QSAGE is a Hubble Space Telescope spectroscopic survey tracing the connection between galaxies and their surrounding CGM/IGM at z ~ 1.5. HST/WFC3 G141 grism observations have been performed in fields around 12 bright quasars which have existing high-resolution HST/STIS or HST/COS spectra. The quasar spectra probe gas in absorption along the line-of-sight at z < 1.5, while the grism observations blindly select galaxies (primarily via Hα) at similar redshifts to the absorbing systems. The QSAGE survey therefore provides a unique statistical sample of star-forming galaxies and their surrounding gas at z > 1.

An example of one of the 12 QSAGE fields (taken from Bielby et al. 2019)

I performed the WFC3/G141 data reduction for the QSAGE survey using Grizli. More details can be found in the survey definition paper.