Possible non-thermal origin of the hard X-ray emission in the merging galaxy cluster SPT-CL J2031-4037

被引：3
作者：
Mirakhor, M. S. [1 ]
Walker, S. A. [1 ]
Runge, J. [1 ]
Diwanji, P. [1 ]
机构：
[1] Univ Alabama, Dept Phys & Astron, 301 Sparkman Dr, Huntsville, AL 35899 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 516卷 / 02期
关键词：
galaxies: clusters: general; galaxies: clusters: individual: SPT-CL J2031-4037; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters; TIMING-EXPLORER OBSERVATIONS; SOUTH-POLE TELESCOPE; COMA CLUSTER; BEPPOSAX VIEW; SAMPLE; EVOLUTION; SPECTRUM; CORES;
D O I：
10.1093/mnras/stac2379
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页码：1855 / 1864
页数：10
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