Date Published:August 1, 2006
We use the NICMOS Treasury and ACS HUDF images to measure theextinction-corrected star formation history for 4681 galaxies in theregion common to both images using the star formation rate distributionfunction and other techniques similar to those employed with the NICMOSand WFPC2 images in the HDFN. Unlike the HDFN, the NICMOS region of theHUDF appears to lack highly luminous and high star formation rategalaxies at redshifts beyond 3. The HUDF provides a region that iscompletely uncorrelated to the HDFN and therefore provides anindependent measure of the star formation history of the universe. Thecombined HUDF and HDFN star formation rates show an average rate of 0.2Msolar yr-1 Mpc-3. The average SFR ofthe combined fields at z=1-3 is 0.29 Msolar yr-1Mpc-3, while the average at z=4-6 is 1.2 Msolaryr-1 Mpc-3. The SFRs at all redshifts are within 3σ of the average over all redshifts.