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Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z = 2–3

Kato, Y.; Matsuda, Y.; Smail, I.; Swinbank, A.M.; Hatsukade, B.; Umehata, H.; Tanaka, I.; Saito, T.; Iono, D.; Tamura, Y.; Kohno, K.; Erb, D.K.; Lehmer, B.D.; Geach, J.E.; Steidel, C.C.; Alexander, D.M.; Yamada, T.; Hayashino, T.

Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z = 2–3 Thumbnail


Authors

Y. Kato

Y. Matsuda

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

T. Yamada

T. Hayashino



Abstract

We present a Herschel/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′ (∼ 2.2 Mpc) from a density peak of Hα emitters at z = 2.2. In the HS1700 field, we found a 5σ overdensity of eight SPIRE sources around 2.1′ (∼ 1.0 Mpc) from a density peak of LBGs at z = 2.3. We did not find any significant overdensities in SSA22 field, but we found three 500 μm sources are concentrated 3′ (∼1.4 Mpc) east to the LAEs 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.

Journal Article Type Article
Acceptance Date May 19, 2016
Online Publication Date May 23, 2016
Publication Date Aug 21, 2016
Deposit Date May 31, 2016
Publicly Available Date Jun 15, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 460
Issue 4
Pages 3861-3872
DOI https://doi.org/10.1093/mnras/stw1237
Public URL https://durham-repository.worktribe.com/output/1380147
Related Public URLs http://adsabs.harvard.edu/abs/2016MNRAS.tmp..901K

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Copyright Statement
Advance online version This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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