Sub-structures in the inner halo of the Milky Way
1 Centro de Investigaciones de Astronomía (CIDA), Mérida, Venezuela
2 Astronomy Department, Yale University, New Haven, CT, USA
3 Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Germany
4 Osservatorio Astronomico di Padova INAF, Italy
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We present a spectroscopic study of a sample of 238 RR Lyrae stars, from the QUEST survey, located in the Galactic halo at distances between 4 and 20 kpc from the Sun. Combining their spatial position and kinematics we were able to identify sub-structures in this part of the halo. Some of those sub-structures may be associated with known halo features like the Virgo Overdensity, the Hercules-Aquila Cloud, and the Anticenter Stream.
© Owned by the authors, published by EDP Sciences, 2012