SIMBAD references

2016ApJ...826L..21S - Astrophys. J., 826, L21-L21 (2016/August-1)

Long-lived spiral structure for galaxies with intermediate-size bulges.


Abstract (from CDS):

Spiral structure in disk galaxies is modeled with nine collisionless N-body simulations including live disks, halos, and bulges with a range of masses. Two of these simulations make long-lasting and strong two-arm spiral wave modes that last for ∼5 Gyr with constant pattern speed. These two had a light stellar disk and the largest values of the Toomre Q parameter in the inner region at the time the spirals formed, suggesting the presence of a Q-barrier to wave propagation resulting from the bulge. The relative bulge mass in these cases is about 10%. Models with weak two-arm spirals had pattern speeds that followed the radial dependence of the Inner Lindblad Resonance.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: bulges - galaxies: evolution - galaxies: halos - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure

Simbad objects: 1

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