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We report first science results from our new spectrometer, the 2nd generationz(Redshift) and Early Universe Spectrometer (ZEUS-2), recently commissioned onthe Atacama Pathfinder Experiment telescope (APEX). ZEUS-2 is a submillimetergrating spectrometer optimized for detecting the faint and broad lines fromdistant galaxies that are redshifted into the telluric windows from 200 to 850microns. It utilizes a focal plane array of transition-edge sensed bolometers,the first use of these arrays for astrophysical spectroscopy. ZEUS-2 promisesto be an important tool for studying galaxies in the years to come due to itssynergy with ALMA and its capabilities in the short submillimeter windows thatare unique in the post Herschel era. Here we report on our first detection ofthe [CII] 158 $\mu m$ line with ZEUS-2. We detect the line at z ~ 1.8 fromH-ATLAS J091043.1-000322 with a line flux of $(6.44 \pm 0.42) \times 10^{-18} Wm^{-2}$. Combined with its far-infrared luminosity and a new Herschel-PACSdetection of the [OI] 63 $\mu m $ line we model the line emission as comingfrom a photo-dissociation region with far-ultraviolet radiation field, $G\approx 2 \times 10^{4} G_{0}$, gas density, $n \approx 1 \times 10^{3}cm^{-3}$ and size between ~ 0.4 and 1 kpc. Based on this model, we concludethat H-ATLAS J091043.1-000322 is a high redshift analogue of a localultra-luminous infrared galaxy, i.e. it is likely the site of a compactstarburst due to a major merger. Further identification of these mergingsystems is important for constraining galaxy formation and evolution models.

The 2nd Generation z(Redshift) and Early Universe Spectrometer Part I: First-light observation of a highly lensed local-ULIRG analog at high-z