Search for pulsed gamma-ray emission from globular cluster M28

(2) Chungnam National University; (3) University of Hong Kong); A. K. H. Kong (1); C. Y. Hui (2); E. M. H. Wu (3); J. H. K. Wu (1); J. Takata (3); K. S. Cheng (3) ((1) National Tsing Hua University; P. H. T. Tam (1); R. H. H. Huang (1)

Search for pulsed gamma-ray emission from globular cluster M28

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arxiv 1302.0610 v1 pith:EO7PU5O5 submitted 2013-02-04 astro-ph.HE

Search for pulsed gamma-ray emission from globular cluster M28

J. H. K. Wu (1) , C. Y. Hui (2) , E. M. H. Wu (3) , A. K. H. Kong (1) , R. H. H. Huang (1) , P. H. T. Tam (1) , J. Takata (3) , K. S. Cheng (3) ((1) National Tsing Hua University

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(2) Chungnam National University (3) University of Hong Kong)

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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.

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