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Measuring star formation rates (SFRs) in high-z galaxies with theirrest-frame ultraviolet (UV) continuum can be uncertain because of dustobscuration. Prior studies had used the submillimeter emission at 850 um todetermine the intrinsic SFRs of rest-frame UV selected galaxies, but theresults suffered from the low sensitivity and poor resolution (~15''). Here, weuse ultradeep Very Large Array 1.4 GHz images with ~1''-2'' resolutions tomeasure the intrinsic SFRs. We perform stacking analyses in the radio imagescentered on ~3500 Lyman break galaxies (LBGs) at z~4 in the Great ObservatoriesOrigins Deep Survey-North and South fields selected with Hubble SpaceTelescope/Advanced Camera for Surveys data. The stacked radio flux is very low,0.08+/-0.15 uJy, implying a mean SFR of 6+/-11 M/yr. This is comparable to theuncorrected mean UV SFRs of 5 M/yr, implying that the z~4 LBGs have little dustextinction. The low SFR and dust extinction support the previous results thatz~4 LBGs are in general not submillimeter galaxies. We further show that thereis no statistically significant excess of dust-hidden star-forming componentswithin ~22 kpc from the LBGs.

Dust Obscuration in Lyman Break Galaxies at z~4