2019A&A...627A..19G


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET01:39:28

2019A&A...627A..19G - Astronomy and Astrophysics, volume 627A, 19-19 (2019/7-1)

Polytropic state of the intracluster medium in the X-COP cluster sample.

GHIRARDINI V., ETTORI S., ECKERT D. and MOLENDI S.

Abstract (from CDS):

Aims. In this work, we have investigated the relation between the radially resolved thermodynamic quantities of the intracluster medium in the X-COP cluster sample, aiming to assess the stratification properties of the ICM. Methods. We modeled the relations between radius, gas temperature, density, and pressure using a combination of power-laws, also evaluating the intrinsic scatter in these relations. Results. We show that the gas pressure is remarkably well correlated to the density, with very small scatter. Also the temperature correlates with gas density with similar scatter. The slopes of these relations have values that show a clear transition from the inner cluster regions to the outskirts. This transition occurs at the radius rt=0.19(±0.04)R500 and electron density nt=(1.91±0.21)x10–3cm–3E2(z). We find that above 0.2R500 the radial thermodynamic profiles are accurately reproduced by a well defined and physically motivated framework, where the dark matter follows the NFW potential and the gas is represented by a polytropic equation of state. By modeling the gas temperature dependence upon both the gas density and radius, we propose a new method to reconstruct the hydrostatic mass profile based only on the relatively inexpensive measurement of the gas density profile.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: clusters: intracluster medium - galaxies: clusters: general - X-rays: galaxies: clusters - intergalactic medium

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 - 2021
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 797 0
2 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 273 0
3 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 373 0
4 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 204 0
5 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 106 0
6 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 337 1
7 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1170 0
8 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 865 0
9 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 681 0
10 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 506 0
11 2MAXI J1825+306 ClG 18 25 22.8 +30 26 32           ~ 28 0
12 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 419 1

    Equat.    Gal    SGal    Ecl

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2020.11.28-01:39:28

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