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+0.2-0.3 keV (at the rest frame) and 0.34±0.02, respectively. The 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.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- October 2009
- DOI:
- 10.1093/pasj/61.5.1107
- arXiv:
- arXiv:0906.3583
- Bibcode:
- 2009PASJ...61.1107Y
- Keywords:
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- Galaxy: globular clusters: individual (47 Tucanae);
- X-rays: ISM;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 9 pages, 9 figures, accepted for publication in PASJ Vol. 61 No. 5