Query : 2022A&A...659A..95T

2022A&A...659A..95T - Astronomy and Astrophysics, volume 659A, 95-95 (2022/3-1)

Survey of Surveys. I. The largest compilation of radial velocities for the Galaxy.


Abstract (from CDS):

Context. In the present-day panorama of large spectroscopic surveys, the amount, diversity, and complexity of the available data continuously increase. The overarching goal of studying the formation and evolution of our Galaxy is hampered by the heterogeneity of instruments, selection functions, analysis methods, and measured quantities. Aims. We present a comprehensive catalogue, the Survey of Surveys (SoS), built by homogeneously merging the radial velocity (RV) determinations of the largest ground-based spectroscopic surveys to date, such as APOGEE, GALAH, Gaia-ESO, RAVE, and LAMOST, using Gaia as a reference. This pilot study serves to prove the concept and to test the methodology that we plan to apply in the future to the stellar parameters and abundance ratios as well. Methods. We have devised a multi-staged procedure that includes: (i) the cross match between Gaia and the spectroscopic surveys using the official Gaia cross-match algorithm, (ii) the normalisation of uncertainties using repeated measurements or the three-cornered hat method, (iii) the cross calibration of the RVs as a function of the main parameters on which depend (magnitude, effective temperature, surface gravity, metallicity, and signal-to-noise ratio) to remove trends and zero point offsets, and (iv) the comparison with external high-resolution samples, such as the Gaia RV standards and the Geneva-Copenhagen survey, to validate the homogenisation procedure and to calibrate the RV zero-point of the SoS catalogue. Results. We provide the largest homogenised RV catalogue to date, containing almost 11 million stars, of which about half come exclusively from Gaia and half in combination with the ground-based surveys. We estimate the accuracy of the RV zero-point to be about 0.16-0.31 km s–1 and the RV precision to be in the range 0.05-1.50 km s–1 depending on the type of star and on its survey provenance. We validate the SoS RVs with open clusters from a high resolution homogeneous samples and provide the systemic velocity of 55 individual open clusters. Additionally, we provide median RVs for 532 clusters recently discovered by Gaia data. Conclusions. The SoS is publicly available and ready to be applied to various research projects, such as the study of star clusters, Galactic archaeology, stellar streams, or the characterisation of planet-hosting stars, to name a few. We also plan to include survey updates and more data sources in future versions of the SoS.

Abstract Copyright: © ESO 2022

Journal keyword(s): catalogs - methods: statistical - stars: fundamental parameters - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/659/A95): sos.dat apogee.dat galah.dat ges.dat rave.dat lamost.dat clusters.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6838 1
2 NAME Gal Anticenter reg 05 46 +28.9           ~ 878 0
3 NGC 2506 OpC 08 00 02.4 -10 46 23   8.28 7.6     ~ 268 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13915 0
5 NGC 6475 OpC 17 53 47.3 -34 50 28           ~ 377 0

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