S. Giodini
Stellar and total baryon mass fractions in groups and clusters since Redshift 1
Giodini, S.; Pierini, D.; Finoguenov, A.; Pratt, G.W.; Boehringer, H.; Leauthaud, A.; Guzzo, L.; Aussel, H.; Bolzonella, M.; Capak, P.; Elvis, M.; Hasinger, G.; Ilbert, O.; Kartaltepe, J.S.; Koekemoer, A.M.; Lilly, S.J.; Massey, R.; McCracken, H.J.; Rhodes, J.; Salvato, M.; Sanders, D.B.; Scoville, N.Z.; Sasaki, S.; Smolcic, V.; Taniguchi, Y.; Thompson, D.; Collaboration, COSMOS
Authors
D. Pierini
A. Finoguenov
G.W. Pratt
H. Boehringer
A. Leauthaud
L. Guzzo
H. Aussel
M. Bolzonella
P. Capak
M. Elvis
G. Hasinger
O. Ilbert
J.S. Kartaltepe
A.M. Koekemoer
S.J. Lilly
Professor Richard Massey r.j.massey@durham.ac.uk
Professor
H.J. McCracken
J. Rhodes
M. Salvato
D.B. Sanders
N.Z. Scoville
S. Sasaki
V. Smolcic
Y. Taniguchi
D. Thompson
COSMOS Collaboration
Abstract
We investigate if the discrepancy between estimates of the total baryon mass fraction obtained from observations of the cosmic microwave background (CMB) and of galaxy groups/clusters persists when a large sample of groups is considered. To this purpose, 91 candidate X-ray groups/poor clusters at redshift 0.1 ≤ z ≤ 1 are selected from the COSMOS 2 deg2 survey, based only on their X-ray luminosity and extent. This sample is complemented by 27 nearby clusters with a robust, analogous determination of the total and stellar mass inside R 500. The total sample of 118 groups and clusters with z ≤ 1 spans a range in M 500 of ~1013-1015 M ☉. We find that the stellar mass fraction associated with galaxies at R 500 decreases with increasing total mass as M –0.37 ± 0.04 500, independent of redshift. Estimating the total gas mass fraction from a recently derived, high-quality scaling relation, the total baryon mass fraction (f stars+gas 500 = f stars 500 + f gas 500) is found to increase by ~25%, when M 500 increases from langMrang = 5 × 1013 M ☉ to langMrang = 7 × 1014 M ☉. After consideration of a plausible contribution due to intracluster light (11%-22% of the total stellar mass) and gas depletion through the hierarchical assembly process (10% of the gas mass), the estimated values of the total baryon mass fraction are still lower than the latest CMB measure of the same quantity (WMAP5), at a significance level of 3.3σ for groups of langMrang = 5 × 1013 M ☉. The discrepancy decreases toward higher total masses, such that it is 1σ at langMrang = 7 × 1014 M ☉. We discuss this result in terms of nongravitational processes such as feedback and filamentary heating.
Citation
Giodini, S., Pierini, D., Finoguenov, A., Pratt, G., Boehringer, H., Leauthaud, A., …Collaboration, C. (2009). Stellar and total baryon mass fractions in groups and clusters since Redshift 1. Astrophysical Journal, 703(1), 982-993. https://doi.org/10.1088/0004-637x/703/1/982
Journal Article Type | Article |
---|---|
Publication Date | Sep 20, 2009 |
Deposit Date | Mar 21, 2013 |
Publicly Available Date | Feb 11, 2015 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 703 |
Issue | 1 |
Article Number | 982 |
Pages | 982-993 |
DOI | https://doi.org/10.1088/0004-637x/703/1/982 |
Keywords | Cosmological parameters, Cosmology: observations, Diffuse radiation, Galaxies: clusters: general, Galaxies: stellar content, X-rays: galaxies: clusters. |
Files
Published Journal Article
(1.1 Mb)
PDF
Copyright Statement
© 2009. The American Astronomical Society. All rights reserved.
You might also like
Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses
(2023)
Journal Article
Data Downloaded via Parachute from a NASA Super-Pressure Balloon
(2023)
Journal Article
A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons
(2023)
Journal Article
RXJ0437+00: constraining dark matter with exotic gravitational lenses
(2023)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search