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We present an 880 micron Submillimeter Array (SMA) detection of thesubmillimeter galaxy SXDF850.6. SXDF850.6 is a bright source (S(850 micron) = 8mJy) detected in the SCUBA Half Degree Extragalactic Survey (SHADES), and hasmultiple possible radio counterparts in its deep radio image obtained at theVLA. Our new SMA detection finds that the submm emission coincides with thebrightest radio emission that is found ~8" north of the coordinates determinedfrom SCUBA. Despite the lack of detectable counterparts in deep UV/opticalimages, we find a source at the SMA position in near-infrared and longerwavelength images. We perform SED model fits to UV-optical-IR photometry (u, B,V, R, i', z', J, H, K, 3.6 micron, 4.5 micron, 5.8 micron, and 8.0 micron) andto submm-radio photometry (850 micron, 880 micron, 1100 micron, and 21 cm)independently, and we find both are well described by starburst templates at aredshift of z ~= 2.2 (+/- 0.3). The best-fit parameters from the UV-optical-IRSED fit are a redshift of z = 1.87 (+0.15/-0.07), a stellar mass of M_star =2.5 +2.2/-0.3 x 10^11 M_sun, an extinction of A_V = 3.0 (+0.3/-1.0) mag, and anage of 720 (+1880/-210) Myr. The submm-radio SED fit provides a consistentredshift of z ~ 1.8-2.5, an IR luminosity of L_IR = (7-26) x 10^12 L_sun, and astar formation rate of 1300-4500 M_sun/yr. These results suggest that SXDF850.6is a mature system already having a massive amount of old stellar populationconstructed before its submm bright phase and is experiencing a dustystarburst, possibly induced by major mergers.

Unveiling the Nature of Submillimeter Galaxy SXDF850.6