The luminosities of backsplash galaxies in constrained simulations of the Local Group
Entity
UAM. Departamento de Física TeóricaPublisher
Oxford University Press; Royal Astronomical SocietyDate
2011-03-01Citation
10.1111/j.1365-2966.2010.17924.x
Monthly Notices of the Royal Astronomical Society 412.1 (2011): 529-536
ISSN
0035-8711; 1365-2966DOI
10.1111/j.1365-2966.2010.17924.xFunded by
AK is supported by the Ministerio de Ciencia e Innovación (MICINN) in Spain through the Ramón y Cajal programme and further acknowledges support by the Ministerio de Education (MEC) grant AYA 2009-13875- C03-02. SRK acknowledges support by the MICINN too under the Consolider-Ingenio, SyeC project CSD- 2007 -00050.We acknowledge support of MICINN through the Consolider-Ingenio 2010 Programme under grant MULTIDARK CSD2009-00064. GYacknowledges financial support from MEC (Spain) under project AYA 2009-13875- C03-02 and the ASTROMADRID project financed by Comunidad de MadridProject
Comunidad de Madrid. S2009/ESP-1496/ASTROMADRIDEditor's Version
http://dx.doi.org/10.1111/j.1365-2966.2010.17924.xSubjects
Cosmology: theory; Galaxies: formation; Galaxies: haloes; Methods: numerical; FísicaNote
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2010 RAS © 2010 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Rights
© 2010 RAS; © 2010 The AuthorsAbstract
We study the differences and similarities in the luminosities of bound, infalling and the so-called backsplash galaxies of the Milky Way and M31 using a hydrodynamical simulation performed within the Constrained Local UniversE Simulation (CLUES) project. The simulation models the formation of the Local Group within a self-consistent cosmological framework. We find that even though backsplash galaxies passed through the virial radius of their host halo and hence may have lost a (significant) fraction of their mass, their stellar populations are hardly affected. This leaves us with comparable luminosity functions for infalling and backsplash galaxies and hence little hope to decipher their past (and different) formation and evolutionary histories by luminosity measurements alone. Nevertheless, due to the tidal stripping of dark matter we find that the mass-to-light ratios have changed when comparing the various populations against each other: they are highest for the infalling galaxies and lowest for the bound satellites with the backsplash galaxies in between
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Google Scholar:Knebe, Alexander
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Libeskind, Noam I.
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Knollmann, Steffen R.
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Martinez-Vaquero, Luis A.
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Yepes Alonso, Gustavo
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Gottlöber, Stefan
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Hoffman, Yehuda
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