Radial velocities of 2768 fundamental mode RR Lyrae stars (RRLs) toward the Southern Galactic bulge are presented, spanning the southern bulge from -8 500 km/s and find that the majority of these high-velocity stars are halo interlopers; it is unclear if a sub-sample of these stars with similar space velocities have a common origin. Once the 25% of the sample represented by halo interlopers is cleaned, we can clearly discern two populations of bulge RRLs in the inner Galaxy. One population of RRLs is not as tightly bound to the Galaxy (but is still confined to the inner ~3.5 kpc), and is both spatially and kinematically consistent with the barred bulge. The second population is more centrally concentrated and does not trace the bar. One possible interpretation is that this population was born prior to bar formation, as its spatial location, kinematics and pulsation properties suggest, possibly from an accretion event at high redshift.

中文翻译：

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天琴座 RR 星的凸出径向速度测定 (BRAVA-RR) DR2：双峰凸出？

展示了 2768 颗基本模式天琴座 RR 星 (RRL) 的径向速度，它们从 -8 500 公里/秒跨越了南星系核，发现这些高速恒星中的大多数是光晕闯入者；目前尚不清楚这些具有相似空间速度的恒星的子样本是否具有共同的起源。一旦以光环闯入者为代表的 25% 的样本被清理干净，我们就可以清楚地辨别内部星系中的两个凸起 RRL 群体。一组 RRL 与银河系没有那么紧密的联系（但仍局限于内部~3.5 kpc），并且在空间和运动学上都与棒状凸起一致。第二个群体更集中，不追踪酒吧。一种可能的解释是，该种群在条形形成之前出生，因为它的空间位置，