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March 2009 Streaming motion in Leo I
Bodhisattva Sen, Moulinath Banerjee, Michael Woodroofe, Mario Mateo, Matthew Walker
Ann. Appl. Stat. 3(1): 96-116 (March 2009). DOI: 10.1214/08-AOAS211


Whether a dwarf spheroidal galaxy is in equilibrium or being tidally disrupted by the Milky Way is an important question for the study of its dark matter content and distribution. This question is investigated using 328 recent observations from the dwarf spheroidal Leo I. For Leo I, tidal disruption is detected, at least for stars sufficiently far from the center, but the effect appears to be quite modest. Statistical tools include isotonic and split point estimators, asymptotic theory, and resampling methods.


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Bodhisattva Sen. Moulinath Banerjee. Michael Woodroofe. Mario Mateo. Matthew Walker. "Streaming motion in Leo I." Ann. Appl. Stat. 3 (1) 96 - 116, March 2009.


Published: March 2009
First available in Project Euclid: 16 April 2009

zbMATH: 1160.62367
MathSciNet: MR2668701
Digital Object Identifier: 10.1214/08-AOAS211

Keywords: Asymptotic distributions , bootstrap , change point models , dark matter , dwarf spheroidal galaxies , isotonic estimation , permutation tests , split points

Rights: Copyright © 2009 Institute of Mathematical Statistics


Vol.3 • No. 1 • March 2009
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