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A simulated tCDM cosmology cluster catalogue: the NFW profile and the temperature-mass scaling relations

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posted on 2023-06-07, 14:46 authored by Peter ThomasPeter Thomas, O Muanwong, F R Pearce, H M P Couchman, A C Edge, A Jenkins, L Onuora
We have extracted over 400 clusters, covering more than two decades in mass, from three simulations of the tCDM cosmology. This represents the largest uniform catalogue of simulated clusters ever produced. The clusters exhibit a wide variety of density profiles. Only a minority are well-fitted in their outer regions by the widely used density profile of Navarro, Frenk & White (NFW), which is applicable to relaxed haloes. Others have steeper outer density profiles, show sharp breaks in their density profiles, or have significant substructure. If we force a fit to the NFW profile, then the best-fitting concentrations decline with increasing mass, but this is driven primarily by an increase in substructure as one moves to higher masses. The temperature–mass relations for properties measured within a sphere enclosing a fixed overdensity all follow the self-similar form, T?M2/3; however, the normalization is lower than the value inferred for observed clusters. The temperature–mass relations for properties measured within a fixed physical radius are significantly steeper then this. Both can be accurately predicted using the NFW model.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

2

Volume

324

Page range

450-462

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2008-10-01

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-17

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