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

Ghirardini, V., Ettori, S., Eckert, D., & Molendi, S. (2019). Polytropic state of the intracluster medium in the X-COP cluster sample. Astronomy and Astrophysics, 627: A19. doi:10.1051/0004-6361/201834875.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-8D66-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-8D67-A
Genre: Journal Article

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Ghirardini, V., Author
Ettori, S., Author
Eckert, D.1, Author              
Molendi, S., Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 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. 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) × 10−3 cm−3 E2(z). We find that above 0.2 R500 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.

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 Dates: 2019-06-01
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201834875
Other: LOCALID: 3156226
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 627 Sequence Number: A19 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1