The Morphology and Pattern Speed of Spiral Structure

Type Conference Paper
Names D. Nelson, E. D'Onghia, L. Hernquist
Conference Name Advances in Computational Astrophysics: Methods, Tools, and Outcome
Volume 453
Pages 369
Date July 1, 2012
ISBN 1050-3390
Library Catalog
Abstract We consider the spiral structure arising from the gravitational influence of massive perturbers corotating in a stellar disk. Within a single rotation period our simulations develop a prominent, large-scale response, covering a broad range of spiral galaxy morphologies. In contrast, identical systems in the absence of perturbers show no such features. Measuring radial variation of the spiral pattern speed ╬ęp using a modified Tremaine-Weinberg method, we find that the pattern speed both decreases with radius and closely follows the circular velocity of the disk.
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