2016A&A...592A..12E


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.28CEST14:38:02

2016A&A...592A..12E - Astronomy and Astrophysics, volume 592A, 12-12 (2016/8-1)

The XXL Survey. XIII. Baryon content of the bright cluster sample.

ECKERT D., ETTORI S., COUPON J., GASTALDELLO F., PIERRE M., MELIN J.-B., LE BRUN A.M.C., McCARTHY I.G., ADAMI C., CHIAPPETTI L., FACCIOLI L., GILES P., LAVOIE S., LEFEVRE J.P., LIEU M., MANTZ A., MAUGHAN B., McGEE S., PACAUD F., PALTANI S., SADIBEKOVA T., SMITH G.P. and ZIPARO F.

Abstract (from CDS):

Traditionally, galaxy clusters have been expected to retain all the material accreted since their formation epoch. For this reason, their matter content should be representative of the Universe as a whole, and thus their baryon fraction should be close to the Universal baryon fraction Ωbm. We make use of the sample of the 100 brightest galaxy clusters discovered in the XXL Survey to investigate the fraction of baryons in the form of hot gas and stars in the cluster population. Since it spans a wide range of mass (1013-1015M) and redshift (0.05-1.1) and benefits from a large set of multiwavelength data, the XXL-100-GC sample is ideal for measuring the global baryon budget of massive halos. We measure the gas masses of the detected halos and use a mass-temperature relation directly calibrated using weak-lensing measurements for a subset of XXL clusters to estimate the halo mass. We find that the weak-lensing calibrated gas fraction of XXL-100-GC clusters is substantially lower than was found in previous studies using hydrostatic masses. Our best-fit relation between gas fraction and mass reads fgas,500=0.055–0.006+0.007(M500/1014M)0.21(–0.10+0.11). The baryon budget of galaxy clusters therefore falls short of the Universal baryon fraction by about a factor of two at r500,MT. Our measurements require a hydrostatic bias 1-b=MX/MWL=0.72–0.07+0.08 to match the gas fraction obtained using lensing and hydrostatic equilibrium, which holds independently of the instrument considered. Comparing our gas fraction measurements with the expectations from numerical simulations, we find that our results favour an extreme feedback scheme in which a significant fraction of the baryons are expelled from the cores of halos. This model is, however, in contrast with the thermodynamical properties of observed halos, which might suggest that weak-lensing masses are overestimated. In light of these results, we note that a mass bias 1-b=0.58 as required to reconcile Planck cosmic microwave background and cluster counts should translate into an even lower baryon fraction, which poses a major challenge to our current understanding of galaxy clusters.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: clusters: general - galaxies: groups: general - X-rays: galaxies: clusters - large-scale structure of Universe - galaxies: clusters: intracluster medium

Status at CDS:  

Simbad objects: 23

goto Full paper

goto View the reference in ADS

Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 329 ClG 02 14 40.900 -04 33 21.90           ~ 33 0
2 2XLSSd J021524.1-034332 ClG 02 15 23.99 -03 43 32.2           ~ 23 0
3 XCLASS 343 ClG 02 15 29 -04 40.9           ~ 11 0
4 ACO 334 ClG 02 16 12.2 -04 14 31           ~ 13 0
5 2XLSSd J022045.3-032556 ClG 02 20 45.46 -03 25 59.7           ~ 20 0
6 ACT-CL J0221.7-0346 ClG 02 21 45.8 -03 46 08           ~ 37 0
7 [RRB2014] RM J022156.4-054531.5 ClG 02 21 56 -05 45.4           ~ 11 0
8 2XLSSd J022206.8-030314 ClG 02 22 06.85 -03 03 14.5           ~ 15 0
9 2XLSSd J022404.2-041331 ClG 02 24 04.19 -04 13 26.6           ~ 39 0
10 XLSSC 062 ClG 02 24 14 -02 43.3           ~ 5 0
11 XMMXCS J0224.9-0348 ClG 02 24 57.1 -03 48 53           ~ 26 0
12 XLSSC 054 ClG 02 25 17 -05 53.3           ~ 7 0
13 RzCS 262 ClG 02 25 24.6 -04 40 45       17.3   ~ 33 0
14 2MASX J02253077-0414183 GrG 02 25 30.6 -04 14 20           ~ 31 0
15 XLSSU J022540.6-031121 ClG 02 25 40.6 -03 11 21           ~ 16 0
16 XCLASS 342 ClG 02 25 48 -05 53.7           ~ 11 0
17 NPM1G -05.0105 G 02 26 09.6703118869 -04 58 05.658450961   16.11   14.75   ~ 23 0
18 XLSSC 011 ClG 02 26 10.60 -04 58 11.5           ~ 23 0
19 XCLASS 38 ClG 02 26 16.3 -02 39 57           ~ 10 0
20 2XLSSd J022722.4-032145 ClG 02 27 22.39 -03 21 39.2           ~ 23 0
21 2XLSSd J022738.1-031802 ClG 02 27 38.20 -03 17 56.9           ~ 21 0
22 [BPR2008] WL07 ClG 02 27 40.3 -04 51 31           ~ 29 0
23 RzCS 185 ClG 02 28 03.4 -04 51 03           ~ 24 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...592A..12E and select 'bookmark this link' or equivalent in the popup menu


2020.05.28-14:38:02

© Université de Strasbourg/CNRS

    • Contact