The HectoMAP Redshift Survey: First Data Release

Sohn, Jubee; Geller, Margaret J.; Hwang, Ho Seong; Fabricant, Daniel G.; Moran, Sean M.; Utsumi, Yousuke

doi:10.3847/1538-4357/abd9be

The HectoMAP Redshift Survey: First Data Release

Journal Article · Thu Mar 11 00:00:00 EST 2021 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/abd9be· OSTI ID:1776785

^[1]; ^[1]; ^[2]; Fabricant, Daniel G. ^[1]; ^[1]; ^[3]

Smithsonian Astrophysical Observatory, Cambridge, MA (United States)
Korea Astronomy and Space Science Inst., Daejeon (South Korea)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology

HectoMAP is a dense, red-selected redshift survey to a limiting r = 21.3 mag covering 55 deg² in a contiguous 1fdg5 strip across the northern sky. This region is also covered by the Subaru/Hyper Suprime-Cam (HSC) Subaru Strategic Program photometric survey enabling a range of applications that combine a dense foreground redshift survey with both strong and weak lensing maps. The median redshift of HectoMAP exceeds 0.3 throughout the survey region, and the mean density of the redshift survey is ~2000 galaxies deg^-2. Here we report a total of 17,313 redshifts in a first data release covering 8.7 deg². Additionally, we include the derived quantities D_n4000 and stellar mass for nearly all of the objects. Among these galaxies, 8117 constitute a 79% complete red-selected subsample with r ≤ 20.5 mag, and an additional 4318 constitute a 68% complete red-selected subsample with 20.5 < r(mag) < 21.3. As examples of the strengths of HectoMAP data, we discuss two applications: refined membership of redMaPPer photometrically selected clusters and a test of HSC photometric redshifts. We highlight a remarkable redMaPPer strong lensing system. The comparison of photometric redshifts with spectroscopic redshifts in a dense survey uncovers subtle systematic issues in the photometric redshifts.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1776785

Alternate ID(s):: OSTI ID: 23163166

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 909; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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