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Discovery of a Lensed Ultrabright Submillimeter Galaxy at z=2.0439

Diaz-Sanchez, A.; Iglesias-Groth, S.; Rebolo, R.; Dannerbauer, H.

ASTROPHYSICAL JOURNAL LETTERS
2017
VL / 843 - BP / - EP /
abstract
We report an ultrabright lensed submillimeter galaxy SMG) at z = 2.0439, WISE J132934.18+ 224327.3, identified as a result of a full-sky cross-correlation of the AllWISE and Planck compact source catalogs aimed to search for bright analogs of the SMG SMM J2135, the Cosmic Eyelash. Inspection of archival SCUBA-2 observations of the candidates revealed a source with fluxes (S-850 mu m = 130 mJy) consistent with the Planck measurements. The centroid of the SCUBA-2 source coincides within 1 arcsec with the position of the AllWISE mid-IR source, and, remarkably, with an arc-shaped lensed galaxy in HST images at visible wavelengths. Lowresolution rest-frame UV-optical spectroscopy of this lensed galaxy obtained with 10.4 m GTC reveals the typical absorption lines of a starburst galaxy. Gemini-N near-IR spectroscopy provided a clear detection of H-alpha emission. The lensed source appears to be gravitationally magnified by a massive foreground galaxy cluster lens at z = 0.44; modeling with Lenstool indicates a lensing amplification factor of 11 +/- 2. We determine an intrinsic rest-frame 8-1000 mu m luminosity, L-IR, of (1.3 +/- 0.1) x 10(13) L-circle dot, and a likely star formation rate SFR) of similar to 500-2000 M-circle dot yr(-1). The SED shows a remarkable similarity with the Cosmic Eyelash from optical-mid/ IR to submillimeter/ radio, albeit at higher fluxes.

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