BzK selected starburst galaxies at z=2 in GOODS-S: masses, star- formation rates and stellar populations

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We have calibrated a new photometric technique based on B-, z- and K- colorbands to efficiently select z~2 galaxies regardless of their dust reddening content. A large sample of spectroscopically confirmed z~2 massive galaxies is being built in GOODS South using the VLT. These galaxies are consistent with having high masses and SFRs, and would rarely be included in conventional samples of UV selected dropout galaxies because they are intrinsically too red. Here we propose deep GNIRS spectroscopy observations of the redshifted optical emission lines for a representative sample of 10 massive star-forming galaxies at 1.4< z< 2.5. We will (1) estimate their velocity dispersion, dynamical masses, and M/L ratios; (2) determine reddening and SFRs; (3) constrain metallicity; (4) search for obscured AGN; and (5) look for signatures of ongoing merger events. These measurements will significantly improve our knowledge of massive z~2 galaxies, will help constrain galaxy formation models and increase the overall scientific return of the GOODS legacy program.

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