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.

doi:10.1093/mnras/stw1237

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.

Authors

Y. Kato

Y. Matsuda

Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor

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

Professor David Alexander d.m.alexander@durham.ac.uk
Professor

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.

Citation

Kato, Y., Matsuda, Y., Smail, I., Swinbank, A., Hatsukade, B., Umehata, H., …Hayashino, T. (2016). Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z = 2–3. Monthly Notices of the Royal Astronomical Society, 460(4), 3861-3872. https://doi.org/10.1093/mnras/stw1237

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
Related Public URLs	http://adsabs.harvard.edu/abs/2016MNRAS.tmp..901K

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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.