SCUBA-2 ultra deep imaging EAO survey (STUDIES). v. confusion-limited submillimeter galaxy number counts at 450 μm and data release for the COSMOS field
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Published version
Author(s)
Type
Journal Article
Abstract
We present confusion-limited SCUBA-2 450 μm observations in the COSMOS-CANDELS region as part of the James Clerk Maxwell Telescope Large Program SCUBA-2 Ultra Deep Imaging EAO Survey. Our maps at 450 and 850 μm cover an area of 450 arcmin2. We achieved instrumental noise levels of σ450=0.59mJybeam−1 and σ850 = 0.09 mJy beam−1 in the deepest area of each map. The corresponding confusion noise levels are estimated to be 0.65 and 0.36 mJy beam−1. Above the 4σ (3.5σ) threshold, we detected 360 (479) sources at 450μm and 237 (314) sources at 850 μm. We derive the deepest blank-field number counts at 450μm, covering the flux-density range of 2–43mJy. These are in agreement with other SCUBA-2 blank-field and lensing-cluster observations but are lower than various model counts. We compare the counts with those in other fields and find that the field-to-field variance observed at 450 μm at the R = 6' scale is consistent with Poisson noise, so there is no evidence of strong 2D clustering at this scale. Additionally, we derive the integrated surface brightness at 450 μm down to 2.1 mJy to be 57.3± 1.0 6.2
Jy deg⁻2, contributing to 41% ± 4% of the 450μm extragalactic background light (EBL) measured by Cosmic Background Explorer and Planck. Our results suggest that the 450μm EBL may be fully resolved at 0.08 ±0.09 0.08
mJy, which extremely deep lensing-cluster observations and next-generation submillimeter instruments with large aperture sizes may be able to achieve.
Jy deg⁻2, contributing to 41% ± 4% of the 450μm extragalactic background light (EBL) measured by Cosmic Background Explorer and Planck. Our results suggest that the 450μm EBL may be fully resolved at 0.08 ±0.09 0.08
mJy, which extremely deep lensing-cluster observations and next-generation submillimeter instruments with large aperture sizes may be able to achieve.
Date Issued
2024-08-10
Date Acceptance
2024-05-29
Citation
The Astrophysical Journal (ApJ), 2024, 971 (1)
ISSN
0004-637X
Publisher
IOP Publishing
Journal / Book Title
The Astrophysical Journal (ApJ)
Volume
971
Issue
1
Copyright Statement
© 2024. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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Subjects
ALMA SPECTROSCOPIC SURVEY
Astronomy & Astrophysics
FORMATION HISTORY
LEGACY SURVEY
LENSING CLUSTERS
MULTIWAVELENGTH PROPERTIES
Physical Sciences
PHYSICAL-PROPERTIES
REDSHIFT DISTRIBUTION
Science & Technology
SOURCE CATALOG
STAR-FORMING GALAXIES
X-RAY LUMINOSITY
Publication Status
Published
Article Number
117
Date Publish Online
2024-08-09