Could Segue 1 be a destroyed star cluster? – a dynamical perspective

We attempt to find a progenitor for the ultrafaint object Segue 1 under the assumption that it formed as a dark matter free star cluster in the past. We look for orbits, using the elongation of Segue 1 on the sky as a tracer of its path. Those orbits are followed backwards in time to find the starti...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2016-10, Vol.461 (4), p.3630-3638
Main Authors: Domínguez, R., Fellhauer, M., Blaña, M., Farias, J. P., Dabringhausen, J., Candlish, G. N., Smith, R., Choque, N.
Format: Article
Language:English
Subjects:
Dark matter
Dynamical systems
Elongation
Mathematical models
Orbits
Simulation
Star & galaxy formation
Star clusters
Symbols
Tracers
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Summary:We attempt to find a progenitor for the ultrafaint object Segue 1 under the assumption that it formed as a dark matter free star cluster in the past. We look for orbits, using the elongation of Segue 1 on the sky as a tracer of its path. Those orbits are followed backwards in time to find the starting points of our N-body simulations. The successful orbit, with which we can reproduce Segue 1 has a proper motion of μα = −0.19 mas yr−1 and μδ = −1.9 mas yr−1, placing Segue 1 near its apogalacticon today. Our best-fitting model has an initial mass of 6224 M⊙ and an initial scalelength of 5.75 pc.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stw1559