Radio Images of the Globular Cluster 47 Tucanae

D. McConnell ,
R. Deacon ,
J.G. Ables
, PASA, 18 (2), in press.

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Introduction

Previously we imaged the globular cluster 47 Tucanae with the Australia Telescope Compact Array (ATCA) at 1.4 and 1.7 GHz (McConnell and Ables, 2000 -- MA2000) with the aim of identifying radio sources corresponding to the pulsars known to exist in the cluster. We were able to report the detection of pulsars 47 Tuc C and D and identified several compact sources which had spectral indices and time variability characteristic of pulsars. One of these was later identified with pulsar 47 Tuc J. (See also Fruchter and Goss, 2000.) Here we describe more sensitive images of the cluster derived from $\sim$170 hours of integration. 47 Tuc is known to contain at least 22 millisecond pulsars (Manchester, 2000). Many of the pulsars show period variations characteristic of motion in binary orbits. This, and the pulsars' intermittent detectability, have made difficult the use of pulse timing analyses to determine pulsar positions. Pulse timing has so far yielded positions for only 15 of the 22 pulsars (Manchester, 2000; Freire et al., 2000).
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