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Evolution of cosmic star formation in the SCUBA-2 Cosmology Legacy Survey

N. Bourne ; J. S. Dunlop ; E. Merlin ; S. Parsa ; C. Schreiber ; M. Castellano ; C. J. Conselice ; K. E. K. Coppin ; D. Farrah ; A. Fontana ; J. E. Geach ; M. Halpern ; Kirsten Kraiberg Knudsen (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. J. Michalowski ; A. Mortlock ; P. Santini ; D. Scott ; X. W. Shu ; C. Simpson ; J. M. Simpson ; D. J. B. Smith ; P. P. van der Werf
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 467 (2017), 2, p. 1360-1385.
[Artikel, refereegranskad vetenskaplig]

We present a new exploration of the cosmic star formation history and dust obscuration in massive galaxies at redshifts 0.5 < z < 6. We utilize the deepest 450-and 850-mu m imaging from SCUBA-2 CLS, covering 230 arcmin(2) in the AEGIS, COSMOS and UDS fields, together with 100-250 mu m imaging from Herschel. We demonstrate the capability of the T-PHOT deconfusion code to reach below the confusion limit, using multiwavelength prior catalogues from CANDELS/3D-HST. By combining IR and UV data, we measure the relationship between total star formation rate (SFR) and stellar mass up to z similar to 5, indicating that UV-derived dust corrections underestimate the SFR in massive galaxies. We investigate the relationship between obscuration and the UV slope (the IRX-beta relation) in our sample, which is similar to that of low-redshift starburst galaxies, although it deviates at high stellar masses. Our data provide new measurements of the total SFR density (SFRD) in M-* > 10(10) M-O galaxies at 0.5 < z < 6. This is dominated by obscured star formation by a factor of > 10. One third of this is accounted for by 450 mu m-detected sources, while one-fifth is attributed to UV-luminous sources (brighter than L-UV(*)), although even these are largely obscured. By extrapolating our results to include all stellar masses, we estimate a total SFRD that is in good agreement with previous results from IR and UV data at z <= 3, and from UV-only data at z similar to 5. The cosmic star formation history undergoes a transition at z similar to 3-4, as predominantly unobscured growth in the early Universe is overtaken by obscured star formation, driven by the build-up of the most massive galaxies during the peak of cosmic assembly.

Nyckelord: methods: statistical, galaxies: high-redshift, submillimetre: diffuse background, submillimetre

Denna post skapades 2017-05-05.
CPL Pubid: 249125


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)


Astronomi, astrofysik och kosmologi

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