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.

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
• Public URL: https://durham-repository.worktribe.com/output/1380147
• Related Public URLs: http://adsabs.harvard.edu/abs/2016MNRAS.tmp..901K