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• 1603.06578v1

Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.3847/2041-8205/821/2/L25

Accepted author manuscript, 1.33 MB, PDF document

• 1603.06578.pd

Accepted author manuscript, 983 KB, PDF document

• apjl_821_2_L25

Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.3847/2041-8205/821/2/L25

Final published version, 781 KB, PDF document

Before the bar: kinematic detection of a spheroidal metal-poor bulge component

Research output: Contribution to journalJournal articlepeer-review

Published
• Andrea Kunder
• R. M. Rich
• A. Koch
• Jesper Storm
• D. M. Nataf
• R. De Propris
• Alistair Walker
• G. Bono
• Christian I. Johnson
• Juntai Shen
• Z.-y. Li
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Article number L25 18/04/2016 Astrophysical Journal Letters 2 821 6 Published English

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 ($[\mathrm{Fe}/{\rm{H}}]\sim -1$ dex) halo–bulge population. The complete catalog of radial velocities for the BRAVA-RR stars is also published electronically.

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.3847/2041-8205/821/2/L25