NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris

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DOIResolve DOI: http://doi.org/10.1093/mnras/stv2781
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
1365-2966
Volume456
Issue2
Pages16541665
Subjectdwarf; NGC 147; NGC 185CassII; local group
AbstractNGC 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 observational features of the NGC 147, NGC 185 and CassII satellites. The parameters of these orbits are then used as a starting point for N-body simulations. We present models for which NGC 147, NGC 185 and CassII are a bound group for a total time of at least 1 Gyr but still undergo different interactions with M31 and as a result NGC 147 has a clear stellar stream, whereas the other two satellites have no significant tidal features. This result shows that it is possible to find solutions that reproduce the contrasting properties of the satellites and for which NGC 147-NGC 185-CassII have been gravitationally bound.
Publication date
PublisherOxford University Press
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Astronomy and Astrophysics
Peer reviewedYes
NPARC number23001569
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Record identifierf7940c5b-20ad-4aa8-a214-d12793522568
Record created2017-03-07
Record modified2017-03-30
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