On the relevance of chaos for halo stars in the solar neighbourhood
We show that diffusion due to chaotic mixing in the neighbourhood of the Sun may not be as relevant as previously suggested in erasing phase space signatures of past Galactic accretion events. For this purpose, we analyse solar neighbourhood-like volumes extracted from cosmological simulations that...
| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2015
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93614 https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stv1778 https://arxiv.org/abs/1508.00579 |
| Aporte de: |
| id |
I19-R120-10915-93614 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía Física Ciencias Naturales Ciencias Exactas Chaos Difffusion Numerical methods Evolution of the Galaxy Galaxy |
| spellingShingle |
Astronomía Física Ciencias Naturales Ciencias Exactas Chaos Difffusion Numerical methods Evolution of the Galaxy Galaxy Maffione, Nicolás Pablo Gomez, F. A. Cincotta, Pablo Miguel Giordano, Claudia Marcela Cooper, A. P. O'Shea, B. W. On the relevance of chaos for halo stars in the solar neighbourhood |
| topic_facet |
Astronomía Física Ciencias Naturales Ciencias Exactas Chaos Difffusion Numerical methods Evolution of the Galaxy Galaxy |
| description |
We show that diffusion due to chaotic mixing in the neighbourhood of the Sun may not be as relevant as previously suggested in erasing phase space signatures of past Galactic accretion events. For this purpose, we analyse solar neighbourhood-like volumes extracted from cosmological simulations that naturally account for chaotic orbital behaviour induced by the strongly triaxial and cuspy shape of the resulting dark matter haloes, among other factors. In the approximation of an analytical static triaxial model, our results show that a large fraction of stellar halo particles in such local volumes have chaos onset times (i.e. the time-scale at which stars commonly associated with chaotic orbits will exhibit their chaotic behaviour) significantly larger than a Hubble time. Furthermore, particles that do present a chaotic behaviour within a Hubble time do not exhibit significant diffusion in phase space. |
| format |
Articulo Articulo |
| author |
Maffione, Nicolás Pablo Gomez, F. A. Cincotta, Pablo Miguel Giordano, Claudia Marcela Cooper, A. P. O'Shea, B. W. |
| author_facet |
Maffione, Nicolás Pablo Gomez, F. A. Cincotta, Pablo Miguel Giordano, Claudia Marcela Cooper, A. P. O'Shea, B. W. |
| author_sort |
Maffione, Nicolás Pablo |
| title |
On the relevance of chaos for halo stars in the solar neighbourhood |
| title_short |
On the relevance of chaos for halo stars in the solar neighbourhood |
| title_full |
On the relevance of chaos for halo stars in the solar neighbourhood |
| title_fullStr |
On the relevance of chaos for halo stars in the solar neighbourhood |
| title_full_unstemmed |
On the relevance of chaos for halo stars in the solar neighbourhood |
| title_sort |
on the relevance of chaos for halo stars in the solar neighbourhood |
| publishDate |
2015 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93614 https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stv1778 https://arxiv.org/abs/1508.00579 |
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AT maffionenicolaspablo ontherelevanceofchaosforhalostarsinthesolarneighbourhood AT gomezfa ontherelevanceofchaosforhalostarsinthesolarneighbourhood AT cincottapablomiguel ontherelevanceofchaosforhalostarsinthesolarneighbourhood AT giordanoclaudiamarcela ontherelevanceofchaosforhalostarsinthesolarneighbourhood AT cooperap ontherelevanceofchaosforhalostarsinthesolarneighbourhood AT osheabw ontherelevanceofchaosforhalostarsinthesolarneighbourhood |
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Repositorios |
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