Constraint of Non-thermal X-ray Emission from the On-going Merger Cluster Abell 3376 with Suzaku

Abstract

Clusters of galaxies are among the best candidates for particle acceleration sources in the universe, a signature of which is non-thermal hard X-ray emission from the accelerated relativistic particles. We present early results on Suzaku observations of non-thermal emission from Abell 3376, which is a nearby on-going merger cluster. Suzaku observed the cluster twice, focusing on the cluster center containing the diffuse radio emission to the east, and cluster peripheral region to the west. For both observations, we detect no excess hard X-ray emission above the thermal cluster emission. An upper limit on the non-thermal X-ray flux of $2.1\times 10^{-11}$ erg cm${}^{-2}$ s${}^{-1}$ (15--50 keV) at the 3$\sigma$ level from a $34\times 34$ arcmin${}^2$ region, derived with the Hard X-ray Detector (HXD), is similar to that obtained with the BeppoSAX/PDS. Using the X-ray Imaging Spectrometer (XIS) data, the upper limit on the non-thermal emission from the West Relic is independently constrained to be $<1.1\times 10^{-12}$ erg s${}^{-1}$ cm${}^{-2}$ (4$-$8 keV) at the 3$\sigma$ level from a 122 arcmin${}^2$ region. Assuming Compton scattering between relativistic particles and the cosmic microwave background (CMB) photons, the intracluster magnetic field $B$ is limited to be $>0.03\mu$G (HXD) and $>0.10\mu$G (XIS).

19pages, 10 figures, accepted in the PASJ

References in corpus (6)

• Hard X-ray Detector (HXD) on Board Suzaku
• Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• In-Orbit Performance of the Hard X-ray Detector on board Suzaku
• Giant Ringlike Radio Structures Around Galaxy Cluster Abell 3376
• Hard X-Ray Properties of Groups of Galaxies as Observed with ASCA

Cited by in corpus (13)

• Systematic X-ray Analysis of Radio Relic Clusters with SUZAKU
• X-Ray View of the Shock Front in the Merging Cluster Abell 3376 with Suzaku
• GMRT observations of the Ophiuchus galaxy cluster
• X-ray study of the double radio relic Abell 3376 with Suzaku
• Suzaku Observation of the Radio Halo Cluster Abell 2319: Gas Dynamics and Hard X-ray Properties
• Cosmic Magnetism in Centimeter and Meter Wavelength Radio Astronomy
• Suzaku Observations of the Galaxy Cluster 1RXS J0603.3+4214: Implications of Particle Acceleration Processes in "Toothbrush" Radio Relic
• X-ray Spectroscopy of Clusters of Galaxies
• Investigating the hard X-ray emission from the hottest Abell cluster A2163 with Suzaku
• The Swift BAT Perspective on Non-thermal Emission in HIFLUGCS Galaxy Clusters
• Inverse-Compton Emission from Clusters of Galaxies: Predictions for ASTRO-H
• XMM-Newton view of the shock heating in an early merging cluster, CIZA J1358.9$-$4750
• Study of the Large-scale Temperature Structure of the Perseus Cluster with Suzaku