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| DOI | 10.3847/2041-8205/821/2/L25 | ||||
| Año | 2016 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We present 947 radial velocities of RR Lyrae variable stars in four fields located toward the Galactic bulge, observed within the data from the ongoing Bulge RR Lyrae Radial Velocity Assay (BRAVA-RR). We show that these RR Lyrae stars (RRLs) exhibit hot kinematics and null or negligible rotation and are therefore members of a separate population from the bar/pseudobulge that currently dominates the mass and luminosity of the inner Galaxy. Our RRLs predate these structures. and have metallicities, kinematics, and spatial distribution that are consistent with a "classical" bulge, although we cannot yet completely rule out the possibility that they are the metal-poor tail of a more metal-rich ([Fe/H] similar to -1 dex) halo-bulge population. The complete catalog of radial velocities for the BRAVA-RR stars is also published electronically.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Kunder, Andrea | Mujer |
Leibniz Inst Astrophys Potsdam AIP - Alemania
Leibniz Institute for Astrophysics Potsdam - Alemania |
| 2 | Rich, R. Michael | Hombre |
UNIV CALIF LOS ANGELES - Estados Unidos
University of California, Los Angeles - Estados Unidos |
| 3 | Koch, A. | Hombre |
Univ Lancaster - Reino Unido
Lancaster University - Reino Unido Department of Physics, Lancaster University - Reino Unido |
| 4 | Storm, Jesper | Hombre |
Leibniz Inst Astrophys Potsdam AIP - Alemania
Leibniz Institute for Astrophysics Potsdam - Alemania |
| 5 | Nataf, David M. | Hombre |
Australian Natl Univ - Australia
Australian National University - Australia The Australian National University - Australia |
| 6 | DE PROPRIS, ROBERTO ANGEL | Hombre |
Univ Turku - Finlandia
Turun yliopisto - Finlandia |
| 7 | WALKER, ALISTAIR | Hombre |
Observatorio Interamericano del Cerro Tololo - Chile
Cerro Tololo Inter American Observatory - Chile |
| 8 | Bono, G. | Hombre |
Univ Roma Tor Vergata - Italia
Rome Astron Observ - Italia Università degli Studi di Roma Tor Vergata - Italia Osservatorio Astronomico di Roma - Italia Università degli Studi di Roma "Tor Vergata" - Italia |
| 9 | Johnson, Christian I. | Hombre |
Harvard Smithsonian Ctr Astrophys - Estados Unidos
Harvard-Smithsonian Center for Astrophysics - Estados Unidos |
| 10 | Shen, Juntai | - |
CASSACA - China
Shanghai Astronomical Observatory Chinese Academy of Sciences - China |
| 11 | Li, Zhi-Yun | - |
CASSACA - China
Shanghai Astronomical Observatory Chinese Academy of Sciences - China |
| Fuente |
|---|
| National Natural Science Foundation of China |
| National Science Foundation |
| German Research Foundation (DFG) |
| Newton Fund |
| Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences |
| 973 Program of China |
| Newton Advanced Fellowship - Royal Society |
| Clay Fellowship |
| Directorate for Mathematical and Physical Sciences |
| Agradecimiento |
|---|
| We thank the Australian Astronomical Observatory, which have made these observations possible. This research was supported in part by the National Science Foundation under grant No. NSF PHY11-25915. This work was supported by Sonderforschungsbereich SFB 881 "The Milky Way System" (subprojects A4, A5, A8) of the German Research Foundation (DFG). R.M.R. acknowledges support from grant AST-1413755 from the National Science Foundation. C.I.J. gratefully acknowledges support from the Clay Fellowship, administered by the Smithsonian Astrophysical Observatory. The research presented here is partially supported by the 973 Program of China under grant No. 2014CB845700, by the National Natural Science Foundation of China under grant Nos. 11333003 and 11322326, and by the Strategic Priority Research Program "The Emergence of Cosmological Structures" (No. XDB09000000) of the Chinese Academy of Sciences. J.S. acknowledges support from a Newton Advanced Fellowship awarded by the Royal Society and the Newton Fund. This work made use of the facilities of the Center for High Performance Computing at Shanghai Astronomical Observatory. |