First results from HerMES on the evolution of the submillimetre luminosity function
S. Eales (Cardiff), G. Raymond, I. G. Roseboom, B. Altieri, A., Amblard, V. Arumugam, R. Auld, H. Aussel, T. Babbedge, A. Blain, J. Bock, A., Boselli, D. Brisbin, V. Buat, D. Burgarella, N. Castro-Rodriguez, A. Cava, P., Chanial, D. L. Clements, A. Conley, L. Conversi, A. Cooray
TL;DR
This study uses deep Herschel SPIRE surveys at 250 microns to analyze the evolution of the luminosity function up to redshift 2, revealing significant evolution up to z=1 and limited change beyond, implying most star formation occurred at z<1.4.
Contribution
First to provide observational evidence on the evolution of the 250-micron luminosity function up to z=2 using Herschel data.
Findings
Strong evolution of luminosity function up to z=1
Limited evolution beyond z=1
Most stars and metals formed at z<1.4 in spiral galaxies
Abstract
We have carried out two extremely deep surveys with SPIRE, one of the two cameras on Herschel, at 250 microns, close to the peak of the far-infrared background. We have used the results to investigate the evolution of the rest-frame 250-micron luminosity function out to z=2. We find evidence for strong evolution out to a redshift of around 1 but evidence for at most weak evolution beyond this redshift. Our results suggest that a significant part of the stars and metals in the Universe today were formed at z<1.4 in spiral galaxies.
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