NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris
| Autor: | Nuwanthika Fernando, Annette M. N. Ferguson, Nicolas F. Martin, Rodrigo A. Ibata, Anthony R. Conn, Nicholas F. Bate, Geraint F. Lewis, Alan W. McConnachie, Veronica Arias, Magda Guglielmo, Joss Bland-Hawthorn, Mike Irwin |
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| Přispěvatelé: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2015 |
| Předmět: |
dwarf [galaxies]
Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject FOS: Physical sciences NGC 147 Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences individual: NGC 185 [galaxies] local group NGC 185CassII 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS Astrophysics::Galaxy Astrophysics individual: NGC 147 [galaxies] dwarf media_common Physics individual: CassII [galaxies] Line-of-sight 010308 nuclear & particles physics Star formation Astronomy Local Group numerical [methods] Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Debris Interstellar medium [SDU]Sciences of the Universe [physics] Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) Phase space |
| Zdroj: | Arias, V, Guglielmo, M, Fernando, N, Lewis, G F, Bland-Hawthorn, J, Bate, N F, Conn, A, Irwin, M J, Ferguson, A M N, Ibata, R A, McConnachie, A W & Martin, N 2016, ' NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris ', Monthly Notices of the Royal Astronomical Society, vol. 456, no. 2, pp. 1654-1665 . https://doi.org/10.1093/mnras/stv2781 Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2015, 456 (2), pp.1654-1665. ⟨10.1093/mnras/stv2781⟩ |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stv2781 |
| Popis: | NGC147, NGC185 and CassiopeiaII (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 NGC147, NGC185 and CassII satellites. The parameters of these orbits are then used as a starting point for N-body simulations. We present models for which NGC147, NGC185 and CassII are a bound group for a total time of at least one Gyr but still undergo different interactions with M31 and as a result NGC147 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 NGC147-NGC185-CassII have been gravitationally bound. Comment: Accepted for publication on MNRAS. 12 pages, 9 figures |
| Databáze: | OpenAIRE |
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