Publication Date:
2015-03-12
Description:
Globular clusters (GCs) are the oldest stellar systems in the Galaxy, in which millisecond pulsars are widely believed to be the only steady -ray emitters. So far, nine -ray GCs have been identified and a few candidates, such as 2MS-GC01 and IC 1257, have been suggested. In this work, after analysing the publicly available Fermi Large Area Telescope data, we confirm the significant -ray emission from 2MS-GC01 and IC 1257 and report the discovery of -ray emission from NGC 5904 and 6656 within their tidal radii. Also, strong evidence of significant -ray emission is found from FSR 1735. From the observed -ray luminosities, we estimate the numbers of millisecond pulsars that are expected to be present in these GCs.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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