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The Milky Way's halo in 6D: Gaia's Radial Velocity Spectrometer performance

Published online by Cambridge University Press:  09 May 2016

George Seabroke ,
Mark Cropper ,
David Katz ,
Paola Sartoretti ,
Pasquale Panuzzo ,
Olivier Marchal ,
Alain Gueguen ,
Kevin Benson ,
Chris Dolding  and
Howard Huckle
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George Seabroke
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
Mark Cropper
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
David Katz
Affiliation:
Observatoire Paris-Site de Meudon, GEPI, Paris, France
Paola Sartoretti
Affiliation:
Observatoire Paris-Site de Meudon, GEPI, Paris, France
Pasquale Panuzzo
Affiliation:
Observatoire Paris-Site de Meudon, GEPI, Paris, France
Olivier Marchal
Affiliation:
Observatoire Paris-Site de Meudon, GEPI, Paris, France
Alain Gueguen
Affiliation:
Observatoire Paris-Site de Meudon, GEPI, Paris, France
Kevin Benson
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
Chris Dolding
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
Howard Huckle
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
Mike Smith
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
Steve Baker
Affiliation:
Mullard Space Science Laboratory, University College London, Dorking, Surrey, UK
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Abstract

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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).

Keywords

techniques: radial velocitiessurveysstars: kinematicsGalaxy: halo
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 346 - 347
Copyright
Copyright © International Astronomical Union 2016 

References

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Robin, A. C., Luri, X., Reylé, C., et al. 2012, A&A, 543, A100Google Scholar