A NuSTAR observation of the center of the Coma Cluster
Nov 6, 2014
8 pages
Published in:
- Astrophys.J. 800 (2015) 2, 139
- Published: Feb 20, 2015
e-Print:
- 1411.1573 [astro-ph.HE]
Citations per year
Abstract: (IOP)
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.Note:
- 8 pages, 7 figures, accepted for publication in ApJ. Minor changes to match published version
- galaxies: clusters: general
- galaxies: clusters: individual
- X-rays: galaxies: clusters
References(53)
Figures(12)