Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477l..79m&link_type=abstract
Astrophysical Journal Letters v.477, p.L79
Astronomy and Astrophysics
Astronomy
76
Galaxies: Evolution, Galaxies: Interactions, Galaxies: Kinematics And Dynamics, Galaxies: Spiral, Galaxies: Starburst, Galaxies: Structure
Scientific paper
Using analytic stability criteria we demonstrate that, because of their low surface mass density and large dark matter content, low surface brightness (LSB) disks are quite stable against the growth of global nonaxisymmetric modes such as bars. However, depending on their (poorly constrained) stellar velocity dispersions, they may be only marginally stable against local instabilities. We simulate a collision between an LSB and a high surface brightness (HSB) galaxy and find that, while the HSB galaxy forms a strong bar, the response of the LSB disk is milder, manifesting weaker rings and spiral features. The lack of sufficient disk self-gravity to amplify dynamical instabilities naturally explains the rarity of bars in LSB disks. The stability of LSB disks may also inhibit interaction-driven gas inflow and starburst activity in these galaxies.
de Blok J. G. W.
McGaugh Stacy S.
Mihos James Christopher
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