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dc.contributor.authorCubarsí Morera, Rafael
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Matemàtica Aplicada IV
dc.date.accessioned2010-03-18T12:49:37Z
dc.date.available2010-03-18T12:49:37Z
dc.date.issued2009-12
dc.identifier.urihttp://hdl.handle.net/2117/6700
dc.description.abstractAmong metallicity, colour, and other star properties, the eccentricity of the star’s orbit behaves as a very good sampling parameter to find a more detailed structure for the disc velocity distribution, allowing distinctions between different eccentricity layers. For subsam- ples with eccentricities e < 0.15, star velocities are approximately symmetrically distributed around the LSR in the radial direction, with a dearth of stars at the LSR. For e = 0.15, the core distribution of the thin disc is supported by two major stellar groups with opposite radial velocities. Several simulations confirm that such a double-peaked distribution comes from the lognormal distribution of the velocity amplitudes. For maximum eccentricity 0.3 and maximum distance to the Galactic plane 0.5 kpc a representative thin disc sample is obtained. An explanation of the apparent vertex deviation of the disc from the swinging of those major kinematic groups around the LSR is possible, which predicts a continuously changing orientation of the disc’s pseudo ellipsoid.
dc.format.extent13 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Estadística matemàtica::Mètodes estadístics
dc.subject.lcshAstronomy and astrophysics
dc.subject.lcshProbabilities ; Stochastic processes
dc.subject.lcshMathematical statistics
dc.titleSmall-scale structure of the disc velocity distribution. A maximum entropy statistical approach - Part II
dc.typeExternal research report
dc.subject.lemacAstronomia ; Astrofísica
dc.subject.lemacProbabilitats ; Processos estocàstics
dc.subject.lemacEstadística matemàtica
dc.contributor.groupUniversitat Politècnica de Catalunya. gAGE - Grup d'Astronomia i Geomàtica
dc.subject.ams85 ASTRONOMY AND ASTROPHYSICS
dc.subject.ams60 PROBABILITY THEORY AND STOCHASTIC PROCESSES
dc.subject.ams62 STATISTICS
dc.rights.accessOpen Access
drac.iddocument2193632
dc.description.versionPreprint


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