2022A&A...657L...1E


Query : 2022A&A...657L...1E

2022A&A...657L...1E - Astronomy and Astrophysics, volume 657, L1-1 (2022/1-1)

Tracing the non-thermal pressure and hydrostatic bias in galaxy clusters.

ETTORI S. and ECKERT D.

Abstract (from CDS):

We present a modelization of the non-thermal pressure, PNT, and we apply it to the X-ray (and Sunayev-Zel'dovich) derived radial profiles of the X-COP galaxy clusters. We relate the amount of non-thermal pressure support to the hydrostatic bias, b, and speculate on how we can interpret this PNT in terms of the expected levels of turbulent velocity and magnetic fields. Current upper limits on the turbulent velocity in the intracluster plasma are used to build a distribution N(< b)-b, from which we infer that 50 per cent of local galaxy clusters should have b < 0.2 (b < 0.33 in 80 per cent of the population). The measured bias in the X-COP sample that includes relaxed massive nearby systems is 0.03 in 50% of the objects and 0.17 in 80% of them. All these values are below the amount of bias required to reconcile the observed cluster number count in the cosmological framework set from Planck.

Abstract Copyright: © ESO 2021

Journal keyword(s): galaxies: clusters: intracluster medium - X-rays: galaxies: clusters - galaxies: clusters: general - dark matter - methods: analytical

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 856 0
2 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 290 0
3 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 397 0
4 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 216 0
5 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 118 0
6 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 354 1
7 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1220 0
8 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 909 0
9 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 734 0
10 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 546 0
11 CIZA J1825.3+3026 ClG 18 25 22.8 +30 26 32           ~ 42 0
12 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 442 1

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2023.01.31-00:43:32

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