Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 765, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/765/2/L47
Keywords
gamma rays: stars; globular clusters: individual (M28, NGC 6626); pulsars: individual (PSR B1821-24, PSR J1824-2452A)
Categories
Funding
- National Science Council of the Republic of China (Taiwan) [NSC100-2628-M-007-002-MY3, NSC100-2923-M-007-001-MY3]
- National Research Foundation of Korea [2011-0023383]
- Kenda Foundation
- HK Government [HKU700911P]
- National Research Foundation of Korea [2011-0023383] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
Using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, we have searched for gamma-ray pulsations from the direction of the globular cluster M28 (NGC 6626). We report the discovery of a signal with a frequency consistent with that of the energetic millisecond pulsar (MSP) PSR B1821-24 in M28. A weighted H-test test statistic of 28.8 is attained, which corresponds to a chance probability of similar to 10(-5) (4.3 sigma detection). With a phase-resolved analysis, the pulsed component is found to contribute similar to 25% of the total observed gamma-ray emission from the cluster. However, 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 to further investigate this periodic signal candidate.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available
Share Paper
