The vertical velocity dispersion profile of the Galactic thick disk

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dc.creatorBidin, C. Moni
dc.creatorGirard, T. M.
dc.creatorCarraro, G.
dc.creatorMendez, R. A.
dc.creatorvan Altena, W. F.
dc.creatorKorchagin, V. I.
dc.creatorCasetti-Dinescu, D. I.
dc.date2007-12-20
dc.date.accessioned2026-07-07T08:50:40Z
dc.date.available2026-07-07T08:50:40Z
dc.descriptionWe present the results of radial velocity measurements of 770 thick disk red giants toward the South Galactic Pole, vertically distributed from 0.5 kpc to 5 kpc with respect to the Galactic plane. We find a small gradient in the vertical velocity dispersion (sigma_W) of 3.8+/-0.8 km/s kpc. Even more noteworthy, our values of $σ_W$ are small compared to literature values: in the middle of the vertical height range we find sigma_W(z=2kpc)=30 km/s. We found no possible explanation for this small value of sigma_W in terms of sample contamination by thin disk stars, nor by wrong assumptions regarding the metallicity distribution and the derived distances.
dc.description2 pages, 1 figure, proceeding of the XII IAU Latin American Regional Meeting
dc.identifierhttps://arxiv.org/abs/0712.3528
dc.identifierhttp://arxiv.org/abs/0712.3528
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144679
dc.subjectAstrophysics
dc.titleThe vertical velocity dispersion profile of the Galactic thick disk
dc.typetext

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