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29 March 2024
 
  » arxiv » astro-ph/0504058

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Kinematics of the Galactic Halo from Horizontal Branch stars in the Hamburg/ESO Survey
Christopher Thom ; Chris Flynn ; Michael S. Bessell ; Jyrki Hanninen ; Timothy C. Beers ; Norbert Christlieb ; Dionne James ; Johan Holmberg ; Brad K. Gibson ;
Date 4 Apr 2005
Journal Mon.Not.Roy.Astron.Soc. 360 (2005) 354-359
Subject astro-ph
AbstractLarge samples of Field Horizontal Branch (FHB) stars make excellent tracers of the Galactic halo; by studying their kinematics, one can infer important physical properties of our Galaxy. Here we present the results of a medium-resolution spectroscopic survey of 530 FHB stars selected from the Hamburg/ESO survey. The stars have a mean distance of ~7 kpc and thus probe the inner parts of the Milky Way halo. We measure radial velocities from the spectra in order to test the model of Sommer-Larsen et al., who suggested that the velocity ellipsoid of the halo changes from radially-dominated orbits to tangentially-dominated orbits as one proceeds from the inner to the outer halo. We find that the present data are unable to discriminate between this model and a more simple isothermal ellipsoid; we suggest that additional observations towards the Galactic centre might help to differentiate them.
Source arXiv, astro-ph/0504058
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