Interferometric 890 μm Images of High-Redshift Submillimeter Galaxies

We present high resolution 890µm images of two 20 mJy submillimeter galaxies, SMMJ123711+622212 and MIPS J142824.0+352619, obtained using the Submillimeter Array (SMA). Using submillimeter interferometric observations with an angular resolution of 2. ′ ′ 5, the coordinates of these high redshift sources are determined with an accuracy of 0. ′ ′ 2. The new SMA data on SMMJ123711+622212 reveal an unresolved submm source offset to the east by 0. ′ ′ 8 from an optical galaxy found in deep HST images, suggesting either a large galaxy with a dusty central region, or an interacting galaxy system. The SMA image of hyper-luminous (LFIR = 3.2 × 10 13 L⊙) source MIPS J142824.0+352619 provides a firm upper limit to the source size of � 1. ′ ′ 2. This constraint provides evidence that the foreground lens is only weakly affecting the observed high FIR luminosity.