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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/20.500.12386/26836
Title: The Fraction of Cool-core Clusters in X-Ray versus SZ Samples Using Chandra Observations
Authors: Andrade-Santos, Felipe
Jones, Christine
Forman, William R.
LOVISARI, LORENZO
Vikhlinin, Alexey
van Weeren, Reinout J.
Murray, Stephen S.
Arnaud, Monique
Pratt, Gabriel W.
Démoclès, Jessica
Kraft, Ralph
Mazzotta, Pasquale
Böhringer, Hans
Chon, Gayoung
Giacintucci, Simona
Clarke, Tracy E.
BORGANI, STEFANO 
David, Larry
Douspis, Marian
Pointecouteau, Etienne
Dahle, Håkon
Brown, Shea
Aghanim, Nabila
RASIA, ELENA 
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 843
Issue: 1
First Page: 76
Abstract: We derive and compare the fractions of cool-core clusters in the Planck Early Sunyaev-Zel’dovich sample of 164 clusters with z≤slant 0.35 and in a flux-limited X-ray sample of 100 clusters with z≤slant 0.30, using Chandra observations. We use four metrics to identify cool-core clusters: (1) the concentration parameter, which is the ratio of the integrated emissivity profile within 0.15 r <SUB>500</SUB> to that within r <SUB>500</SUB>; (2) the ratio of the integrated emissivity profile within 40 kpc to that within 400 kpc; (3) the cuspiness of the gas density profile, which is the negative of the logarithmic derivative of the gas density with respect to the radius, measured at 0.04 r <SUB>500</SUB>; and (4) the central gas density, measured at 0.01 r <SUB>500</SUB>. We find that the sample of X-ray-selected clusters, as characterized by each of these metrics, contains a significantly larger fraction of cool-core clusters compared to the sample of SZ-selected clusters (44% ± 7% versus 28% ± 4% using the concentration parameter in the 0.15-1.0 r <SUB>500</SUB> range, 61% ± 8% versus 36% ± 5% using the concentration parameter in the 40-400 kpc range, 64% ± 8% versus 38% ± 5% using the cuspiness, and 53% ± 7% versus 39 ± 5% using the central gas density). Qualitatively, cool-core clusters are more X-ray luminous at fixed mass. Hence, our X-ray, flux-limited sample, compared to the approximately mass-limited SZ sample, is overrepresented with cool-core clusters. We describe a simple quantitative model that uses the excess luminosity of cool-core clusters compared to non-cool-core clusters at fixed mass to successfully predict the observed fraction of cool-core clusters in X-ray-selected samples.
URI: http://hdl.handle.net/20.500.12386/26836
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aa7461
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aa7461
Bibcode ADS: 2017ApJ...843...76A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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