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The eXtreme Deep Field (XDF) combines data from ten years of observationswith the HST Advanced Camera for Surveys (ACS) and the Wide-Field Camera 3Infra-Red (WFC3/IR) into the deepest image of the sky ever in theoptical/near-IR. Since the initial observations on the Hubble Ultra-Deep Field(HUDF) in 2003, numerous surveys and programs, including supernova followup,HUDF09, CANDELS, and HUDF12 have contributed additional imaging data across theHUDF region. Yet these have never been combined and made available as onecomplete ultra-deep optical and near-infrared image dataset. We do so now forthe eXtreme Deep Field (XDF) program. Our new and improved processingtechniques provide higher quality reductions of the total dataset. All WFC3near-IR and optical ACS data sets have been fully combined and accuratelymatched, resulting in the deepest imaging ever taken at these wavelengthsranging from 29.1 to 30.3 AB mag (5sigma in a 0.35" diameter aperture) in 9filters. The gains in the optical for the four filters done in the original ACSHUDF correspond to a typical improvement of 0.15 mag, with gains of 0.25 mag inthe deepest areas. Such gains are equivalent to adding ~130 to ~240 orbits ofACS data to the HUDF. Improved processing alone results in a typical gain of~0.1 mag. Our 5sigma (optical+near-IR) SExtractor catalogs reveal about 14140sources in the full field and about 7121 galaxies in the deepest part of theXDF (the HUDF09 region). The XDF is the deepest image of the universe evertaken, reaching, in the combined image for a flat f_nu source, to 31.2 AB mag5sigma (32.9 at 1sigma) in a 0.35" diameter aperture.

The HST eXtreme Deep Field XDF: Combining all ACS and WFC3/IR Data on the HUDF Region into the Deepest Field Ever