2019A&A...621A..40E


Query : 2019A&A...621A..40E

2019A&A...621A..40E - Astronomy and Astrophysics, volume 621A, 40-40 (2019/1-1)

Non-thermal pressure support in X-COP galaxy clusters.

ECKERT D., GHIRARDINI V., ETTORI S., RASIA E., BIFFI V., POINTECOUTEAU E., ROSSETTI M., MOLENDI S., VAZZA F., GASTALDELLO F., GASPARI M., DE GRANDI S., GHIZZARDI S., BOURDIN H., TCHERNIN C. and RONCARELLI M.

Abstract (from CDS):

Galaxy clusters are the endpoints of structure formation and are continuously growing through the merging and accretion of smaller structures. Numerical simulations predict that a fraction of their energy content is not yet thermalized, mainly in the form of kinetic motions (turbulence, bulk motions). Measuring the level of non-thermal pressure support is necessary to understand the processes leading to the virialization of the gas within the potential well of the main halo and to calibrate the biases in hydrostatic mass estimates. We present high-quality measurements of hydrostatic masses and intracluster gas fraction out to the virial radius for a sample of 13 nearby clusters with available XMM-Newton and Planck data. We compare our hydrostatic gas fractions with the expected universal gas fraction to constrain the level of non-thermal pressure support. We find that hydrostatic masses require little correction and infer a median non-thermal pressure fraction of ∼6% and ∼10% at R500 and R200, respectively. Our values are lower than the expectations of hydrodynamical simulations, possibly implying a faster thermalization of the gas. If instead we use the mass calibration adopted by the Planck team, we find that the gas fraction of massive local systems implies a mass bias 1-b=0.85±0.05 for Sunyaev-Zeldovich-derived masses, with some evidence for a mass-dependent bias. Conversely, the high bias required to match Planck cosmic microwave background and cluster count cosmology is excluded by the data at high significance, unless the most massive halos are missing a substantial fraction of their baryons.

Abstract Copyright: © ESO 2019

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

Simbad objects: 15

goto Full paper

goto View the references in ADS

Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 844 0
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2116 1
3 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 284 0
4 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 388 0
5 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 210 0
6 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 647 1
7 NAME Hya A LIN 09 18 05.6783347248 -12 05 43.634531472   14.38 14.8     ~ 963 1
8 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 114 0
9 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 346 1
10 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 896 0
11 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 718 0
12 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 535 0
13 2MAXI J1825+306 ClG 18 25 22.8 +30 26 32           ~ 37 0
14 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 436 1
15 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 595 1

To bookmark this query, right click on this link: simbad:objects in 2019A&A...621A..40E and select 'bookmark this link' or equivalent in the popup menu


2022.09.26-01:19:26

© Université de Strasbourg/CNRS

    • Contact