arxiv: 1606.08778 · v1 · pith:7GBIFY6Wnew · submitted 2016-06-28 · 🌌 astro-ph.GA

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)

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Rory Smith (3) Nelvy Choque (1) ((1) Departamento de Astronomia Universidad de Concepcion Chile (2) Max-Planck-Institut f\"ur extraterrestrische Physik Garching Germany (3) Yonsei University Seoul Republic of Corea (4) University of Florida USA (5) Universidad de Valparaiso Chile)

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keywords segueclusterfindinitialorbitsstaralphaapo-galacticon

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

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