Seabroke, G;
Cropper, M;
Katz, D;
Sartoretti, P;
Panuzzo, P;
Marchal, O;
Gueguen, A;
... Baker, S; + view all
(2015)
The Milky Way's halo in 6D: Gaia's Radial Velocity Spectrometer performance.
Proceedings of the International Astronomical Union
, 11
(S317)
pp. 346-347.
10.1017/S1743921315006961.
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Abstract
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−1 at V = 16.5 mag. Instead, 15 km s−1 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).
| Type: | Article |
|---|---|
| Title: | The Milky Way's halo in 6D: Gaia's Radial Velocity Spectrometer performance |
| Location: | Honolulu, HI |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1017/S1743921315006961 |
| Publisher version: | https://doi.org/10.1017/S1743921315006961 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, techniques: radial velocities, surveys, stars: kinematics, Galaxy: halo |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1517127 |
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