University of Hertfordshire

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  • 1605.07370

    Accepted author manuscript, 928 KB, PDF document

  • Y. Kato
  • Y. Matsuda
  • Ian Smail
  • A. M. Swinbank
  • B. Hatsukade
  • H. Umehata
  • I. Tanaka
  • T. Saito
  • D. Iono
  • Y. Tamura
  • K. Kohno
  • D. K. Erb
  • B. D. Lehmer
  • J. E. Geach
  • C. C. Steidel
  • D. M. Alexander
  • T. Yamada
  • T. Hayashino
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Original languageEnglish
Pages (from-to)3861-3872
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume460
Issue4
Early online date23 May 2016
DOIs
Publication statusPublished - 21 Aug 2016

Abstract

We present a Herschel/Spectral and Photometric Imaging Receiver (SPIRE) survey of three protoclusters at z = 2-3 (2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S350/S250 and S500/S350) of 250 μm sources, we selected high-redshift dusty star-forming galaxies potentially associated with the protoclusters. In the 2QZCluster field, we found a 4σ overdensity of six SPIRE sources around 4.5 arcmin (~2.2 Mpc) from a density peak of H α emitters at z = 2.2. In the HS1700 field, we found a 5σ overdensity of eight SPIRE sources around 2.1 arcmin (~1.0 Mpc) from a density peak of Lyman-break galaxies at z = 2.3. We did not find any significant overdensities in SSA22 field, but we found three 500 μm sources are concentrated 3 arcmin (~1.4 Mpc) east to the Ly α emitters overdensity. If all the SPIRE sources in these three overdensities are associated with protoclusters, the inferred star formation rate densities are 103-104 times higher than the average value at the same redshifts. This suggests that dusty star formation activity could be very strongly enhanced in z ~ 2-3 protoclusters. Further observations are needed to confirm the redshifts of the SPIRE sources and to investigate what processes enhance the dusty star formation activity in z ~ 2-3 protoclusters.

Notes

This is a pre-copy edited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The Version of Record (Y. Kato, et al, 'Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z+2-3', MNRAS, Vol. 460 (4): 3861-3872, May 2016) is available online at doi: https://doi.org/10.1093/mnras/stw1237. Published by Oxford University Press on behalf of the Royal Astronomical Society.

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