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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-41702

Lokas, E L; Kazantzidis, S; Klimentowski, J; Mayer, L (2009). Biases in mass estimates of dSph galaxies. In: Hunting for the Dark: the Hidden Side of Galaxy Formation, Qawra, Malta, 19 October 2009 - 23 October 2009, 363-366.

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Using a high resolution N-body simulation of a two-component dwarf galaxy orbiting in the potential of the Milky Way, we study two effects that lead to significant biases in mass estimates of dwarf spheroidal galaxies. Both are due to the strong tidal interaction of initially disky dwarfs with their host. The tidal stripping of dwarf stars leads to the formation of strong tidal tails that are typically aligned with the line of sight of an observer positioned close to the host center. The stars from the tails contaminate the kinematic samples leading to a velocity dispersion profile increasing with the projected radius and resulting in an overestimate of mass. The tidal stirring of the dwarf leads to the morphological transformation of the initial stellar disk into a bar and then a spheroid. The distribution of stars in the dwarf remains non-spherical for a long time leading to an overestimate of its mass if it is observed along the major axis and an underestimate if it seen in the perpendicular direction.




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Item Type:Conference or Workshop Item (Paper), not refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Event End Date:23 October 2009
Deposited On:03 Mar 2011 13:44
Last Modified:05 Apr 2016 14:33
Publisher:American Institute of Physics
Series Name:AIP Conference Proceedings
ISSN:0094-243X (P) 1551-7616 (E)
Publisher DOI:10.1063/1.3458535
Related URLs:http://arxiv.org/abs/arXiv:1003.5560
http://www.star.uclan.ac.uk/malta2009/index.shtml (Organisation)

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