Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 516, Issue 2, Pages 1855-1864Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac2379
Keywords
galaxies: clusters: general; galaxies: clusters: individual: SPT-CL J2031-4037; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
Categories
Funding
- NASA NuSTAR grant [80NSSC21K0074]
- NASA
Ask authors/readers for more resources
In this study, the high-energy X-ray emission of the merging galaxy cluster SPT-CL J2031-4037 is analyzed using NuSTAR observations. The results suggest the presence of a non-thermal component in the hard X-ray emission, and estimate the volume-averaged magnetic field strength of the cluster.
Non-thermal emission from clusters of galaxies at the high-energy X-ray regime has been searched with various instruments, but the detection significance of this emission has yet been found to be either marginal or controversial. Taking advantage of NuSTAR's unique capability to focus X-rays in the hard energy band, we present a detailed analysis of 238 ks NuSTAR observations of the merging galaxy cluster SPT-CL J2031-4037, searching for non-thermal inverse Compton emission. Our spectral analysis of SPT-CL J2031-4037 shows a possibility that the hard X-ray emission of the cluster can be described by a non-thermal component, though we cannot completely rule out a purely thermal origin for this hard emission. Including the statistical and systematic uncertainties, our best model fit yields a 20-80 keV non-thermal flux of 3.93(-1.10)(+1.24)10(-12) erg s(-1 )cm(-2). The estimated non-thermal flux is comparable to those found in other galaxy clusters using NuSTAR and other X-ray instruments. Using this non-thermal flux with the existing radio data of the cluster, we estimate a volume-averaged magnetic field strength in the range of around 0.1-0.2 mu G.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available