HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey - catalogue, number counts and early results

Author(s): V. Asboth, A Conley, J. Sayers, Matthieu Bethermin, S. C. Chapman, Helmut Dannerbauer
Abstract: Selecting sources with rising flux densities towards longer wavelengths from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, but the previously available catalogues made this way are limited by small survey areas. Here we apply a map-based search method to 274 deg² of the Herschel Multi-tiered Extragalactic Survey (HerMES) Large Mode Survey and create a catalogue of 477 objects with SPIRE flux densities S₅₀₀ > S₃₅₀ > S₂₅₀ and a 5σ cut-off S₅₀₀ > 52 mJy. From this catalogue we determine that the total number of these `red' sources is at least an order of magnitude higher than predicted by galaxy evolution models. These results are in agreement with previous findings in smaller HerMES fields; however, due to our significantly larger sample size we are also able to investigate the shape of the red source counts for the first time. We have obtained spectroscopic redshift measurements for two of our sources using the Atacama Large Millimeter/submillimeter Array. The redshifts z = 5.1 and 3.8 confirm that with our selection method we can indeed find high-redshift dusty star-forming galaxies.
Organisation(s): Department of Astrophysics
External organisation(s): University of British Columbia (UBC), California Institute of Technology (Caltech), European Southern Observatory (Germany), Dalhousie University, University of Colorado, Boulder
Journal: Monthly Notices of the Royal Astronomical Society
Volume: 462
Pages: 1989 - 2000
No. of pages: 12
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stw1769
Publication date: 10-2016
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/23342f55-2a42-4f49-8084-35b51eaad908

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