Disk

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Resolving Gas Dynamics in the Circumnuclear Region of a Disk Galaxy in a Cosmological Simulation

December 3, 2007 by Thomas | No comments

Levine et al.
http://arxiv.org/abs/0711.3478
Simulation with high dynamic range (1E7) down to 0.1pc, i.e. to the accretion disk of a SMBH.
Global instabilities make things quasi-stable locally due to turbulence.

An exponential density profile for the gas in a disk arises naturally due to this.

Tags: Black Holes, Disk, Galaxies, Simulation

Wide-Field Survey of Globular Clusters in M31. II. Kinematics of the Globular Cluster System

November 13, 2007 by Thomas | No comments

Lee at al.
http://arxiv.org/abs/0711.1232
The GCs around Andromeda rotate.

GCs can be “friendless”, meaning they have no neighbors with similar kinematics. In addition they look at various subsamples depending e.g. on metallicity and brightness.

Tags: Disk, Galaxies, GC, Kinematics