2016/06/28 by Raimundo Domínguez, Raul Dominguez, Michael Fellhauer +11 · 11 citations
Physics and Astronomy · #Astronomy #Astrophysics #Cluster (spacecraft) #Dark matter #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Orbit (dynamics) #Perspective (graphical) #Physics #Proper motion #Sky #Stars #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1093/mnras/stw1559
published in Monthly Notices of the Royal Astronomical Society 461(4), 3630-3638 (Oxford University Press) · 9 pages, 5 figures, 3 tables, accepted by MNRAS
arxiv created 2016/06/28 · openalex publication_date 2016/06/30 · arxiv updated 2016/08/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.