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We report spectroscopic confirmation and high-resolution infrared imaging ofa z=2.79 triply-imaged galaxy behind the Bullet Cluster. This source, aSpitzer-selected luminous infrared galaxy (LIRG), is confirmed via polycyclicaromatic hydrocarbon (PAH) features using the Spitzer Infrared Spectrograph(IRS) and resolved with HST WFC3 imaging. In this galaxy, which with a stellarmass of M*=4e9 Msun is one of the two least massive ones studied with IRS atz>2, we also detect H_2 S(4) and H_2 S(5) pure rotational lines (at 3.1 sigmaand 2.1 sigma) - the first detection of these molecular hydrogen lines in ahigh-redshift galaxy. From the molecular hydrogen lines we infer an excitationtemperature T=377+68-84 K. The detection of these lines indicates that the warmmolecular gas mass is 6(+36-4)% of the stellar mass and implies the likelyexistence of a substantial reservoir of cold molecular gas in the galaxy.Future spectral observations at longer wavelengths with facilities like theHerschel Space Observatory, the Large Millimeter Telescope, and the AtacamaPathfinder EXperiment (APEX) thus hold the promise of precisely determining thetotal molecular gas mass. Given the redshift, and using refined astrometricpositions from the high resolution imaging, we also update the magnificationestimate and derived fundamental physical properties of this system. Thepreviously published values for total infrared luminosity, star formation rate,and dust temperature are confirmed modulo the revised magnification; however wefind that PAH emission is roughly a factor of five stronger than would bepredicted by the relations between the total infrared and PAH luminosityreported for SMGs and starbursts in Pope et al. (2008).

Spectroscopic Confirmation of a z=2.79 Multiply Imaged Luminous Infrared Galaxy Behind the Bullet Cluster