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        An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South : The Redshift Distribution and Evolution of Submillimeter Galaxies

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        Simpson_2014_ApJ_788_125.pdf (PDF, 4Mb)
        Author
        Simpson, James
        Swinbank, Mark
        Smail, Ian
        Alexander, Dave
        Brandt, Niel
        Bertoldi, Frank
        Breuck, Carlos de
        Chapman, Scott
        Coppin, Kristen
        Cunha, Elisabete da
        Danielson, Alice
        Dannerbauer, Helmut
        Greve, Thomas
        Hodge, Jackie
        Ivison, Rob
        Karim, Alex
        Knudsen, Kirsten
        Poggianti, Bianca
        Schinnerer, Eva
        Thomson, Alasdair
        Walter, Fabian
        Wardlow, Julie
        Weiss, Axel
        Werf, Paul van der
        Attention
        2299/22371
        Abstract
        We present the first photometric redshift distribution for a large unbiased sample of 870um selected submillimeter galaxies (SMGs) with robust identifications based on observations with the Atacama Large Millimeter Array (ALMA). In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band, optical-near-infrared, photometry. We model the Spectral Energy Distributions (SEDs) for these 77 SMGs, deriving a median photometric redshift of z=2.3+/-0.1. The remaining 19 SMGs have insufficient optical or near-infrared photometry to derive photometric redshifts, but a stacking analysis of IRAC and Herschel observations confirms they are not spurious. Assuming these sources have an absolute H-band magnitude distribution comparable to that of a complete sample of z~1-2 SMGs, we demonstrate that the undetected SMGs lie at higher redshifts, raising the median redshift for SMGs to z=2.5+/-0.2. More critically we show that the proportion of galaxies undergoing an SMG phase at z>3 is 35+/-5% of the total population. We derive a median stellar mass for SMGs of Mstar=(8+/-1)x10^10Mo, but caution that there are significant systematic uncertainties in our stellar mass estimate, up to x5 for individual sources. We compare our sample of SMGs to a volume-limited, morphologically classified sample of ellipticals in the local Universe. Assuming the star formation activity in SMGs has a timescale of ~100Myr we show that their descendants at z~0 would have a space density and M_H distribution which are in good agreement with those of local ellipticals. In addition the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.
        Publication date
        2013-10-23
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.1088/0004-637X/788/2/125
        Other links
        http://hdl.handle.net/2299/22371
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