TY - JOUR
T1 - LoCuSS
T2 - Scaling relations between galaxy cluster mass, gas, and stellar content
AU - Mulroy, Sarah L.
AU - Farahi, Arya
AU - Evrard, August E.
AU - Smith, Graham P.
AU - Finoguenov, Alexis
AU - O'Donnell, Christine
AU - Marrone, Daniel P.
AU - Abdulla, Zubair
AU - Bourdin, Herve
AU - Carlstrom, John E.
AU - Democles, Jessica
AU - Haines, Chris P.
AU - Martino, Rossella
AU - Mazzotta, Pasquale
AU - McGee, Sean L.
AU - Okabe, Nobuhiro
N1 - Publisher Copyright:
© 2018 The Author(s).
PY - 2019/3/21
Y1 - 2019/3/21
N2 - We present a simultaneous analysis of galaxy cluster scaling relations between weak-lensing mass and multiple cluster observables, across a wide range of wavelengths, that probe both gas and stellar content. Our new hierarchical Bayesian model simultaneously considers the selection variable alongside all other observables in order to explicitly model intrinsic property covariance and account for selection effects. We apply this method to a sample of 41 clusters at 0.15 < z < 0.30, with a well-defined selection criteria based on RASS X-ray luminosity, and observations from Chandra/XMM, SZA, Planck, UKIRT, SDSS, and Subaru. These clusters have well-constrained weak-lensing mass measurements based on Subaru/SuprimeCam observations, which serve as the reference masses in our model. We present 30 scaling relation parameters for 10 properties. All relations probing the intracluster gas are slightly shallower than self-similar predictions, in moderate tension with prior measurements, and the stellar fraction decreases with mass. K-band luminosity has the lowest intrinsic scatter with a 95th percentile of 0.16, while the lowest scatter gas probe is gas mass with a fractional intrinsic scatter of 0.16 ± 0.03. We find no distinction between the core-excised X-ray or highresolution Sunyaev-Zel'dovich relations of clusters of different central entropy, but find with modest significance that higher entropy clusters have higher stellar fractions than their lower entropy counterparts. We also report posterior mass estimates from our likelihood model.
AB - We present a simultaneous analysis of galaxy cluster scaling relations between weak-lensing mass and multiple cluster observables, across a wide range of wavelengths, that probe both gas and stellar content. Our new hierarchical Bayesian model simultaneously considers the selection variable alongside all other observables in order to explicitly model intrinsic property covariance and account for selection effects. We apply this method to a sample of 41 clusters at 0.15 < z < 0.30, with a well-defined selection criteria based on RASS X-ray luminosity, and observations from Chandra/XMM, SZA, Planck, UKIRT, SDSS, and Subaru. These clusters have well-constrained weak-lensing mass measurements based on Subaru/SuprimeCam observations, which serve as the reference masses in our model. We present 30 scaling relation parameters for 10 properties. All relations probing the intracluster gas are slightly shallower than self-similar predictions, in moderate tension with prior measurements, and the stellar fraction decreases with mass. K-band luminosity has the lowest intrinsic scatter with a 95th percentile of 0.16, while the lowest scatter gas probe is gas mass with a fractional intrinsic scatter of 0.16 ± 0.03. We find no distinction between the core-excised X-ray or highresolution Sunyaev-Zel'dovich relations of clusters of different central entropy, but find with modest significance that higher entropy clusters have higher stellar fractions than their lower entropy counterparts. We also report posterior mass estimates from our likelihood model.
KW - Cosmology: observations
KW - Galaxies: clusters: general
KW - Galaxies: clusters: intracluster medium
KW - Galaxies: stellar content
KW - Gravitational lensing: weak
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U2 - 10.1093/mnras/sty3484
DO - 10.1093/mnras/sty3484
M3 - Article
AN - SCOPUS:85067042375
SN - 0035-8711
VL - 484
SP - 60
EP - 80
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -