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Title: Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters

Abstract

In this study, we cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg 2 of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 ≲ z ≲ 0.8 in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness λ-mass relation with the following function 500> ∝ B λlnM 500 + C λlnE(z) and use SPT-SZ cluster masses and RM richnesses λ to constrain the parameters. We find B λ = 1.14 +0.21 –0.18 and C λ = 0.73 +0.77 –0.75. The associated scatter in mass at fixed richness is σ lnM|λ = 0.18 +0.08 –0.05 at a characteristic richness λ = 70. We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ-selected clusters with RM counterparts is consistent with expectations and that the fraction of RM-selected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of twomore » Gaussians, showing that it is consistent with a dominant, centrally peaked population and a subdominant population characterized by larger offsets. We also cross-match the RM catalogue with SPT-SZ candidates below the official catalogue threshold significance ξ = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with ξ ϵ [4, 4.5].« less

Authors:
 [1]
  1. Ludwig-Maximilians-Univ., Muenchen (Germany); Excellence Cluster Universe, Garching (Germany). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
DES
OSTI Identifier:
1212689
Alternate Identifier(s):
OSTI ID: 1246801
Report Number(s):
FERMILAB-PUB-15-295-AE; BNL-111978-2016-JA
Journal ID: ISSN 0035-8711; arXiv eprint number arXiv:1506.07814
Grant/Contract Number:  
AC02-07CH11359; SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 454; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; catalogues; methods: data analysis; galaxies: abundances; galaxies: clusters: general; galaxies: haloes; galaxies: statistics; cosmology: miscellaneous; large-scale structure of Universe

Citation Formats

Saro, A. Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters. United States: N. p., 2015. Web. doi:10.1093/mnras/stv2141.
Saro, A. Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters. United States. doi:10.1093/mnras/stv2141.
Saro, A. Mon . "Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters". United States. doi:10.1093/mnras/stv2141. https://www.osti.gov/servlets/purl/1212689.
@article{osti_1212689,
title = {Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters},
author = {Saro, A.},
abstractNote = {In this study, we cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg2 of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 ≲ z ≲ 0.8 in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness λ-mass relation with the following function 500> ∝ BλlnM500 + CλlnE(z) and use SPT-SZ cluster masses and RM richnesses λ to constrain the parameters. We find Bλ = 1.14+0.21–0.18 and Cλ = 0.73+0.77–0.75. The associated scatter in mass at fixed richness is σlnM|λ = 0.18+0.08–0.05 at a characteristic richness λ = 70. We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ-selected clusters with RM counterparts is consistent with expectations and that the fraction of RM-selected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of two Gaussians, showing that it is consistent with a dominant, centrally peaked population and a subdominant population characterized by larger offsets. We also cross-match the RM catalogue with SPT-SZ candidates below the official catalogue threshold significance ξ = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with ξ ϵ [4, 4.5].},
doi = {10.1093/mnras/stv2141},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 454,
place = {United States},
year = {2015},
month = {10}
}

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    Works referencing / citing this record:

    A matched filter approach for blind joint detection of galaxy clusters in X-ray and SZ surveys
    journal, June 2018