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On searches for pulsed emission with application to four globular cluster X-ray sources - NGC 1851, 6441, 6624, and 6712
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1983
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Globular cluster X‑ray sources are investigated for periodic pulsations that could indicate neutron stars or pulsars. The study aimed to detect periodic pulsations in the X‑ray emission of NGC 1851, 6441, 6624, and 6712 using the Einstein Observatory’s Monitor Proportional Counter. The analysis employed the Monitor Proportional Counter data and incorporated corrections for effects routinely overlooked in previous studies. No pulsed emission was detected over periods from 1 ms to ~500 s, and 90 % confidence upper limits on the pulsed fraction were established. Published in The Astrophysical Journal (1983) DOI 10.1086/160766.
view Abstract Citations (643) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On searches for pulsed emission with application to four globular cluster X-ray sources : NGC 1851, 6441, 6624 and 6712. Leahy, D. A. ; Darbro, W. ; Elsner, R. F. ; Weisskopf, M. C. ; Sutherland, P. G. ; Kahn, S. ; Grindlay, J. E. 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. Publication: The Astrophysical Journal Pub Date: March 1983 DOI: 10.1086/160766 Bibcode: 1983ApJ...266..160L Keywords: Globular Clusters; Pulsars; Stellar Radiation; X Ray Sources; Binary Stars; Computerized Simulation; Confidence Limits; Fast Fourier Transformations; Heao 2; Monte Carlo Method; Proportional Counters; Astrophysics full text sources ADS | data products SIMBAD (6)