On searches for pulsed emission with application to four globular cluster X-ray sources : NGC 1851, 6441, 6624 and 6712.
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:
- Bibcode:
- 1983ApJ...266..160L
- Keywords:
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- 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