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dc.contributor.author
Snaith, O. N.
dc.contributor.author
Gibson, B. K.
dc.contributor.author
Brook, C. B.
dc.contributor.author
Knebe, A.
dc.contributor.author
Thacker, R. J.
dc.contributor.author
Quinn, T. R.
dc.contributor.author
Governato, F.
dc.contributor.author
Tissera, Patricia Beatriz
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dc.date.available
2017-07-04T20:18:03Z
dc.date.issued
2012-09-21
dc.identifier.citation
Snaith, O. N.; Gibson, B. K.; Brook, C. B.; Knebe, A.; Thacker, R. J.; et al.; The halo shape and evolution of polar disc galaxies; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 425; 3; 21-9-2012; 1967-1979
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/19529
dc.description.abstract
We examine the properties and evolution of a simulated polar disc galaxy. This galaxy is comprised of two orthogonal discs, one of which contains old stars (old stellar disc), and the other, containing both younger stars and the cold gas (polar disc) of the galaxy. By exploring the shape of the inner region of the dark matter halo, we are able to confirm that the halo shape is a oblate ellipsoid flattened in the direction of the polar disc. We also note that there is a twist in the shape profile, where the innermost 3 kpc of the halo flattens in the direction perpendicular to the old disc, and then aligns with the polar disc out until the virial radius. This result is then compared to the halo shape inferred from the circular velocities of the two discs. We also use the temporal information of the simulation to track the system’s evolution, and identify the processes which give rise to this unusual galaxy type. We confirm the proposal that the polar disc galaxy is the result of the last major merger, where the angular moment of the interaction is orthogonal to the angle of the infalling gas. This merger is followed by the resumption of coherent gas infall. We emphasis that the disc is rapidly restored after the major merger and that after this event the galaxy begins to tilt.A significant proportion of the infalling gas comes from filaments. This infalling gas from the filament gives the gas its angular momentum, and, in the case of the polar disc galaxy, the direction of the gas filament does not change before or after the last major merger.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Galaxy Formation
dc.subject
Galaxy Evolution
dc.subject
Cosmology
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The halo shape and evolution of polar disc galaxies
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-04T14:08:58Z
dc.journal.volume
425
dc.journal.number
3
dc.journal.pagination
1967-1979
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Snaith, O. N.. University of Central Lancashire; Reino Unido
dc.description.fil
Fil: Gibson, B. K.. University of Central Lancashire; Reino Unido
dc.description.fil
Fil: Brook, C. B.. University of Central Lancashire; Reino Unido
dc.description.fil
Fil: Knebe, A.. Universidad Autónoma de Madrid; España
dc.description.fil
Fil: Thacker, R. J.. Saint Mary’s University; Canadá
dc.description.fil
Fil: Quinn, T. R.. University of Washington; Estados Unidos
dc.description.fil
Fil: Governato, F.. University of Washington; Estados Unidos
dc.description.fil
Fil: Tissera, Patricia Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/425/3/1967/981599/The-halo-shape-and-evolution-of-polar-disc?searchresult=1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1206.5570
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