Can secondary infall produce flat rotation curves?

Details Can secondary infall produce flat rotation curves? Can secondary infall produce flat rotation curves?

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..513p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 513-530.

Astronomy and Astrophysics

Astrophysics

15

Astronomical Models, Galactic Evolution, Galactic Rotation, Gravitational Effects, Adiabatic Conditions, Galactic Structure, Halos, Perturbation Theory, Time Response

Scientific paper

The present investigation is concerned with the suggestion made by Gunn (1977) that, with the right initial conditions, dissipationless secondary infall could produce profiles as shallow as 1/(square of r). In connection with 21 cm and optical studies of the rotation curves of disk galaxies, it has been found that extensive regions with a flat or even slightly increasing rotation curve are common. If the mass is spherically distributed, then this implies a density profile proportional to 1/(square of r). The most important result of the current investigation is that numerical simulations of secondary infall do not produce the flat rotation curves which are observed. A simple model of the infall is introduced. This model produces a final density profile but shallower than the numerical simulation's final profile.

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