10-1093-MNRAS-STV2141.pdf.pdf (993.45 kB)
Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters
journal contribution
posted on 2023-06-09, 01:54 authored by Kathy RomerKathy Romer, et al The DES CollaborationWe 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 lambda-mass relation with the following function ? Blambdaln M500 + Clambdaln E(z) and use SPT-SZ cluster masses and RM richnesses lambda to constrain the parameters. We find B_lambda = 1.14^{+0.21}_{-0.18} and C_lambda =0.73^{+0.77}_{-0.75}. The associated scatter in mass at fixed richness is sigma _{ln M|lambda } = 0.18^{+0.08}_{-0.05} at a characteristic richness lambda = 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 xi = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with xi ? [4, 4.5].
Funding
Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices Of The Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Volume
454Page range
2305-2319Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-06-27First Open Access (FOA) Date
2016-06-27First Compliant Deposit (FCD) Date
2016-06-27Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC