Could Segue 1 be a destroyed star cluster? - a dynamical perspective
Raul Dominguez (1), Michael Fellhauer (1), Matias Bla\~na (2),, Juan-Pablo Farias (1,4), J\"org Dabringhausen (1), Graeme N. Candlish (1,5),, Rory Smith (3), Nelvy Choque (1) ((1) Departamento de Astronomia, Universidad, de Concepcion, Chile
TL;DR
This study investigates whether Segue 1 could be a former star cluster disrupted by galactic tides, using orbital modeling and N-body simulations to trace its possible origins.
Contribution
It presents a dynamical analysis and orbital reconstruction suggesting Segue 1 may have originated as a dark matter free star cluster, a novel hypothesis for its nature.
Findings
Identified a plausible orbit with specific proper motions.
Reproduced Segue 1's properties with a star cluster model.
Suggested Segue 1 is near its apo-galacticon today.
Abstract
We attempt to find a progenitor for the ultra-faint 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 mu_alpha = -0.19 mas/yr and mu_delta = -1.9 mas/yr, placing Segue 1 near its apo-galacticon today. Our best fitting model has an initial mass of 6224 Msun and an initial scale-length of 5.75 pc.
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