Evolution of cosmic star formation in the SCUBA-2 Cosmology Legacy Survey
| dc.contributor.author | Bourne, N. | en |
| dc.contributor.author | Dunlop, J. S. | en |
| dc.contributor.author | Merlin, E. | en |
| dc.contributor.author | Parsa, S. | en |
| dc.contributor.author | Schreiber, C. | en |
| dc.contributor.author | Castellano, M. | en |
| dc.contributor.author | Conselice, C. J. | en |
| dc.contributor.author | Coppin, K. E. K. | en |
| dc.contributor.author | Farrah, D. | en |
| dc.contributor.author | Fontana, A. | en |
| dc.contributor.author | Geach, J. E. | en |
| dc.contributor.author | Halpern, M. | en |
| dc.contributor.author | Knudsen, K. K. | en |
| dc.contributor.author | Michalowski, M. J. | en |
| dc.contributor.author | Mortlock, A. | en |
| dc.contributor.author | Santini, P. | en |
| dc.contributor.author | Scott, D. | en |
| dc.contributor.author | Shu, X. W. | en |
| dc.contributor.author | Simpson, C. | en |
| dc.contributor.author | Simpson, J. M. | en |
| dc.contributor.author | Smith, D. J. B. | en |
| dc.contributor.author | Werf, P. V. D. | en |
| dc.contributor.department | Physics | en |
| dc.date.accessioned | 2017-02-24T17:15:58Z | en |
| dc.date.available | 2017-02-24T17:15:58Z | en |
| dc.date.issued | 2017-01 | en |
| dc.description.abstract | 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 230arcmin$^2$ 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 multi-wavelength 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 $z\sim5$, 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 $M_\ast>10^{10}M_\odot$ 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 $L^\ast_{UV}$), 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 $z\lesssim3$, and from UV-only data at $z\sim5$. The cosmic star-formation history undergoes a transition at $z\sim3-4$, 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. | en |
| dc.description.notes | MNRAS Accepted 2017 January 5. 29 pages, 18 figures | en |
| dc.identifier.doi | https://doi.org/10.1093/mnras/stx031 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/75143 | en |
| dc.relation.uri | http://arxiv.org/abs/1607.04283v3 | en |
| dc.relation.uri | http://dx.doi.org/10.1093/mnras/stx031 | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject | astro-ph.GA | en |
| dc.subject | astro-ph.IM | en |
| dc.title | Evolution of cosmic star formation in the SCUBA-2 Cosmology Legacy Survey | en |
| dc.type | Article | en |
| pubs.organisational-group | /Virginia Tech | en |
| pubs.organisational-group | /Virginia Tech/All T&R Faculty | en |
| pubs.organisational-group | /Virginia Tech/Science | en |
| pubs.organisational-group | /Virginia Tech/Science/COS T&R Faculty | en |
| pubs.organisational-group | /Virginia Tech/Science/Physics | en |