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Thermodynamic profiles of galaxy clusters from a joint X-ray/SZ analysis

Shitanishi, Jennifer A. and Pierpaoli, Elena and Sayers, Jack and Golwala, Sunil R. and Ameglio, Silvia and Mantz, Adam B. and Mroczkowski, Tony K. and Rasia, Elena and Siegel, Seth (2018) Thermodynamic profiles of galaxy clusters from a joint X-ray/SZ analysis. Monthly Notices of the Royal Astronomical Society, 481 (1). pp. 749-792. ISSN 0035-8711. doi:10.1093/mnras/sty2195.

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We jointly analyse the Bolocam Sunyaev–Zel’dovich (SZ) effect and Chandra X-ray data for a set of 45 clusters to derive gas density and temperature profiles without using spectroscopic information. The sample spans the mass and redshift range 3×10^(14) M_⊙ ≤ M_(500) ≤ 25×10^(14) M_⊙ and 0.15 ≤ z ≤ 0.89. We define cool-core and non-cool core subsamples based on the central X-ray luminosity, and 17 out of 45 clusters are classified as cool core. In general, the profiles derived from our analysis are found to be in good agreement with previous analyses, and profile constraints beyond r_(500) are obtained for 34 out of 45 clusters. In approximately 30 per cent of the cool-core clusters, our analysis shows a central temperature drop with a statistical significance of >3σ; this modest detection fraction is due mainly to a combination of coarse angular resolution and modest signal-to-noise ratio in the SZ data. Most clusters are consistent with an isothermal profile at the largest radii near r_(500), although 10 out of 45 show a significant temperature decrease with increasing radius. The sample mean density profile is in good agreement with previous studies, and shows a minimum intrinsic scatter of approximately 10 per cent near 0.5r_(500). The sample mean temperature profile is consistent with isothermal, and has an intrinsic scatter of approximately 50 per cent  independent of radius. This scatter is significantly higher compared to earlier X-ray-only studies, which find intrinsic scatters near 10 per cent , likely due to a combination of unaccounted-for non-idealities in the SZ noise, projection effects, and sample selection.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Pierpaoli, Elena0000-0002-7957-8993
Sayers, Jack0000-0002-8213-3784
Golwala, Sunil R.0000-0002-1098-7174
Mantz, Adam B.0000-0002-8031-1217
Mroczkowski, Tony K.0000-0003-3816-5372
Rasia, Elena0000-0003-4175-002X
Siegel, Seth0000-0003-2631-6217
Additional Information:© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2018 August 9. Received 2018 August 8; in original form 2017 December 14. Computation for the work described in this paper was supported by the University of Southern California’s Center for High-Performance Computing ( JAS would like to thank the Women in Science and Engineering (WiSE) Program at USC for financial support. Silvia Ameglio was supported by the USC WiSE postdoctoral fellowship and the NSF ADVANCE AST-0649899. EP wishes to thank the Aspen Center for Physics for hospitality during part of the preparation of this work. JS was partially supported by NSF/AST-1617022.
Group:Astronomy Department
Funding AgencyGrant Number
Women in Science and Engineering (WISE)UNSPECIFIED
University of Southern CaliforniaUNSPECIFIED
Subject Keywords:galaxies: clusters: intracluster medium, X-rays: galaxies: clusters
Issue or Number:1
Record Number:CaltechAUTHORS:20181129-112744239
Persistent URL:
Official Citation:Jennifer A Shitanishi, Elena Pierpaoli, Jack Sayers, Sunil R Golwala, Silvia Ameglio, Adam B Mantz, Tony K Mroczkowski, Elena Rasia, Seth Siegel; Thermodynamic profiles of galaxy clusters from a joint X-ray/SZ analysis, Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 1, 21 November 2018, Pages 749–792,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91332
Deposited By: George Porter
Deposited On:29 Nov 2018 20:37
Last Modified:16 Nov 2021 03:40

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