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Paper: Radio Emission and Properties of Spitzer Selected Starbursts at z ~ 2
Volume: 407, The Low-Frequency Radio Universe
Page: 142
Authors: Omont, A.; Fiolet, N.; Polletta, M.; Owen, F.; Lonsdale, C.; Berta, S.; the SWIMAMBO Collaboration
Abstract: Our recent observations at IRAM with 1.2mm bolometer cameraMAMBO have confirmed the possibility of identifying a subclass of starburst ULIRGs at z ~2, mostly Sub-Millimeter Galaxies (SMGs), in Spitzer wide surveys through their 24μm emission and the characteristic 1.6 μm stellar maximum redshifted into the IRAC bands (Lonsdale et al. 2009, Fiolet et al. in preparation). These 1.2mm observations include a complete sample of 33 such sources with F24 μm > 400 μJy in a 0.5 deg2 field with exceptionally deep 1.4 GHz VLA and 610MHz GMRT data. The entire sample has an average 1.2mm flux of 1.56±0.14 mJy, and the average far-IR luminosity is 2.5×1012 Lʘ, so that most of the sources are z ~ 2 ULIRGs and the majority may be considered SMGs. The combination of radio, mm and Spitzer data allows the discrimination between AGN and starburst sources and estimating the star formation rate and the stellar mass of these objects. There are several thousand galaxies easily identifiable among SWIRE galaxies with similar criteria. They could be progenitors of massive ellipticals in the process of one of their last major gaseous mergers, with possibly extended starburst. These results show the power of combining radio, mm/submm and Spitzer data. Very deep radio data will thus be crucial for analyzing various wide field surveys with Herschel.
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