Baryon content of massive galaxy clusters at 0.57
© 2015 The Authors. We study the stellar, brightest cluster galaxy (BCG) and intracluster medium (ICM) masses of 14 South Pole Telescope (SPT) selected galaxy clusters with median redshift z = 0.9 and mass M500 = 6 × 1014M⊙. We estimate stellar masses for each cluster and BCG using six photometric b...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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Format: | Article |
Language: | English |
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Oxford University Press (OUP),
2021-10-27T20:04:08Z.
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Online Access: | Get fulltext |
LEADER | 03087 am a22004453u 4500 | ||
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042 | |a dc | ||
100 | 1 | 0 | |a Chiu, I |e author |
700 | 1 | 0 | |a Mohr, J |e author |
700 | 1 | 0 | |a McDonald, M |e author |
700 | 1 | 0 | |a Bocquet, S |e author |
700 | 1 | 0 | |a Ashby, MLN |e author |
700 | 1 | 0 | |a Bayliss, M |e author |
700 | 1 | 0 | |a Benson, BA |e author |
700 | 1 | 0 | |a Bleem, LE |e author |
700 | 1 | 0 | |a Brodwin, M |e author |
700 | 1 | 0 | |a Desai, S |e author |
700 | 1 | 0 | |a Dietrich, JP |e author |
700 | 1 | 0 | |a Forman, WR |e author |
700 | 1 | 0 | |a Gangkofner, C |e author |
700 | 1 | 0 | |a Gonzalez, AH |e author |
700 | 1 | 0 | |a Hennig, C |e author |
700 | 1 | 0 | |a Liu, J |e author |
700 | 1 | 0 | |a Reichardt, CL |e author |
700 | 1 | 0 | |a Saro, A |e author |
700 | 1 | 0 | |a Stalder, B |e author |
700 | 1 | 0 | |a Stanford, SA |e author |
700 | 1 | 0 | |a Song, J |e author |
700 | 1 | 0 | |a Schrabback, T |e author |
700 | 1 | 0 | |a Šuhada, R |e author |
700 | 1 | 0 | |a Strazzullo, V |e author |
700 | 1 | 0 | |a Zenteno, A |e author |
245 | 0 | 0 | |a Baryon content of massive galaxy clusters at 0.57 |
260 | |b Oxford University Press (OUP), |c 2021-10-27T20:04:08Z. | ||
856 | |z Get fulltext |u https://hdl.handle.net/1721.1/134242 | ||
520 | |a © 2015 The Authors. We study the stellar, brightest cluster galaxy (BCG) and intracluster medium (ICM) masses of 14 South Pole Telescope (SPT) selected galaxy clusters with median redshift z = 0.9 and mass M500 = 6 × 1014M⊙. We estimate stellar masses for each cluster and BCG using six photometric bands, the ICM mass using X-ray observations and the virial masses using the SPT Sunyaev-Zel'dovich effect signature. At z = 0.9, the BCG mass M*BCG constitutes 0.12 ± 0.01 per cent of the halo mass for a 6 × 1014M⊙ cluster, and this fraction falls as M 500-0.58±0.07. The cluster stellar mass function has a characteristic mass M0 = 1011.0 ± 0.1M⊙, and the number of galaxies per unit mass in clusters is larger than in the field by a factor of 1.65 ± 0.20. We combine our SPT sample with previously published samples at low redshift and correct to a common initial mass function and for systematic virial mass differences. We then explore mass and redshift trends in the stellar fraction f*, the ICM fraction fICM, the collapsed baryon fraction fc and the baryon fraction fb. At a pivot mass of 6 × 1014M⊙ and redshift z = 0.9, the characteristic values are f* = 1.1 ± 0.1 per cent, fICM = 9.6 ± 0.5 per cent, fc = 10.7 ± 1.1 per cent and fb = 10.7 ± 0.6 per cent. These fractions all vary with cluster mass at high significance, with higher mass clusters having lower f* and fc and higher fICM and fb. When accounting for a 15 per cent systematic virial mass uncertainty, there is no statistically significant redshift trend at fixed mass. Our results support the scenario where clusters grow through accretion from subclusters (higher f*, lower fICM) and the field (lower f*, higher fICM), balancing to keep f* and fICM approximately constant since z ~ 0.9. | ||
546 | |a en | ||
655 | 7 | |a Article | |
773 | |t 10.1093/MNRAS/STV2303 | ||
773 | |t Monthly Notices of the Royal Astronomical Society |