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We present the results of combined deep Keck/NIRC2, HST/WFC3 near-infraredand Herschel far infrared observations of an extremely star forming dustylensed galaxy identified from the Herschel Astrophysical Terahertz Large AreaSurvey (H-ATLAS J133542.9+300401). The galaxy is gravitationally lensed by amassive WISE identified galaxy cluster at $z\sim1$. The lensed galaxy isspectroscopically confirmed at $z=2.685$ from detection of $\rm {CO (1\rightarrow 0)}$ by GBT and from detection of $\rm {CO (3 \rightarrow 2)}$obtained with CARMA. We use the combined spectroscopic and imaging observationsto construct a detailed lens model of the background dusty star-forming galaxy(DSFG) which allows us to study the source plane properties of the target. Thebest-fit lens model provide magnification of $\mu_{\rm star}=2.10\pm0.11$ and$\mu_{\rm dust}=2.02\pm0.06$ for the stellar and dust components respectively.Multi-band data yields a magnification corrected star formation rate of$1900(\pm200)\,M_{\odot}{\rm yr^{-1}}$ and stellar mass of$6.8_{-2.7}^{+0.9}\times10^{11}\,M_{\odot}$ consistent with a main sequence ofstar formation at $z\sim2.6$. The CO observations yield a molecular gas mass of$8.3(\pm1.0)\times10^{10}\,M_{\odot}$, similar to the most massive star-forminggalaxies, which together with the high star-formation efficiency areresponsible for the intense observed star formation rates. The lensed DSFG hasa very short gas depletion time scale of $\sim40$ Myr. The high stellar massand small gas fractions observed indicate that the lensed DSFG likely hasalready formed most of its stellar mass and could be a progenitor of the mostmassive elliptical galaxies found in the local Universe.

Herschel and Hubble study of a lensed massive dusty starbursting galaxy at $z\sim3$