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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

J. M. Simpson ; A. M. Swinbank ; I. Smail ; D. M. Alexander ; W. N. Brandt ; F. Bertoldi ; C. De Breuck ; S. C. Chapman ; K. E. K. Coppin ; E. da Cunha ; A. L. R. Danielson ; H. Dannerbauer ; T. R. Greve ; J. A. Hodge ; R. J. Ivison ; A. Karim ; Kirsten Kraiberg Knudsen (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; B. M. Poggianti ; E. Schinnerer ; A. P. Thomson ; F. Walter ; J. L. Wardlow ; A. Weiss ; P. P. van der Werf
Astrophysical Journal (0004-637X). Vol. 788 (2014), 2,
[Artikel, refereegranskad vetenskaplig]

We present the first photometric redshift distribution for a large sample of 870 mu m submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z(phot) = 2.3 +/- 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z similar to 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to zphot = 2.5 +/- 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z >= 3 is at most 35% +/- 5% of the total population. We derive a median stellar mass of M star = (8 +/- 1) x 10(10) M circle dot, although there are systematic uncertainties of up to 5 x for individual sources. Assuming that the star formation activity in SMGs has a timescale of similar to 100 Myr, we show that their descendants at z similar to 0 would have a space density and MH distribution that 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.

Nyckelord: galaxies: evolution, galaxies: high-redshift, galaxies: starburst, STAR-FORMING GALAXIES, DEGREE EXTRAGALACTIC SURVEY, X-RAY SOURCES, SIMILAR-TO 2, OLD STELLAR POPULATIONS, FAR-INFRARED PROPERTIES, YALE-CHILE MUSYC, 1.4 GHZ SURVEY, BLACK-HOLES, PHOTOMETRIC REDSHIFT



Denna post skapades 2014-07-21. Senast ändrad 2015-01-19.
CPL Pubid: 200617

 

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