The BUFFALO HST Survey
2020
The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + 101 parallel Cycle
25 Hubble Space Telescope (HST) Treasury program taking data from 2018 to 2020. BUFFALO will expand
existing coverage of the Hubble Frontier Fields (HFF) in Wide Field Camera 3/IR F105W, F125W, and F160W
and Advanced Camera for Surveys/WFC F606W and F814W around each of the six HFF clusters and flanking
fields. This additional area has not been observed by HST but is already covered by deep multiwavelength data
sets, including Spitzer and Chandra. As with the original HFF program, BUFFALO is designed to take advantage
of gravitational lensing from massive clusters to simultaneously find high-redshift galaxies that would otherwise lie
below HST detection limits and model foreground clusters to study the properties of dark matter and galaxy
assembly. The expanded area will provide the first opportunity to study both cosmic variance at high redshift and
galaxy assembly in the outskirts of the large HFF clusters. Five additional orbits are reserved for transient followup. BUFFALO data including mosaics, value-added catalogs, and cluster mass distribution models will be released
via MAST on a regular basis as the observations and analysis are completed for the six individual clusters.
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