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We present $Hubble\ Space\ Telescope$ ($HST$) imaging and grism spectroscopyof a strongly lensed LIRG at $z=0.816$, SGAS 143845.1$+$145407, and use themagnification boost of gravitational lensing to study the distribution of starformation throughout this galaxy. Based on the $HST$ imaging data, we create alens model for this system; we compute the mass distribution and magnificationmap of the $z=0.237$ foreground lens. We find that the magnification of thelensed galaxy ranges between $2$ and $10$, with a total magnification (measuredover all the images of the source) of $\mu=11.8^{+4.6}_{-2.4}$. We find thatthe total projected mass density within $\sim34$ kpc of the brightest clustergalaxy is $6.0^{+0.3}_{-0.7}\times10^{12}\,M_{\odot}$. Using the lens model wecreate a source reconstruction for SGAS 143845.1$+$145407, which paired with afaint detection of H$\alpha$ in the grism spectroscopy, allows us to finallycomment directly on the distribution of star formation in a $z\sim1$ LIRG. Wefind widespread star formation across this galaxy, in agreement with thecurrent understanding of these objects. However, we note a deficit of H$\alpha$emission in the nucleus of SGAS 143845.1$+$145407, likely due to dustextinction.

Lens Model and Source Reconstruction Reveal the Morphology and Star Formation Distribution in the Cool Spiral LIRG SGAS J143845.1$+$145407