A NuSTAR observation of the center of the Coma Cluster
- IASF-Milano, INAF, Milan (Italy); Univ. of California, Irvine, CA (United States)
- NASA/Goddard Space Flight Center, Greenbelt, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
- IASF-Milano, INAF, Milan (Italy)
- Technical Univ. of Denmark, Lyngby (Denmark)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Columbia Univ., New York, NY (United States)
- NASA/Goddard Space Flight Center, Greenbelt, MD (United States)
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. In addition, 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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1313950
- Report Number(s):
- SLAC-PUB-16792; arXiv:1411.1573
- Journal Information:
- The Astrophysical Journal (Online), Vol. 800, Issue 2; ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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