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Detection of ionized gas in the globular cluster 47 Tucanae

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arxiv astro-ph/0107206 v1 pith:FQOBU3WI submitted 2001-07-11 astro-ph

Detection of ionized gas in the globular cluster 47 Tucanae

P. C. Freire (1) , M. Kramer (1) , A. G. Lyne (1) , F. Camilo (2) , R. N. Manchester (3) , N. D'Amico (4) ((1) Jodrell Bank , (2) Columbia , (3) ATNF
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(4) Bologna)
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keywords clusterionizedtucanaedensityderivativedetectionelectronglobular
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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.

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Cited by 3 Pith papers

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