This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.
Abstract Details
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Activity Number:
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573
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Type:
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Topic Contributed
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Date/Time:
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Wednesday, August 4, 2010 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Statistical Learning and Data Mining
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| Abstract - #306754 |
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Title:
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Streaming Motion in Leo I
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Author(s):
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Bodhisattva Sen*+
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Companies:
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Columbia University
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Address:
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1255 Amsterdam Avenue, New York, NY, 10027,
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Keywords:
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dwarf spheroidal galaxy ;
streaming motion ;
threshold model ;
tidal radius
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Abstract:
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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 observations from the dwarf spheroidal Leo I [published in Mario, Olszewski, and Walker (2008)]. For Leo I, tidal disruption is detected, at least for stars sufficiently far from the center, but the effect appears to be quite modest.
One can expect the streaming effect to only begin to appear outside a "tidal radius". We propose threshold/change-point models to estimate this tidal radius. We investigate both parametric and nonparametric mis-specifi ed models for estimating the threshold.
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Authors who are presenting talks have a * after their name.
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