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Title: CHANDRA DETECTION OF A NEW DIFFUSE X-RAY COMPONENT FROM THE GLOBULAR CLUSTER 47 TUCANAE

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 Γ ∼ 1.0 and plasma temperature kT ∼ 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 resulting from the collisions among the stellar wind in the cluster and the inverse Compton scattering between the pulsar wind and the relic photons.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)
  2. Department of Astronomy and Space Science, Chungnam National University, Daejeon (Korea, Republic of)
  3. Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)
  4. I. E. Tamm Theoretical Physics Division of P. N. Lebedev Institute of Physics, Leninskii pr. 53, 119991 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22365765
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 788; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPTON EFFECT; COSMIC PHOTONS; DETECTION; ELECTRON TEMPERATURE; INDEXES; ION TEMPERATURE; KEV RANGE; PULSARS; STAR CLUSTERS; STARS; STELLAR WINDS; X RADIATION