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Title: Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT

Abstract

We present a detection of the splashback feature around galaxy clusters selected using the Sunyaev-Zel'dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, rsp, is smaller than predicted by N-body simulations. A possible explanation for this discrepancy is that rsp inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these cluster samples with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced biases, potentially ameliorating causes of systematic error for optically selected clusters. We find that the measured r sp for SZ-selected clusters is consistent with the expectations from simulations, although the small number of SZ-selected clusters makes a precise comparison difficult. In agreement with previous work, when using opticallymore » selected redMaPPer clusters with similar mass and redshift distributions, r sp is ~2σ smaller than in the simulations. These results motivate detailed investigations of selection biases in optically selected cluster catalogues and exploration of the splashback feature around larger samples of SZ-selected clusters. Additionally, we investigate trends in the galaxy profile and splashback feature as a function of galaxy colour, finding that blue galaxies have profiles close to a power law with no discernible splashback feature, which is consistent with them being on their first infall into the cluster.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of High Energy Physics; National Science Foundation (NSF)
OSTI Identifier:
1574985
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 487; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English

Citation Formats

Shin, T., Adhikari, S., Baxter, E. J., Chang, C., Jain, B., Battaglia, N., Bleem, L., Bocquet, S., DeRose, J., Gruen, D., and Carlstrom, J. E. Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT. United States: N. p., 2019. Web. doi:10.1093/mnras/stz1434.
Shin, T., Adhikari, S., Baxter, E. J., Chang, C., Jain, B., Battaglia, N., Bleem, L., Bocquet, S., DeRose, J., Gruen, D., & Carlstrom, J. E. Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT. United States. doi:10.1093/mnras/stz1434.
Shin, T., Adhikari, S., Baxter, E. J., Chang, C., Jain, B., Battaglia, N., Bleem, L., Bocquet, S., DeRose, J., Gruen, D., and Carlstrom, J. E. Thu . "Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT". United States. doi:10.1093/mnras/stz1434.
@article{osti_1574985,
title = {Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT},
author = {Shin, T. and Adhikari, S. and Baxter, E. J. and Chang, C. and Jain, B. and Battaglia, N. and Bleem, L. and Bocquet, S. and DeRose, J. and Gruen, D. and Carlstrom, J. E.},
abstractNote = {We present a detection of the splashback feature around galaxy clusters selected using the Sunyaev-Zel'dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, rsp, is smaller than predicted by N-body simulations. A possible explanation for this discrepancy is that rsp inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these cluster samples with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced biases, potentially ameliorating causes of systematic error for optically selected clusters. We find that the measured rsp for SZ-selected clusters is consistent with the expectations from simulations, although the small number of SZ-selected clusters makes a precise comparison difficult. In agreement with previous work, when using optically selected redMaPPer clusters with similar mass and redshift distributions, rsp is ~2σ smaller than in the simulations. These results motivate detailed investigations of selection biases in optically selected cluster catalogues and exploration of the splashback feature around larger samples of SZ-selected clusters. Additionally, we investigate trends in the galaxy profile and splashback feature as a function of galaxy colour, finding that blue galaxies have profiles close to a power law with no discernible splashback feature, which is consistent with them being on their first infall into the cluster.},
doi = {10.1093/mnras/stz1434},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {0035-8711},
number = 2,
volume = 487,
place = {United States},
year = {2019},
month = {8}
}

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