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

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

2009-06-19

arxiv.org/abs/0906.3583v1

Publ. Astron. Soc. Japan 61, pp.1107--1115 (2009)

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

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

Scientific paper

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 $0.34\pm0.02$, 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.

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