FRESCO Halpha emitter catalogue

With the advent of JWST, this line has recently become observable at z>3 for the first time. We present a catalog of 1050 H{alpha} emitters at 3.7<z<6.7 in the GOODS fields obtained from a blind search in JWST NIRCam/grism data.

We made use of the FRESCO survey's 124 arcmin^2^ of observations in GOODS-North and GOODS-South with the F444W filter, probing H{alpha} at 4.9<z<6.7, and the CONGRESS survey's 62 arcmin^2^ of observations in GOODS-North with F356W, probing H{alpha} at 3.8<z<5.1. We found an overdensity with 98 sources at z~4.4 in GOODS-N, and confirmed previously reported overdensities at z~5.2 in GOODS-N and at z~5.4 and z~5.9 in GOODS-S. We computed the observed H{alpha} luminosity functions (LFs) in three bins centered at z~4.45, 5.30, and 6.15, which are the first such measurements at z>3 obtained based purely on spectroscopic data, robustly tracing galaxy star formation rates (SFRs) beyond the peak of the cosmic star formation history.