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Satellites of LMC-mass dwarfs: close friendships ruined by Milky Way mass haloes

Deason, A. J. and Wetzel, A. R. and Garrison-Kimmel, S. and Belokurov, V. (2015) Satellites of LMC-mass dwarfs: close friendships ruined by Milky Way mass haloes. Monthly Notices of the Royal Astronomical Society, 453 (4). pp. 3568-3574. ISSN 0035-8711.

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Motivated by the recent discovery of several dwarfs near the Large Magellanic Cloud (LMC), we study the accretion of massive satellites onto Milky Way (MW)/M31-like haloes using the ELVIS suite of N-body simulations. We identify 25 surviving LMC-mass subhaloes, and investigate the lower-mass satellites that were associated with these subhaloes before they fell into the MW/M31 haloes. Typically, 7 per cent of the overall z = 0 satellite population of MW/M31 haloes were in a surviving LMC-group before falling into the MW/M31 halo. This fraction can vary between 1 and 25 per cent, being higher for groups with higher mass and/or more recent infall times. Groups of satellites disperse rapidly in phase space after infall, and their distances and velocities relative to the group centre become statistically similar to the overall satellite population after 4–8 Gyr. We quantify the likelihood that satellites were associated with an LMC-mass group as a function of both distance and velocity relative to the LMC at z = 0. The close proximity in distance of the nine Dark Energy Survey candidate dwarf galaxies to the LMC suggest that ∼2–4 are likely associated with the LMC. Furthermore, if several of these dwarfs are genuine members, then the LMC-group probably fell into the MW very recently, ≲2 Gyr ago. If the connection with the LMC is established with follow-up velocity measurements, these ‘satellites of satellites’ represent prime candidates to study the effects of group pre-processing on lower mass dwarfs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Deason, A. J.0000-0001-6146-2645
Wetzel, A. R.0000-0003-0603-8942
Garrison-Kimmel, S.0000-0002-4655-8128
Belokurov, V.0000-0002-0038-9584
Alternate Title:Satellites of LMCs: Close Friendships Ruined by Milky Way Mass Halos
Additional Information:© 2015 The Royal Astronomical Society. Accepted 2015 August 18. Received 2015 July 13; in original form 2015 May 12. First published online September 9, 2015. AJD is currently supported by NASA through Hubble Fellowship grant HST-HF-51302.01, awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. ARW gratefully acknowledges support from the Moore Center for Theoretical Cosmology and Physics at Caltech. We thank an anonymous referee for providing useful comments on the paper.
Group:Moore Center for Theoretical Cosmology and Physics, TAPIR
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF-51302.01
Caltech Moore Center for Theoretical Cosmology and PhysicsUNSPECIFIED
Subject Keywords:Galaxy: formation, Galaxy: halo, galaxies: dwarf, galaxies: Magellanic Clouds
Issue or Number:4
Record Number:CaltechAUTHORS:20150422-111317757
Persistent URL:
Official Citation:A. J. Deason, A. R. Wetzel, S. Garrison-Kimmel, and V. Belokurov Satellites of LMC-mass dwarfs: close friendships ruined by Milky Way mass haloes MNRAS (November 11, 2015) Vol. 453 3568-3574 doi:10.1093/mnras/stv1939 First published online September 9, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56875
Deposited By: Ruth Sustaita
Deposited On:22 Apr 2015 19:00
Last Modified:09 Mar 2020 13:18

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