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Title: A NuSTAR observation of the center of the Coma Cluster

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. 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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [4];  [6];  [4];  [7];  [8];  [9];  [8];  [8];  [8];  [10]
  1. IASF-Milano, INAF, Milan (Italy); Univ. of California, Irvine, CA (United States)
  2. NASA/Goddard Space Flight Center, Greenbelt, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  3. IASF-Milano, INAF, Milan (Italy)
  4. Technical Univ. of Denmark, Lyngby (Denmark)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Univ. of California, Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  9. Columbia Univ., New York, NY (United States)
  10. NASA/Goddard Space Flight Center, Greenbelt, MD (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1313950
Report Number(s):
SLAC-PUB-16792
Journal ID: ISSN 1538-4357; arXiv:1411.1573
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 800; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astrophysics; ASTRO; GRQC; galaxies: clusters: general; galaxies: clusters: individual (Coma); X-rays: galaxies

Citation Formats

Gastaldello, Fabio, Wik, Daniel R., Molendi, S., 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., and Zhang, W. W. A NuSTAR observation of the center of the Coma Cluster. United States: N. p., 2015. Web. doi:10.1088/0004-637X/800/2/139.
Gastaldello, Fabio, Wik, Daniel R., Molendi, S., 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. A NuSTAR observation of the center of the Coma Cluster. United States. doi:10.1088/0004-637X/800/2/139.
Gastaldello, Fabio, Wik, Daniel R., Molendi, S., 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., and Zhang, W. W. Fri . "A NuSTAR observation of the center of the Coma Cluster". United States. doi:10.1088/0004-637X/800/2/139. https://www.osti.gov/servlets/purl/1313950.
@article{osti_1313950,
title = {A NuSTAR observation of the center of the Coma Cluster},
author = {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.},
abstractNote = {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.},
doi = {10.1088/0004-637X/800/2/139},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 800,
place = {United States},
year = {2015},
month = {2}
}

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