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http://hdl.handle.net/20.500.12386/24331
Titolo: | How does our choice of observable influence our estimation of the centre of a galaxy cluster? Insights from cosmological simulations | Autori: | Cui, Weiguang Power, Chris BIFFI, VERONICA BORGANI, STEFANO MURANTE, Giuseppe Fabjan, Dunja Knebe, Alexander Lewis, Geraint F. Poole, Greg B. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 456 | Fascicolo: | 3 | Da pagina:: | 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 |
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