Iono, DPeck, ABPope, ABorys, CScott, DWilner, DJGurwell, MHo, PTPYun, MinMatsushita, SPetitpas, GRDunlop, JSElvis, MBlain, ALe Floc'h, E2024-04-262024-04-262006-01-01https://doi.org/10.1086/503290https://hdl.handle.net/20.500.14394/3109<p>This is the pre-published version harvested from ArXiv. The published version is located at <a href="http://iopscience.iop.org/1538-4357/640/1/L1/">http://iopscience.iop.org/1538-4357/640/1/L1/</a></p>We present high-resolution 890 μm images of two 20 mJy submillimeter galaxies, SMM J123711+622212 and MIPS J142824.0+352619, obtained using the Submillimeter Array (SMA). Using submillimeter interferometric observations with an angular resolution of 25, the coordinates of these high-redshift sources are determined with an accuracy of 02. The new SMA data on SMM J123711+622212 reveal an unresolved submillimeter source offset to the east by 08 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 hyperluminous (LFIR = 3.2 × 1013 L) source MIPS J142824.0+352619 provides a firm upper limit to the source size of 12. This constraint provides evidence that the foreground lens is only weakly affecting the observed high far-infrared luminosity.cosmology : observationsgalaxies : formationgalaxies : high-redshiftgalaxies : starburstsubmillimeterAstrophysics and Astronomyarticle