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TriAnd and its siblings: satellites of satellites in the Milky Way halo

Deason, A.J.; Belokurov, V.; Hamren, K.M.; Koposov, S.E.; Gilbert, K.M.; Beaton, R.L.; Dorman, C.E.; Guhathakurta, P.; Majewski, S.R.; Cunningham, E.C.

TriAnd and its siblings: satellites of satellites in the Milky Way halo Thumbnail


Authors

V. Belokurov

K.M. Hamren

S.E. Koposov

K.M. Gilbert

R.L. Beaton

C.E. Dorman

P. Guhathakurta

S.R. Majewski

E.C. Cunningham



Abstract

We explore the Triangulum–Andromeda (TriAnd) overdensity in the SPLASH (Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo) and SEGUE (the Sloan Extension for Galactic Understanding and Exploration) spectroscopic surveys. Milky Way main-sequence turn-off stars in the SPLASH survey reveal that the TriAnd overdensity and the recently discovered Pan-Andromeda Archaeological Survey (PAndAS) stream share a common heliocentric distance (D ∼ 20 kpc), position on the sky, and line-of-sight velocity (VGSR ∼ 50 km s−1). Similarly, A-type, giant, and main-sequence turn-off stars selected from the SEGUE survey in the vicinity of the Segue 2 satellite show that TriAnd is prevalent in these fields, with a velocity and distance similar to Segue 2. The coincidence of the PAndAS stream and Segue 2 satellite in positional and velocity space to TriAnd suggests that these substructures are all associated, and may be a fossil record of group-infall on to the Milky Way halo. In this scenario, the Segue 2 satellite and PAndAS stream are ‘satellites of satellites’, and the large, metal-rich TriAnd overdensity is the remains of the group central.

Citation

Deason, A., Belokurov, V., Hamren, K., Koposov, S., Gilbert, K., Beaton, R., …Cunningham, E. (2014). TriAnd and its siblings: satellites of satellites in the Milky Way halo. Monthly Notices of the Royal Astronomical Society, 444(4), 3975-3985. https://doi.org/10.1093/mnras/stu1764

Journal Article Type Article
Acceptance Date Aug 25, 2014
Online Publication Date Sep 18, 2014
Publication Date Sep 18, 2014
Deposit Date Feb 20, 2017
Publicly Available Date Jan 18, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 444
Issue 4
Pages 3975-3985
DOI https://doi.org/10.1093/mnras/stu1764
Related Public URLs http://adsabs.harvard.edu/abs/2014MNRAS.444.3975D

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Copyright Statement
© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.





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