银河系的6D光晕：盖亚的径向速度光谱仪性能
The Milky Way's halo in 6D: Gaia's Radial Velocity Spectrometer performance
摘要：
盖亚的径向速度谱仪（RVS）自初始调试以来已在常规阶段运行了一年多。RVS继续工作良好，但高于预期水平的杂散光降低了极限幅度。在V = 16.5 mag时，G2 V星的任务结束径向速度（RV）性能要求为15 km/s。相反，在15 < V < 16 mag时达到15 km/s的精度，与预测损失1.4 mag的模拟一致。模拟还表明，更改盖亚的机载软件可以恢复约0.14 mag的损失。因此，盖亚的机载软件在2015年4月进行了升级。介绍了这一新的调试期的状况，以及RVS光谱地面处理的最新科学性能。我们说明的影响RVS限制幅度盖亚的银河系的晕在6D使用盖亚宇宙模型快照（GUMS）。
英文摘要：
Gaia's Radial Velocity Spectrometer (RVS) has been operating in routine phase for over one year since initial commissioning. RVS continues to work well but the higher than expected levels of straylight reduce the limiting magnitude. The end-of-mission radial-velocity (RV) performance requirement for G2V stars was 15 km/s at V = 16.5 mag. Instead, 15 km/s precision is achieved at 15 < V < 16 mag, consistent with simulations that predict a loss of 1.4 mag. Simulations also suggest that changes to Gaia's onboard software could recover ~0.14 mag of this loss. Consequently Gaia's onboard software was upgraded in April 2015. The status of this new commissioning period is presented, as well as the latest scientific performance of the on-ground processing of RVS spectra. We illustrate the implications of the RVS limiting magnitude on Gaia's view of the Milky Way's halo in 6D using the Gaia Universe Model Snapshot (GUMS).
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