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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28887
Title: Polytropic state of the intracluster medium in the X-COP cluster sample
Authors: Ghirardini, V.
ETTORI, STEFANO 
Eckert, D.
MOLENDI, SILVANO 
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 627
First Page: A19
Abstract: 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. <BR /> 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 r<SUB>t</SUB> = 0.19(±0.04) R<SUB>500</SUB> and electron density n<SUB>t</SUB> = (1.91 ± 0.21) × 10<SUP>-3</SUP> cm<SUP>-3</SUP> E<SUP>2</SUP>(z). We find that above 0.2 R<SUB>500</SUB> 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.
URI: http://hdl.handle.net/20.500.12386/28887
URL: https://www.aanda.org/articles/aa/full_html/2019/07/aa34875-18/aa34875-18.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201834875
Bibcode ADS: 2019A&A...627A..19G
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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