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

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DOI	Resolve DOI: https://doi.org/10.1093/mnras/stv2781
Author	Search for: Arias, Veronica; Search for: Guglielmo, Magda; Search for: Fernando, Nuwanthika; Search for: Lewis, Geraint F.; Search for: Bland-hawthorn, Joss; Search for: Bate, Nicholas F.; Search for: Conn, Anthony; Search for: Irwin, Mike J.; Search for: Ferguson, Annette M. N.; Search for: Ibata, Rodrigo A.; Search for: Mcconnachie, Alan W.¹; Search for: Martin, Nicolas
Name affiliation	National Research Council of Canada. Herzberg Astronomy and Astrophysics
Format	Text, Article
Journal title	Monthly Notices of the Royal Astronomical Society
ISSN	0035-8711 1365-2966
Volume	456
Issue	2
Pages	1654–1665
Subject	dwarf; NGC 147; NGC 185CassII; local group
Abstract	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 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	2016-02-21
Publisher	Oxford University Press
Language	English
Peer reviewed	Yes
NPARC number	23001569
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Record identifier	f7940c5b-20ad-4aa8-a214-d12793522568
Record created	2017-03-07
Record modified	2020-05-30

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Date modified:: 2020-07-12