Data from the JWST Extragalactic Medium-band Survey (JEMS)

The JWST Extragalactic Medium-band Survey (JEMS) is a deep Cycle 1 imaging survey program using 5 medium-band filters at 2 and 4 micron (F182M, F210M, F430M, F460M, F480M). With two NIRCam detector footprints (using all 5 filters) and one NIRISS imaging footprint (using F430M and F480M filters), the data total 15.6 square arcminutes with integration times 13915-27830 seconds, including full coverage of the Hubble Ultra Deep Field (HUDF), building on the deepest multi-wavelength public datasets available anywhere on the sky. These science-ready mosaics, which reach 5σ point source limits (ABmag) of ∼29.2 in 2μm filters and ∼28.2-28.6 at 4μm. Our chosen filters create a JWST imaging survey in the UDF that enables novel analysis of a range of spectral features potentially across the redshift range of 0.3 < z < 20, including Paschen-α, Hα+[N II], and [O III]+Hβ emission at high spatial resolution.