VizieR Online Data Catalog: Fastest stars in the Galaxy with Gaia DR2 (Marchetti+, 2019)

We derived distance and total velocities for all the 7183262 stars with a full phase space measurement in the Gaia DR2 catalogue (Gaia Collaboration 2018A&A...616A...1G, Cat. I/345) in order to find unbound objects and velocity outliers. We defined our sample of high-velocity stars as those stars with an estimated probability of being unbound from the Milky Way P_ub>50 per cent, resulting in a total of 125 stars with reliable astrometric parameters and radial velocities. We traced back the high-velocity stars in the Galactic potential to derive orbital parameters.

Out of these 125 stars, we found 20 stars with predicted probabilities P_ub>80 per cent. The observed and derived kinematic properties of these stars are summarized in Table 2, the other 105 stars are presented in Table C1. In Table D1, we report the updated values of the distance, total velocity, and P_ub for the 20 stars included in Table 2, after including the -0.029mas global parallax zero-point mentioned in Lindegren et al. (2018A&A...616A...2L, Cat. I/345). Finally, in Table E1 we present artificially inflated parallax uncertainties to keep into account systematic errors and the updated parameters.

(4 data files).