Stability of Galactic Gas Disks and the Formation of Massive Clusters

Details Stability of Galactic Gas Disks and the Formation of Massive Clusters Stability of Galactic Gas Disks and the Formation of Massive Clusters

2008-06-04

arxiv.org/abs/0806.0853v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures, submitted to ApjL

Scientific paper

10.1086/592271

We study gravitational instabilities in disks, with special attention to the most massive clumps that form because they are expected to be the progenitors of globular-type clusters. The maximum unstable mass is set by rotation and depends only on the surface density and orbital frequency of the disk. We propose that the formation of massive clusters is related to this largest scale in galaxies not stabilized by rotation. Using data from the literature, we predict that globular-like clusters can form in nuclear starburst disks and protogalactic disks but not in typical spiral galaxies, in agreement with observations.

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