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A NuSTAR Observation of the Center of the Coma Cluster

Journal
Date Issued
2015
Author(s)
•
Wik, Daniel R.
•
•
Westergaard, N. J.
•
Hornstrup, A.
•
Madejski, G.
•
Ferreira, D. D. M.
•
Boggs, S. E.
•
Christensen, F. E.
•
Craig, W. W.
•
Grefenstette, B. W.
•
Hailey, C. J.
•
Harrison, F. A.
•
Madsen, K. K.
•
Stern, D.
•
Zhang, W. W.
DOI
Description
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
Abstract
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.
Volume
800
Issue
2
Start page
139
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2015ApJ...800..139G
Rights
open.access
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