__smbhome.uscs.susx.ac.uk_ar628_Documents_SRO_Journals_Kathy Romer 4-Published-5.08.19.pdf (6.01 MB)
Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT
journal contribution
posted on 2023-06-09, 18:42 authored by T Shin, S Adhikari, E J Baxter, C Chang, B Jain, N Battaglia, L Bleem, S Bocquet, J DeRose, D Gruen, M Hilton, A Kravtsov, T McClintock, E Rozo, E S Rykoff, T N Varga, RH Wechsler, H Wu, Z Zhang, Kathy RomerKathy Romer, othersWe 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 ~2s 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.
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
OUPExternal DOI
Issue
2Volume
487Page range
2900-2918Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-08-28First Open Access (FOA) Date
2019-08-28First Compliant Deposit (FCD) Date
2019-08-27Usage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC