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Search for pulsed gamma-ray emission from globular cluster M28

Using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, we have searched for the gamma-ray pulsations from the direction of globular cluster M28 (NGC 6626). We report the discovery of a signal with the frequency consistent with that of the energetic millisecond pulsar (MSP) PSR B1821-24 in M28. A weighted H-test test statisic (TS) of 28.8 is attained which corresponds to a chance probability of ~1e-5 (4.3-sigma detection). With a phase-resolved analysis, the pulsed component is found to contribute ~25% of the total observed gamma-ray emission from the cluster. On the other hand, the unpulsed level provides a constraint for the underlying MSP population and the fundamental plane relations for the scenario of inverse Compton scattering. Follow-up timing observations in radio/X-ray are encouraged for further investigating this periodic signal candidate.

preprint2013arXivOpen access
J. H. K. WuC. Y. HuiE. M. H. WuA. K. H. KongR. H. H. HuangP. H. T. TamJ. TakataK. S. Cheng
astro-ph.HE
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Open access8 authors1 topic
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J. H. K. WuC. Y. HuiE. M. H. WuA. K. H. KongR. H. H. HuangP. H. T. TamJ. TakataK. S. Cheng

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