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Snaith, O.N.; Gibson, B.K.; Brook, C.B.; Knebe, A.; Thacker, R.J.; Quinn, T.R.; Governato, F.; Tissera, P.B. "The halo shape and evolution of polar disc galaxies" (2012) Monthly Notices of the Royal Astronomical Society. 425(3):1967-1979
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Abstract:

We examine the properties and evolution of a simulated polar disc galaxy. This galaxy is composed of two orthogonal discs, one of which contains old stars (old stellar disc) and the other both younger stars and cold gas (polar disc). By exploring the shape of the inner region of the dark matter halo, we are able to confirm that the halo shape is an 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 3kpc 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 emphasize 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. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

Registro:

Documento: Artículo
Título:The halo shape and evolution of polar disc galaxies
Autor:Snaith, O.N.; Gibson, B.K.; Brook, C.B.; Knebe, A.; Thacker, R.J.; Quinn, T.R.; Governato, F.; Tissera, P.B.
Filiación:Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, United Kingdom
Instituto de Astronomía y Física del Espacio, Conicet-UBA, CC67, Suc. 28, Ciudad de Buenos Aires, 1428, Argentina
GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot, 5 Place Jules Janssen, Meudon, F-92195, France
Department of Astronomy and Physics, Saint Mary's University, Halifax, NS, B3H 3C3, Canada
Monash Centre for Astrophysics, School of Mathematical Sciences, Monash University, Clayton, VIC, 3800, Australia
Grupo de Astrofiísica, Depatamento de Fisica Teorica, Universidad Autónoma de Madrid, Cantoblanco, E-280049, Spain
Department of Astronomy, University of Washington, Seattle, WA, 98195, United States
Palabras clave:Galaxies: evolution; Galaxies: formation; Galaxies: haloes; Galaxies: interactions; Galaxies: structure
Año:2012
Volumen:425
Número:3
Página de inicio:1967
Página de fin:1979
DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v425_n3_p1967_Snaith

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Citas:

---------- APA ----------
Snaith, O.N., Gibson, B.K., Brook, C.B., Knebe, A., Thacker, R.J., Quinn, T.R., Governato, F.,..., Tissera, P.B. (2012) . The halo shape and evolution of polar disc galaxies. Monthly Notices of the Royal Astronomical Society, 425(3), 1967-1979.
http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
---------- CHICAGO ----------
Snaith, O.N., Gibson, B.K., Brook, C.B., Knebe, A., Thacker, R.J., Quinn, T.R., et al. "The halo shape and evolution of polar disc galaxies" . Monthly Notices of the Royal Astronomical Society 425, no. 3 (2012) : 1967-1979.
http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
---------- MLA ----------
Snaith, O.N., Gibson, B.K., Brook, C.B., Knebe, A., Thacker, R.J., Quinn, T.R., et al. "The halo shape and evolution of polar disc galaxies" . Monthly Notices of the Royal Astronomical Society, vol. 425, no. 3, 2012, pp. 1967-1979.
http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
---------- VANCOUVER ----------
Snaith, O.N., Gibson, B.K., Brook, C.B., Knebe, A., Thacker, R.J., Quinn, T.R., et al. The halo shape and evolution of polar disc galaxies. Mon. Not. R. Astron. Soc. 2012;425(3):1967-1979.
http://dx.doi.org/10.1111/j.1365-2966.2012.21518.x