BEFORE THE BAR: KINEMATIC DETECTION OF A SPHEROIDAL METAL-POOR BULGE COMPONENT

Andrea Kunder; R. M. Rich; A. Koch; J. Storm; D. M. Nataf; R. De Propris; A. R. Walker; G. Bono; C. I. Johnson; Juntai Shen; Z. -Y. Li

doi:10.3847/2041-8205/821/2/L25

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BEFORE THE BAR: KINEMATIC DETECTION OF A SPHEROIDAL METAL-POOR BULGE COMPONENT

Journal article

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BEFORE THE BAR: KINEMATIC DETECTION OF A SPHEROIDAL METAL-POOR BULGE COMPONENT

Andrea Kunder, R. M. Rich, A. Koch, J. Storm, D. M. Nataf, R. De Propris, A. R. Walker, G. Bono, C. I. Johnson, Juntai Shen, …

Astrophysical journal. Letters, Vol.821(2), pp.L25-L25

04/20/2016

DOI: 10.3847/2041-8205/821/2/L25

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Abstract

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.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: BEFORE THE BAR: KINEMATIC DETECTION OF A SPHEROIDAL METAL-POOR BULGE COMPONENT
Creators: Andrea Kunder - Leibniz Institute for Astrophysics Potsdam
R. M. Rich - University of California, Los Angeles
A. Koch - Lancaster University
J. Storm - Leibniz Institute for Astrophysics Potsdam
D. M. Nataf - Australian National University
R. De Propris - Turku Centre for Computer Science
A. R. Walker - Cerro Tololo Inter-American Observatory
G. Bono - University of Rome Tor Vergata
C. I. Johnson - Center for Astrophysics Harvard & Smithsonian
Juntai Shen - Shanghai Astronomical Observatory
Z. -Y. Li - Shanghai Astronomical Observatory
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.821(2), pp.L25-L25
DOI: 10.3847/2041-8205/821/2/L25
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: Iop Publishing Ltd
Number of pages: 6
Grant note: Newton Fund; UK Research & Innovation (UKRI) Sonderforschungsbereich SFB 881 / German Research Foundation (DFG) Newton Advanced Fellowship - Royal Society; Royal Society 11333003; 11322326 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC) NSF PHY11-25915; AST-1413755 / National Science Foundation; National Science Foundation (NSF) XDB09000000 / Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences Clay Fellowship 2014CB845700 / 973 Program of China; National Basic Research Program of China
Language: English
Date published: 04/20/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984701726402771

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