Active gas features in three HSC-SSP CAMIRA clusters revealed by high angular resolution analysis of MUSTANG-2 SZE and XXL X-ray observations

Nobuhiro Okabe*, Simon Dicker, Dominique Eckert, Tony Mroczkowski, Fabio Gastaldello, Yen-Ting Lin, Mark Devlin, Charles E. Romero, Mark Birkinshaw, Craig Sarazin, Cathy Horellou, Tetsu Kitayama, Keiichi Umetsu, Mauro Sereno, Brian S. Mason, John A. ZuHone, Ayaka Honda, Hiroki Akamatsu, I-Non Chiu, Kotaro KohnoKai-Yang Lin, Elinor Medezinski, Satoshi Miyazaki, Ikuyuki Mitsuishi, Atsushi J. Nishizawa, Masamune Oguri, Naomi Ota, Florian Pacaud, Marguerite Pierre, Jonathan Sievers, Vernesa Smolcic, Sara Stanchfield, Keigo Tanaka, Ryoichi Yamamoto, Chong Yang, Atsushi Yoshida

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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We present results from simultaneous modeling of high angular resolution GBT/MUSTANG-2 90 GHz Sunyaev-Zel'dovich effect (SZE) measurements and XMM-XXL X-ray images of three rich galaxy clusters selected from the HSC-SSP Survey. The combination of high angular resolution SZE and X-ray imaging enables a spatially resolved multi-component analysis, which is crucial to understand complex distributions of cluster gas properties. The targeted clusters have similar optical richnesses and redshifts, but exhibit different dynamical states in their member galaxy distributions; a single-peaked cluster, a double-peaked cluster, and a cluster belonging to a supercluster. A large-scale residual pattern in both regular Compton-parameter $y$ and X-ray surface brightness distributions is found in the single-peaked cluster, indicating a sloshing mode. The double-peaked cluster shows an X-ray remnant cool core between two SZE peaks associated with galaxy concentrations. The temperatures of the two peaks reach $\sim20-30$ keV in contrast to the cool core component of $\sim2$ keV, indicating a violent merger. The highest SZE signal for the supercluster is elongated along a direction perpendicular to the major axis of the X-ray core, suggesting a minor merger before core passage. The $S_X$ and $y$ distributions are thus perturbed at some level, regardless of the optical properties. We find that an integrated Compton $y$ parameter and a temperature for the major merger are significantly boosted from those expected by the weak-lensing mass and those for the other two clusters show no significant deviations, which is consistent with predictions of numerical simulations.
Original languageEnglish
Article numberstaa2330
Pages (from-to)1701–1732
Number of pages32
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date9 Sept 2020
Publication statusPublished - 1 Feb 2021

Bibliographical note

Funding Information:
This work was in part supported by the Funds for the Development of Human Resources in Science and Technology under MEXT, Japan and Core Research for Energetic Universe in Hiroshima University and in-house grant for international conferences under the MEXT's Program for Promoting the Enhancement of Research Universities, Japan. This paper is supported in part by JSPS KAKENHI grant number JP20K04012 (N.O.), JP18K03704 (T.K.), JP15H05892 (M.O.), and JP18K03693 (M.O.). SRON is supported financially by NWO, the Netherlands Organization for Scientific Research.MS acknowledges financial contribution from contract ASI-INAF n.2017-14-H.0 and INAF 'Call per interventi aggiuntivi a sostegno della ricerca di main stream di INAF'. KU acknowledges support from the Ministry of Science and Technology of Taiwan (grant no. MOST 106-2628-M- 001-003-MY3) and from the Academia Sinica Investigator Award (grant no. AS-IA-107-M01).

Publisher Copyright:
© 2020 The Author(s).


  • galaxies: clusters: general
  • galaxies: clusters: intracluster medium
  • X-rays: galaxies: clusters
  • gravitational lensing: weak
  • dio continuum: galaxies


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