Could Segue 1 be a destroyed star cluster? - a dynamical perspective
| Autor: | Michael Fellhauer, Rory Smith, N. Choque, M. Blaña, Juan P. Farias, J. Dabringhausen, Graeme Candlish, R. Domínguez |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Best fitting Proper motion 010308 nuclear & particles physics media_common.quotation_subject Dark matter Astronomy FOS: Physical sciences Astronomy and Astrophysics Segue Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Perspective (geometry) Star cluster Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Orbit (dynamics) 010303 astronomy & astrophysics media_common |
| DOI: | 10.48550/arxiv.1606.08778 |
| Popis: | 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. Comment: 9 pages, 5 figures, 3 tables, accepted by MNRAS |
| Databáze: | OpenAIRE |
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