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Understanding the formation and evolution of galaxies over cosmic time is oneof the foremost goals of astrophysics and cosmology today. The cosmic starformation rate has undergone a dramatic evolution over the course of the last14 billion years, and dust obscured star forming galaxies (DSFGs) are a crucialcomponent of this evolution. A variety of important, bright, and unextincteddiagnostic lines are present in the far-infrared (FIR) which can providecrucial insight into the physical conditions of galaxy evolution, including theinstantaneous star formation rate, the effect of AGN feedback on starformation, the mass function of the stars, metallicities, and the spectrum oftheir ionizing radiation. FIR spectroscopy is technically difficult butscientifically crucial. Stratospheric balloons offer a platform which canoutperform current instrument sensitivities and are the only way to providelarge-area, wide bandwidth spatial/spectral mapping at FIR wavelengths. NASArecently selected TIM, the Terahertz Intensity Mapper, with the goal ofdemonstrating the key technical milestones necessary for FIR spectroscopy. TheTIM instrument consists of an integral-field spectrometer from 240-420 micronswith 3600 kinetic-inductance detectors (KIDs) coupled to a 2-meterlow-emissivity carbon fiber telescope. In this paper, we will summarize plansfor the TIM experiment's development, test and deployment for a planned flightfrom Antarctica.

The Terahertz Intensity Mapper (TIM): a Next-Generation Experiment for Galaxy Evolution Studies