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A NuSTAR Observation of the Center of the Coma Cluster

Gastaldello, Fabio and Wik, Daniel R. and Molendi, S. and Westergaard, N. J. and Hornstrup, A. and Madejski, G. and Ferreira, D. D. M. and Boggs, S. E. and Christensen, F. E. and Craig, W. W. and Grefenstette, B. W. and Hailey, C. J. and Harrison, F. A. and Madsen, K. K. and Stern, D. and Zhang, W. W. (2015) A NuSTAR Observation of the Center of the Coma Cluster. Astrophysical Journal, 800 (2). Art. No. 139. ISSN 0004-637X. doi:10.1088/0004-637X/800/2/139.

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We present the results of a 55 ks NuSTAR observation of the core of the Coma Cluster. The global spectrum can be explained by thermal gas emission, with a conservative 90% upper limit to non-thermal inverse Compton (IC) emission of 5.1 × 10^(–12) erg cm^(–2) s^(–1) in a 12' × 12' field of view. The brightness of the thermal component in this central region does not allow more stringent upper limits on the IC component when compared with non-imaging instruments with much larger fields of view where claims of detections have been made. Future mosaic NuSTAR observations of Coma will further address this issue. The temperature map shows a relatively uniform temperature distribution with a gradient from the hot northwest side to the cooler southeast, in agreement with previous measurements. The temperature determination is robust given the flat effective area and low background in the 3-20 keV band, making NuSTAR an ideal instrument to measure high temperatures in the intracluster medium.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wik, Daniel R.0000-0001-8952-676X
Boggs, S. E.0000-0001-9567-4224
Christensen, F. E.0000-0001-5679-1946
Grefenstette, B. W.0000-0002-1984-2932
Harrison, F. A.0000-0003-2992-8024
Madsen, K. K.0000-0003-1252-4891
Stern, D.0000-0003-2686-9241
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2015 American Astronomical Society. Received 2014 November 4; accepted 2014 December 28; published 2015 February 20. This research made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by NASA. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). Facility: NuSTAR
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:galaxies: clusters: general; galaxies: clusters: individual (Coma); X-rays: galaxies: clusters
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-77
Issue or Number:2
Record Number:CaltechAUTHORS:20150324-113734112
Persistent URL:
Official Citation:A NuSTAR Observation of the Center of the Coma Cluster Fabio Gastaldello et al. 2015 ApJ 800 139
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56027
Deposited By: Ruth Sustaita
Deposited On:24 Mar 2015 18:59
Last Modified:10 Nov 2021 20:53

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