A Planck-selected dusty proto-cluster at z=2.16 associated with a strong over-density of massive Hα emitting galaxies
Date Issued
2021
Author(s)
Yusei Koyama
•
•
Ichi Tanaka
•
Tadayuki Kodama
•
Hervé Dole
•
Geneviève Soucail
•
Brenda Frye
•
Matt Lehnert
•
Abstract
We discovered an over-density of H-alpha-emitting galaxies associated with a
Planck compact source in the COSMOS field (PHzG237.0+42.5) through narrow-band
imaging observations with Subaru/MOIRCS. This Planck-selected dusty
proto-cluster at z=2.16 has 38 H-alpha emitters including six spectroscopically
confirmed galaxies in the observed MOIRCS 4'x7' field (corresponding to
~2.0x3.5~Mpc^2 in physical scale). We find that massive H-alpha emitters with
log(M*/Msun)>10.5 are strongly clustered in the core of the proto-cluster
(within ~300-kpc from the density peak of the H-alpha emitters). Most of the
H-alpha emitters in this proto-cluster lie along the star-forming main sequence
using H-alpha-based SFR estimates, whilst the cluster total SFR derived by
integrating the H-alpha-based SFRs is an order of magnitude smaller than those
estimated from Planck/Herschel FIR photometry. Our results suggest that H-alpha
is a good observable for detecting moderately star-forming galaxies and tracing
the large-scale environment in and around high-z dusty proto-clusters, but
there is a possibility that a large fraction of star formation could be
obscured by dust and undetected in H-alpha observations.
Volume
503
Issue
1
Start page
L1
Issn Identifier
1745-3925
Ads BibCode
2021MNRAS.503L...1K
Rights
open.access
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