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
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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
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Before the bar
T2 - kinematic detection of a spheroidal metal-poor bulge component
AU - Kunder, Andrea
AU - Rich, R. M.
AU - Koch, A.
AU - Storm, Jesper
AU - Nataf, D. M.
AU - Propris, R. De
AU - Walker, Alistair
AU - Bono, G.
AU - Johnson, Christian I.
AU - Shen, Juntai
AU - Li, Z.-y.
N1 - 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
PY - 2016/4/18
Y1 - 2016/4/18
N2 - 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.
AB - 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.
KW - Galaxy: bulge
KW - Galaxy: evolution
KW - Galaxy: formation
KW - Galaxy: halo
KW - Galaxy: kinematics and dynamics
KW - Galaxy: structure
U2 - 10.3847/2041-8205/821/2/L25
DO - 10.3847/2041-8205/821/2/L25
M3 - Journal article
VL - 821
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L25
ER -