NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris
Veronica Arias, Magda Guglielmo, Nuwanthika Fernando, Geraint F Lewis, Joss Bland-Hawthorn, Nicholas F Bate, Anthony Conn, Mike J Irwin, Annette MN Ferguson, Rodrigo A Ibata, Alan W McConnachie, Nicolas Martin
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2016
NGC 147, NGC 185 and Cassiopeia II (CassII) have similar positions in the sky, distances and measured line-of-sight velocities. This proximity in phase space suggests that these three satellites of M31 form a subgroup within the Local Group. Nevertheless, the differences in their star formation history and interstellar medium, and the recent discovery of a stellar stream in NGC 147, combined with the lack of tidal features in the other two satellites, are all indications of complex and diverse interactions between M31 and these three satellites. We use a genetic algorithm to explore the different orbits that these satellites can have and select six sets of orbits that could best explain the ..View full abstract
Awarded by Australian research council
Awarded by Science and Technology Facilities Council
MG acknowledges the Australia Postgraduate Award (APA) for supporting her PhD candidature and the Astronomical Society of Australia for its travel support. NF acknowledges the Dean's International Post Graduate Scholarship of the Faculty of Science, University of Sydney. GFL thanks the Australian research council for support through his Future Fellowship (FT100100268), and he and NFB acknowledge support through the Discovery Project (DP110100678).