How faithful are N-body simulations of disc galaxies?

Details How faithful are N-body simulations of disc galaxies? How faithful are N-body simulations of disc galaxies?

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..799r&link_type=abstract

Astronomy and Astrophysics 286, 799-806 (1994)

Astronomy and Astrophysics

Astrophysics

45

Instabilities, Methods: Numerical, Ism: Kinematics And Dynamics, Galaxies: Ism, Galaxies: Kinematics And Dynamics, Galaxies: Spiral

Scientific paper

High-softening two-dimensional models, frequently employed in N-body experiments, do not provide faithful simulations of real galactic discs. A prescription [Eqs. (17) and (18)] is given for choosing meaningful values of the softening length in standard regimes of astrophysical interest, when both the stellar and gaseous components are present. In addition, a stability criterion [Eq. (10); see also Eq. (11)] is given for choosing meaningful input values of the Toomre parameter for a given softening length. Such a criterion should also provide a key to the correct interpretation of computational results in terms of real phenomena.

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