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On searches for pulsed emission with application to four globular cluster X-ray sources - NGC 1851, 6441, 6624, and 6712
The Astrophysical Journal1983Vol. 266, pp. 160–160
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D. A. Leahy, W. Darbro, Ronald F. Elsner, M. C. Weisskopf, S. M. Kahn, P. G. Sutherland, J. E. Grindlay
Abstract
Periodic pulsations have been sought in the NGC 1851, 6441, 6624, and 6712 globular cluster sources' X-ray emission, using the Einstein Observatory's Monitor Proportional Counter. Special attention is given to features of the present methods of analysis, which correctly account for several effects that have been routinely overlooked by other researchers. No pulsed emission was detected in the periods searched, which covered from 1 msec to about 500 sec. The 90% confidence upper limits for the pulsed fraction are given.
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