The origin of an extended X-ray emission apparently associated with the globular cluster 47 Tucanae

Abstract

Using the Suzaku X-ray Imaging Spectrometer, we performed a 130 ks observation of an extended X-ray emission, which was shown by ROSAT and Chandra observations to apparently associate with the globular cluster 47 Tucanae. The obtained $0.5-6$ keV spectrum was successfully fitted with a redshifted thin thermal plasma emission model whose temperature and redshift are $2.2_{-0.3}^{+0.2}$keV (at the rest frame) and $0.34\pm 0.02$, respectively. Derived parameters, including the temperature, redshift, and luminosity, indicate that the extended X-ray source is a background cluster of galaxies, and its projected location falls, by chance, on the direction of the proper motion of 47 Tucanae.

9 pages, 9 figures, accepted for publication in PASJ Vol. 61 No. 5

References in corpus (7)

• 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
• Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission
• Hard X-ray emission from the Galactic ridge
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Cited by in corpus (7)

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• Giant Lobes of Centaurus A Radio Galaxy Observed with the Suzaku X-ray Satellite
• Chandra detection of diffuse X-ray emission from the globular cluster Terzan 5
• Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B
• The X-ray Emissivity of Low-Density Stellar Populations
• Chandra detection of a new diffuse X-ray component from the globular cluster 47 Tucanae
• A deep Chandra study verifies diffuse non-thermal X-ray emission from the globular cluster Terzan 5