RR Lyrae stars as tracers of halo substructures

Sonia Duffau; A. Katherina Vivas; Camila Navarrete; Julio Carballo-Bello; Gergel Hajdu; Márcio Catelan

doi:10.1051/epjconf/201715202013

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Proceedings

Open Access

EPJ Web of Conferences 152, 02013 (2017)
https://doi.org/10.1051/epjconf/201715202013

RR Lyrae stars as tracers of halo substructures

Sonia Duffau¹^,2^*, A. Katherina Vivas³, Camila Navarrete²^,1, Julio Carballo-Bello²^,1, Gergel Hajdu²^,1 and Márcio Catelan²^,1

¹ Millennium Institute of Astrophysics, Santiago, Chile
² Pontificia Universidad Católica de Chile, Instituto de Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
³ Cerro Tololo Interamerican Observatory, Casilla 603, La Serena, Chile

^* sduffau@astro.puc.cl

Published online: 8 September 2017

Abstract

Three RR Lyrae overdensity candidates in the southern sky have been studied using low resolution spectra obtained with the Goodman spectrograph at SOAR. We search for unidentified velocity peaks indicative of the possible presence of streams within the overdensities. Our results suggest that all three overdensities present an excess of radial velocity signal at high mean radial velocities which cannot be explained as a contribution from any known Galactic component.

© The Authors, published by EDP Sciences, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.