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We present deep optical 18-medium-band photometry from the Subaru telescopeover the ~30' x 30' Extended Chandra Deep Field-South (ECDF-S), as part of theMultiwavelength Survey by Yale-Chile (MUSYC). This field has a wealth ofground- and space-based ancillary data, and contains the GOODS-South field andthe Hubble Ultra Deep Field. We combine the Subaru imaging with existingUBVRIzJHK and Spitzer IRAC images to create a uniform catalog. Detectingsources in the MUSYC BVR image we find ~40,000 galaxies with R_AB<25.3, themedian 5 sigma limit of the 18 medium bands. Photometric redshifts aredetermined using the EAZY code and compared to ~2000 spectroscopic redshifts inthis field. The medium band filters provide very accurate redshifts for the(bright) subset of galaxies with spectroscopic redshifts, particularly at 0.1 <z < 1.2 and at z > 3.5. For 0.1 < z < 1.2, we find a 1 sigma scatter in \Deltaz/(1+z) of 0.007, similar to results obtained with a similar filter set in theCOSMOS field. As a demonstration of the data quality, we show that the redsequence and blue cloud can be cleanly identified in rest-frame color-magnitudediagrams at 0.1 < z < 1.2. We find that ~20% of the red-sequence-galaxies showevidence of dust-emission at longer rest-frame wavelengths. The reduced images,photometric catalog, and photometric redshifts are provided through the publicMUSYC website.

The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Medium-Band optical imaging and high quality 32-band photometric redshifts in the ECDF-S