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Article overview
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Detection of ionized gas in the globular cluster 47 Tucanae | P. C. Freire
; M. Kramer
; A. G. Lyne
; F. Camilo
; R. N. Manchester
; N. D’Amico
; | Date: |
11 Jul 2001 | Subject: | astro-ph | Affiliation: | Jodrell Bank, Columbia, ATNF, Bologna | Abstract: | We report the detection of ionized intracluster gas in the globular cluster 47 Tucanae. Pulsars in this cluster with a negative period derivative, which must lie in the distant half of the cluster, have significantly higher measured integrated electron column densities than the pulsars with a positive period derivative. We derive the plasma density within the central few pc of the cluster using two different methods which yield consistent values. Our best estimate of n_e = (0.067+-0.015)/cm^3 is about 100 times the free electron density of the ISM in the vicinity of 47 Tucanae, and the ionized gas is probably the dominant component of the intracluster medium. | Source: | arXiv, astro-ph/0107206 | Services: | Forum | Review | PDF | Favorites |
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