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Tidal stirring of Milky Way satellites: a simple picture with the integrated tidal force


Łokas, E L; Kazantzidis, S; Mayer, L; Callegari, S (2011). Tidal stirring of Milky Way satellites: a simple picture with the integrated tidal force. In: Ferreras, I; Pasquali, A. Environment and the formation of galaxies: 30 years later : Proceedings of Symposium 2 of JENAM 2010. Berlin, DE: Springer, 229-234.

Abstract

Most of dwarf spheroidal galaxies in the Local Group were probably formed via environmental processes like the tidal interaction with the Milky Way. We study this process via N-body simulations of dwarf galaxies evolving on seven different orbits around the Galaxy. The dwarf galaxy is initially composed of a rotating stellar disk and a dark matter halo. Due to the action of tidal forces it loses mass and the disk gradually transforms into a spheroid while stellar motions become increasingly random. We measure the characteristic scale-length of the dwarf, its maximum circular velocity, mass, shape and kinematics as a function of the integrated tidal force along the orbit. The final properties of the evolved dwarfs are remarkably similar if the total tidal force they experienced was the same, independently of the actual size and eccentricity of the orbit.

Abstract

Most of dwarf spheroidal galaxies in the Local Group were probably formed via environmental processes like the tidal interaction with the Milky Way. We study this process via N-body simulations of dwarf galaxies evolving on seven different orbits around the Galaxy. The dwarf galaxy is initially composed of a rotating stellar disk and a dark matter halo. Due to the action of tidal forces it loses mass and the disk gradually transforms into a spheroid while stellar motions become increasingly random. We measure the characteristic scale-length of the dwarf, its maximum circular velocity, mass, shape and kinematics as a function of the integrated tidal force along the orbit. The final properties of the evolved dwarfs are remarkably similar if the total tidal force they experienced was the same, independently of the actual size and eccentricity of the orbit.

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Additional indexing

Item Type:Book Section, not refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:November 2011
Deposited On:19 Feb 2012 19:33
Last Modified:05 Apr 2016 15:21
Publisher:Springer
Series Name:Astrophysics and Space Science Proceedings
ISSN:1570-6591 (P) 1570-6605 (E)
ISBN:978-3-642-20284-1 (P) 978-3-642-20285-8 (ebook)
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:https://doi.org/10.1007/978-3-642-20285-8
Related URLs:http://opac.nebis.ch/F/?local_base=NEBIS&CON_LNG=GER&func=find-b&find_code=SYS&request=006578260
http://arxiv.org/abs/1011.3357

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