Chandra detection of a new diffuse X-ray component from the globular cluster 47 Tucanae

Abstract

In re-analyzing the archival Chandra data of the globular cluster 47 Tucanae, we have detected a new diffuse X-ray emission feature within the half-mass radius of the cluster. The spectrum of the diffuse emission can be described by a power-law model plus a plasma component with photon index $\Gamma \sim 1.0$ and plasma temperature $kT\sim 0.2$ keV. While the thermal component is apparently uniform, the non-thermal contribution falls off exponentially from the core. The observed properties could possibly be explained in the context of multiple shocks resulted from the collisions among the stellar wind in the cluster and the inverse Compton scattering between the pulsar wind and the relic photons.

arXiv comment14 pages, 3 figures, 2 tables, Accepted for publication in ApJ Letter

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• Identifying the brightest Galactic globular clusters for future observations by H.E.S.S. and CTA
• Probing the pulsar population of Terzan 5 via spectral modeling
• Characterizing the Gamma-ray Emission Properties of the Globular Cluster M5 with the Fermi-LAT
• A deep Chandra study verifies diffuse non-thermal X-ray emission from the globular cluster Terzan 5