A computer-generated galaxy model with long-lived two-armed spiral structure

Details A computer-generated galaxy model with long-lived two-armed spiral structure A computer-generated galaxy model with long-lived two-armed spiral structure

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356l...9t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 356, June 10, 1990, p. L9-L13. Research supported by the Wilhelm

Other

27

Astronomical Models, Computerized Simulation, Galactic Evolution, Galactic Structure, Spiral Galaxies, Disk Galaxies, Galactic Bulge, Interstellar Matter, Many Body Problem

Scientific paper

A long-lived two-armed spiral has been generated in an N-body computer simulation of a galaxy with a static bulge and halo and an active disk composed of 60,000 particles. The spiral lasts for about three pattern revolutions without severe distortion and persists for at least two more revolutions with distortions and bifurcations resulting from an increasingly clumpy ISM. This suggests that two-armed grand design spirals in nonbarred noninteracting galaxies can be long-lived if star formation and other heat sources not present in the simulation maintain a steady interstellar medium.

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