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The Magellanic group and the seven dwarfs


D'Onghia, E; Lake, G (2009). The Magellanic group and the seven dwarfs. In: Van Loon, J T; Oliveira, J M. The Magellanic system: stars, gas, and galaxies. Cambridge: Cambridge University Press, 473-478.

Abstract

The Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. This group, dominated by the LMC, contained ~4% of the mass of the Milky Way prior to its accretion and tidal disruption, but ≈70% of the known dwarfs orbiting the MW. Our theory addresses many outstanding problems in galaxy formation associated with dwarf galaxies. First, it can explain the planar orbital configuration populated by some dSphs in the MW. Second, it provides a mechanism for lighting up a subset of dwarf galaxies to reproduce the cumulative circular velocity distribution of the satellites in the MW. Finally, our model predicts that most dwarfs will be found in association with other dwarfs. The recent discovery of Leo V (Belokurov et al. 2008), a dwarf spheroidal companion of Leo IV, and the nearby dwarf associations supports our hypothesis.

Abstract

The Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. This group, dominated by the LMC, contained ~4% of the mass of the Milky Way prior to its accretion and tidal disruption, but ≈70% of the known dwarfs orbiting the MW. Our theory addresses many outstanding problems in galaxy formation associated with dwarf galaxies. First, it can explain the planar orbital configuration populated by some dSphs in the MW. Second, it provides a mechanism for lighting up a subset of dwarf galaxies to reproduce the cumulative circular velocity distribution of the satellites in the MW. Finally, our model predicts that most dwarfs will be found in association with other dwarfs. The recent discovery of Leo V (Belokurov et al. 2008), a dwarf spheroidal companion of Leo IV, and the nearby dwarf associations supports our hypothesis.

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Additional indexing

Contributors:International Astronomical Union
Item Type:Book Section, not_refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Galaxy: halo, galaxies: clusters: general, galaxies: formation, galaxies: halos, Magellanic Clouds, cosmology: observations, dark matter
Language:English
Date:2009
Deposited On:27 Feb 2010 15:31
Last Modified:12 Sep 2018 07:01
Publisher:Cambridge University Press
Series Name:IAU Symposium Proceedings Series
Number:4
ISSN:1743-9213 (P) 1743-9221 (E)
ISBN:978-0-521-88987-2
Additional Information:Proceedings of the 256th symposium of the International Astronomical Union, held at Keele University, United Kingdom, July 28-August 1, 2008
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1017/S1743921308028883
Related URLs:http://opac.nebis.ch/F/?local_base=NEBIS&con_lng=GER&func=find-b&find_code=SYS&request=005787715

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