Princeton University/Institute for Advanced Study Early Universe/Cosmology Lunch Discussion

The Large Synoptic Survey Telescope (LSST) is projected to observe approximately 25 billion galaxies, which will be incredibly useful for measurements of galaxy clustering and large scale structure in the Universe. One of the primary limiting factors in a galaxy clustering analysis, however, is the determination of photometric redshifts for a large sample of these galaxies. While the longstanding expectation is that red sequence galaxies with a strong Balmer/4000 Angstrom break have the spectral shape that provides the most precise redshift fits, we consider the alternative of galaxies that exhibit extreme emission lines (EELs). We find that EELs are numerous enough to beat the shot noise and are therefore a promising sample for LSS measurements.