期刊
ASTROPHYSICAL JOURNAL
卷 557, 期 2, 页码 L105-L108出版社
IOP PUBLISHING LTD
DOI: 10.1086/323248
关键词
globular clusters : individual (47 Tucanae); pulsars : general
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 parsecs of the cluster using two different methods that 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 interstellar medium in the vicinity of 47 Tucanae, and the ionized gas is probably the dominant component of the intracluster medium.
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