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We present the first results of our spectroscopic follow-up of 6.5 < z < 10candidate galaxies behind clusters of galaxies. We report the spectroscopicconfirmation of an intrinsically faint Lyman break galaxy (LBG) identified as az 850LP-band dropout behind the Bullet Cluster. We detect an emission line at{\lambda} = 9412 {\AA} at >5{\sigma} significance using a 16 hr long exposurewith FORS2 VLT. Based on the absence of flux in bluer broadband filters, theblue color of the source, and the absence of additional lines, we identify theline as Ly{\alpha} at z = 6.740 \pm 0.003. The integrated line flux is f = (0.7\pm 0.1 \pm 0.3) \times 10^{-17} erg^{-1} s^{-1} cm^{-2} (the uncertainties aredue to random and flux calibration errors, respectively) making it the faintestLy{\alpha} flux detected at these redshifts. Given the magnification of {\mu} =3.0 \pm 0.2 the intrinsic (corrected for lensing) flux is f^int = (0.23 \pm0.03 \pm 0.10 \pm 0.02) \times 10^{-17} erg^{-1} s^{-1} cm^{-2} (additionaluncertainty due to magnification), which is ~2-3 times fainter than other suchmeasurements in z ~ 7 galaxies. The intrinsic H 160W-band magnitude of theobject is m^int(H_160W)=27.57 \pm 0.17, corresponding to 0.5 L* for LBGs atthese redshifts. The galaxy is one of the two sub-L* LBG galaxiesspectroscopically confirmed at these high redshifts (the other is also a lensedz = 7.045 galaxy), making it a valuable probe for the neutral hydrogen fractionin the early universe.

Spectroscopic Confirmation of a z=6.740 Galaxy behind the Bullet Cluster