A LABOCA Survey of the ECDF-S - the Submillimeter Properties of Near-Infrared Selected Galaxies

The 330 hr ESO-MPG 870 Am survey of the Extended Chandra Deep Field South (ECDF-S) obtained with the Large Apex BOlometer CAmera (LABOCA) on the Atacama Pathfinder EXperiment (APEX), was used to carry out a stacking analysis at 870 mu m of a sample of 8266 K(vega) <= 20 selected galaxies from the Multi-wavelength Survey by Yale-Chile (MUSYC). Subsamples of 744 starforming BzK galaxies (sBzKs), 1253 extremely red objects (EROs) and 737 distant red galaxies (DRGs) all have significant stacked submm signals. A delineation of the average submm signal from K(vega) <= 20 selected galaxies as a function of (photometric) redshift, and find a decline in the average submm signal (and therefore IR luminosity and star formation rate) by a factor, similar to 2 - 3 from z similar to 2 to z similar to 0. This is in line with a cosmic star formation history in which the star formation activity in galaxies increases significantly at z greater than or similar to 1. By mapping the stacked 870 mu m signal across the B-z vs. z-K diagram we have confirmed the ability of the sBzK-selection criterion to select starforming galaxies at z > 1.5.