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Two millimeter observations of the MACS J1149.6+2223 cluster have detected asource that was consistent with the location of the lensed MACS1149-JD galaxyat z=9.6. A positive identification would have rendered this galaxy as theyoungest dust forming galaxy in the universe. Follow up observation with theAzTEC 1.1 mm camera and the IRAM NOrthern Extended Millimeter Array (NOEMA) at1.3 mm have not confirmed this association. In this paper we show that theNOEMA observations associate the 2 mm source with [PCB2012] 2882 ([PCB2012]2882 is the NED-searchable name for this source.), source number 2882 in theHubble Space Telescope ( HST) Cluster Lensing and Supernova (CLASH) catalog ofMACS J1149.6+2223. This source, hereafter referred to as CLASH 2882, is agravitationally lensed spiral galaxy at z=0.99. We combine the GISMO 2 mm andNOEMA 1.3 mm fluxes with other (rest frame) UV to far-IR observations toconstruct the full spectral energy distribution (SED) of this galaxy, andderive its star formation history, and stellar and interstellar dust content.The current star formation rate of the galaxy is 54/mu Msun yr-1, and its dustmass is about 5 10^7/mu Msun, where mu is the lensing magnification factor forthis source, which has a mean value of 2.7. The inferred dust mass is higherthan the maximum dust mass that can be produced by core collapse supernovae(CCSN) and evolved AGB stars. As with many other star forming galaxies, most ofthe dust mass in CLASH 2882 must have been accreted in the dense phases of theISM.

Submillimeter Observations of CLASH 2882 and the Evolution of Dust in this Galaxy