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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/20.500.12386/24331
Title: How does our choice of observable influence our estimation of the centre of a galaxy cluster? Insights from cosmological simulations
Authors: Cui, Weiguang
Power, Chris
BIFFI, VERONICA
BORGANI, STEFANO 
MURANTE, Giuseppe 
Fabjan, Dunja
Knebe, Alexander
Lewis, Geraint F.
Poole, Greg B.
Issue Date: 2016
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 456
Issue: 3
First Page: 2566
Abstract: Galaxy clusters are an established and powerful test-bed for theories of both galaxy evolution and cosmology. Accurate interpretation of cluster observations often requires robust identification of the location of the centre. Using a statistical sample of clusters drawn from a suite of cosmological simulations in which we have explored a range of galaxy formation models, we investigate how the location of this centre is affected by the choice of observable - stars, hot gas, or the full mass distribution as can be probed by the gravitational potential. We explore several measures of cluster centre: the minimum of the gravitational potential, which would expect to define the centre if the cluster is in dynamical equilibrium; the peak of the density; the centre of brightest cluster galaxy (BCG); and the peak and centroid of X-ray luminosity. We find that the centre of BCG correlates more strongly with the minimum of the gravitational potential than the X-ray defined centres, while active galactic nuclei feedback acts to significantly enhance the offset between the peak X-ray luminosity and minimum gravitational potential. These results highlight the importance of centre identification when interpreting clusters observations, in particular when comparing theoretical predictions and observational data.
URI: http://hdl.handle.net/20.500.12386/24331
URL: https://academic.oup.com/mnras/article/456/3/2566/1099321
ISSN: 0035-8711
DOI: 10.1093/mnras/stv2839
Bibcode ADS: 2016MNRAS.456.2566C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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