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We use rest-frame UV spectroscopy to investigate the properties related tolarge-scale gas outflows, and to the dust extinction and star-formation ratesof a sample of z ~ 2 star-forming galaxies from the Galaxy Mass Assemblyultradeep Spectroscopic Survey (GMASS). Dust extinction is estimated from therest-frame UV continuum slope and used to obtain dust-corrected star-formationrates for the galaxies of the sample. For the entire sample, a mean value ofthe continuum slope <\beta> = -1.11 \pm 0.44 (r.m.s.) was derived, while theaverage SFR was found to be <SFR> = 52 \pm 48 M_sun/yr (r.m.s.). A positivecorrelation between SFR and stellar mass was observed, in agreement with otherworks, the logarithmic slope of the relation being 1.10 \pm 0.10.Low-ionization absorption lines, associated with the interstellar medium, werefound to be blueshifted, with respect to the rest frame of the system, whichindicates that there is outflowing gas with typical velocities of the order of~ 100 km/s. Finally, investigating correlations between galaxy UV spectralcharacteristics and galaxy general properties, we report a possible correlationbetween the equivalent width of the interstellar absorption lines and SFR,stellar mass, and colour excess similar to that seen to hold at differentredshifts.

GMASS ultradeep spectroscopy of galaxies at z ~ 2 - VII. Star formation, extinction, and gas outflows from UV spectra