An optical observational cluster mass function at z~1 with the ORELSE survey
Date Issued
2021
Author(s)
Hung, D.
•
Lemaux, B. C.
•
Gal, R. R.
•
Tomczak, A. R.
•
Lubin, L. M.
•
•
Pelliccia, D.
•
Shen, L.
•
Le Fèvre, O.
•
Zamorani, G.
•
Wu, P. -F.
•
Kocevski, D. D.
•
Fassnacht, C. D.
•
Squires, G. K.
Abstract
We present a new mass function of galaxy clusters and groups using optical/near-infrared (NIR) wavelength spectroscopic and photometric data from the Observations of Redshift Evolution in Large-Scale Environments (ORELSE) survey. At z~1, cluster mass function studies are rare regardless of wavelength and have never been attempted from an optical/NIR perspective. This work serves as a proof of concept that z~1 cluster mass functions are achievable without supplemental X-ray or Sunyaev-Zel'dovich data. Measurements of the cluster mass function provide important contraints on cosmological parameters and are complementary to other probes. With ORELSE, a new cluster finding technique based on Voronoi tessellation Monte Carlo (VMC) mapping, and rigorous purity and completeness testing, we have obtained ~240 galaxy overdensity candidates in the redshift range 0.55 < z < 1.37 at a mass range of 13.6 < log(M/M_sun) < 14.8. This mass range is comparable to existing optical cluster mass function studies for the local universe. Our candidate numbers vary based on the choice of multiple input parameters related to detection and characterization in our cluster finding algorithm, which we incorporated into the mass function analysis through a Monte Carlo scheme. We find cosmological constraints on the matter density, Omega_m, and the amplitude of fluctuations, sigma_8, of Omega _m = 0.250^{+0.104}_{-0.099} and sigma _8 = 1.150^{+0.260}_{-0.163}. While our Omega_m value is close to concordance, our sigma_8 value is ~2sigma higher because of the inflated observed number densities compared to theoretical mass function models owing to how our survey targeted overdense regions. With Euclid and several other large, unbiased optical surveys on the horizon, VMC mapping will enable optical/NIR cluster cosmology at redshifts much higher than what has been possible before.
Volume
502
Issue
3
Start page
3942
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.502.3942H
Rights
open.access
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