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

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


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...[Show more]

CollectionsANU Research Publications
Date published: 2016
Type: Journal article
Source: The Astrophysical Journal
DOI: 10.3847/2041-8205/821/2/L25


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