Line-intensity mapping (LIM) is an emerging observational technique to study the large-scale structure of the universe. LIM measurements are sensitive to the aggregate line emission from the entire galaxy population, therefore placing important integral constraints on galaxy evolution in a cosmological context. In the first part of this talk, I will provide a status update of the Tomographic Ionized-carbon Mapping Experiment (TIME), a forthcoming instrument designed to measure the star formation rate during cosmic reionization by observing the redshifted 158-micron [CII] line in tomography. Over the same spectral coverage, it can simultaneously study the abundance of molecular gas during the era of peak star formation by observing the rotational CO lines. I will discuss the constraining power TIME will offer on various physical quantities, such as the escape fraction of ionizing photons and the evolution of cosmic molecular gas density. In the second part, I will present a simple, analytic framework to self-consistently model multiple emission lines in the context of using multi-line intensity mapping to dissect the multi-phase ISM of galaxies.
Speaker: Guochao Sun, Caltech
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