self-similar solutions

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370...15r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 15-24.

Statistics

Computation

11

Baryons, Computational Astrophysics, Dark Matter, Galactic Structure, Halos, Adiabatic Conditions, Astronomical Models, Density Distribution

Scientific paper

The compression of dissipationless halos by dissipative baryon infall is examined through the use of self-similar models. The models are spherically symmetric, with asymptotic density profiles of given form. A fraction f of the matter consists of freely falling baryons; the remainder of the matter, consisting of dark matter with initial dispersion anisotropy beta is gravitationally compressed by the infalling baryons. Analytic results are presented in the limiting cases f = 1 and f = 0. Numerical results are given for halos with varying values of alpha, beta, and f. The compression of the dark matter is found to be adiabatic and has a Mach number less than 1 throughout the halo.

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