New release of radial velocities from the Gaia-ESO Survey

A new catalogue of radial velocities from the Gaia-ESO Survey has been released by the European Southern Observatory. 
Gaia-ESO is a public spectroscopic survey carried out with the fiber-fed optical spectrograph FLAMES at the VLT, that observed more than 100,000 Galactic stars during 340 nights over almost 10 years. Observed stars belong to all the components of the Milky Way field and to a very large sample of star clusters. These observations are allowing a large community of astronomers to better understand the formation and evolution of our Galaxy, the physics behind the stellar evolution and the mechanisms driving the formation and dispersion of star clusters. This data release represents a new important milestone in this project, since radial velocities of the full sample of observed stars will now be available to the whole astronomical community.


Radial velocities distributions of the two young clusters Gamma Velorum and NGC2547, which show the presence of multiple subgroups discovered by Jeffries et al. (2014) and Sacco et al. (2015) with the Gaia-ESO data. 

Researchers from nine INAF institutes (Arcetri, Bologna, Capodimonte, Catania, Padova, Palermo, Roma, Torino and Trieste) are involved in this project. The Arcetri Observatory is leading the INAF contribution, since Sofia Randich is Co-PI of the project together with Gerry Gilmore (IoA, Cambridge); Germano Sacco is a member of the project office and coordinated the data reduction and the determination of the radial velocities in collaboration with researchers in Cambridge; Elena Franciosini, Laura Magrini and Elena Pancino held leading positions into the consortium; Lorenzo Morbidelli, Marco Padovani, Nicoletta Sanna and Mathieu Van der Swaelmen have contributed to the analysis of the data and to the scientific exploitation of the parameters derived from the spectra in collaboration with other colleagues.

Artist's impression of the Gaia-ESO Survey

The Gaia-ESO Survey combines spectroscopic observations from the ground (VLT) with astrometric observations from space (Gaia, 2013-2018).