A Caltech Library Service

Imaging the Thermal and Kinematic Sunyaev–Zel’dovich Effect Signals in a Sample of 10 Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities

Sayers, Jack and Montaña, Alfredo and Mroczkowski, Tony and Wilson, Grant W. and Zemcov, Michael and Zitrin, Adi and Cibirka, Nathália and Golwala, Sunil and Hughes, David and Nagai, Daisuke and Reese, Erik D. and Sánchez, David and Zuhone, John (2019) Imaging the Thermal and Kinematic Sunyaev–Zel’dovich Effect Signals in a Sample of 10 Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities. Astrophysical Journal, 880 (1). Art. No. 45. ISSN 1538-4357. doi:10.3847/1538-4357/ab29ef.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We have imaged the Sunyaev–Zel'dovich (SZ) effect signals at 140 and 270 GHz toward 10 galaxy clusters with Bolocam and AzTEC/ASTE. We also used Planck data to constrain the signal at large angular scales, Herschel–SPIRE images to subtract the brightest galaxies that comprise the cosmic infrared background (CIB), Chandra imaging to map the electron temperature T_e of the intra-cluster medium, and Hubble Space Telescope imaging to derive models of each galaxy cluster's mass density. The galaxy clusters gravitationally lens the background CIB, which produced an on-average reduction in brightness toward the galaxy clusters' centers after the brightest galaxies were subtracted. We corrected for this deficit, which was between 5% and 25% of the 270 GHz SZ effect signal within R_(2500). Using the SZ effect measurements, along with the X-ray constraint on T_e , we measured each galaxy cluster's average line of sight (LOS) velocity v_z within R_(2500), with a median per-cluster uncertainty of ±700 km s^(−1). We found an ensemble-mean〈v_z 〉of 430 ± 210 km s^(−1), and an intrinsic cluster-to-cluster scatter σ_(int) of 470 ± 340 km s−1. We also obtained maps of v_z over each galaxy cluster's face with an angular resolution of 70''. All four galaxy clusters previously identified as having a merger oriented along the LOS showed an excess variance in these maps at a significance of ≃2–4σ, indicating an internal v_z rms of ≳1000 km s^(−1). None of the six galaxy clusters previously identified as relaxed or plane-of-sky mergers showed any such excess variance.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Sayers, Jack0000-0002-8213-3784
Montaña, Alfredo0000-0003-4229-381X
Mroczkowski, Tony0000-0003-3816-5372
Wilson, Grant W.0000-0003-2705-9152
Zemcov, Michael0000-0001-8253-1451
Zitrin, Adi0000-0002-0350-4488
Cibirka, Nathália0000-0002-2356-4680
Golwala, Sunil0000-0002-1098-7174
Nagai, Daisuke0000-0002-6766-5942
Reese, Erik D.0000-0002-8700-7082
Sánchez, David0000-0002-7344-9920
Zuhone, John0000-0003-3175-2347
Alternate Title:Imaging the Thermal and Kinematic Sunyaev-Zel'dovich Effect Signals in a Sample of Ten Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities
Additional Information:© 2019 The American Astronomical Society. Received 2018 December 14; revised 2019 June 5; accepted 2019 June 12; published 2019 July 24. S.G., E.R., J.S., and G.W. were supported by NASA/NNX15AV66G. This work was partially supported by Consejo Nacional de Ciencia y Technología (CONACYT) project FDC-2016-1848. The scientific results reported in this article are based in part on data obtained from the Chandra Data Archive. This research has made use of software provided by the Chandra X-ray Center (CXC) in the application packages CIAO, ChiPS, and Sherpa. We thank Georgiana Ogrean for providing her X-ray reprocessing and analysis scripts. We thank the referee for providing several useful suggestions that have improved this manuscript.
Group:Astronomy Department
Funding AgencyGrant Number
Consejo Nacional de Ciencia y Tecnología (CONACYT)FDC-2016-1848
Subject Keywords:galaxies: clusters: intracluster medium – cosmology: observations
Issue or Number:1
Record Number:CaltechAUTHORS:20190724-092522268
Persistent URL:
Official Citation:Jack Sayers et al 2019 ApJ 880 45
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97385
Deposited By: Tony Diaz
Deposited On:24 Jul 2019 16:34
Last Modified:16 Nov 2021 17:31

Repository Staff Only: item control page