MUSYC: A Deep Square Degree Survey of the Formation and Evolution of Galaxies and Supermassive Black Holes

The Multiwavelength Survey by Yale-Chile (MUSYC) is optimized for the study of galaxies at z=3, AGN demographics, and Galactic structure. MUSYC consists of deep optical (UBVRIz') and near-infrared (JHK) imaging of four fields on the sky covering 1.2 square degrees to AB limiting depths of U, B, V, R=26 and K=22. Our optical catalog contains 277,341 objects detected in BVR images with median seeing of 0.9''. Satellite coverage of our fields includes Chandra, XMM, GALEX, HST}/ACS, and Spitzer, with the Extended Chandra Deep Field South imaged at all of these wavelengths plus the radio, making it the premier multiwavelength field on the sky. Detailed follow-up spectroscopy is being performed with VLT+VIMOS, Magellan+IMACS, and Gemini+GNIRS. MUSYC provides ideal supporting data for surveys with z-machines and rich target lists for spectroscopy with ALMA. We are conducting a census of protogalaxies at redshift three (Lyman break galaxies, Lyman α emitters, distant red galaxies, sub-millimeter galaxies, and AGN) in order to separate physical properties from selection effects. We discuss measurements of the dark matter halo masses and halo occupation numbers of these populations and of the total cosmic star formation rate at z=3. MUSYC publications and data releases are available at http://www.astro.yale.edu/MUSYC/.