Line-Intensity Mapping: Why and How?

Line-intensity mapping is an emerging technique to produce unprecedented three dimensional maps of large scale structure across cosmic time. Line-intensity mapping surveys measure spatial fluctuations in the collective emission from many individually unresolved galaxies and/or diffuse gas in convenient spectral lines. A number of ongoing and upcoming projects are employing this technique towards diverse and exciting scientific goals, including studies of galaxy evolution, cosmic reionization, and fundamental cosmology. I will overview the compelling science case for line-intensity mapping, focusing on how future 21 cm observations of the Epoch of Reionization may be fruitfully combined with surveys in other emission lines. I will discuss some lines of interest, including the [CII] 158 micron line from ionized carbon and the [OIII] 88 micron line from doubly ionized oxygen, and analysis methods to help extract science from upcoming measurements. Ultimately, these efforts may play a crucial role in understanding the nature of cosmic reionization and the ionizing sources that drive it.

Followed by wine and cheese in Pupin 1402.

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