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Based on high-resolution spectra obtained with PHOENIX at Gemini-South,CRIRES at VLT-UT1, and ESPaDOnS at CFHT, we present new measurements of theradial and projected rotational velocities of 219 low-mass stars. The targetlikely membership was initially established using the Bayesian analysis toolrecently presented in \citet{2013malo}, taking into account only the position,proper motion and photometry of the stars to assess their membershipprobability. In the present study, we include radial velocity as an additionalinput to our analysis, and in doing so we confirm the high membershipprobability for 130 candidates: 27 in $\beta$ Pictoris, 22 inTucana-Horologium, 25 in Columba, 7 in Carina, 18 in Argus and 18 in AB Doradusand 13 with an ambiguous membership. Our analysis also confirms the membershipof 57 stars proposed in the literature. A subsample of 16 candidates wasobserved at three or more epochs, allowing us to discover 6 new spectroscopicbinaries. The fraction of binaries in our sample is 25%, consistent with valuesin the literature. Twenty percent of the stars in our sample show projectedrotational velocities (\vsini) higher than 30 \kms\ and therefore areconsidered as fast rotators. A parallax and other youth indicators are stillneeded to fully confirm the 130 highly probable candidates identified here asnew {\it bona fide} members. Finally, based on the X-ray emission of {\it bonafide} and highly probable group members, we show that for low-mass stars in the12-120 Myr age range, the X-ray luminosity is an excellent indicator of youthand better than the more traditionally used R$_{\rm X}$ parameter, the ratio ofX-ray to bolometric luminosity.

BANYAN. III. Radial velocity, Rotation and X-ray emission of low-mass star candidates in nearby young kinematic groups