Globular clusters (GCs) are the oldest stellar system in the Galaxy, in which the millisecond pulsars are widely believed to be the only steady {\gamma}-ray emitters. So far 9 {\gamma}-ray GCs have been identified and a few candidates such as 2MS-GC01 and IC 1257 have been suggested. In this work, after analyzing the publicly-available Fermi-LAT data we confirm the significant {\gamma}-ray emission from 2MS-GC01 and IC 1257 and report the discovery for {\gamma}-ray emission from NGC 5904 and NGC 6656 within their tidal radii. Also a strong evidence of significant {\gamma}-ray emission is found from FSR 1735. From the observed {\gamma}-ray luminosities, the numbers of MSPs that are expected to be present in these GCs are estimated.
D. Pooley, W. H. G. Lewin, Scott F. Anderson, Holger Baumgardt, Alexei V Filippenko, B. M. Gaensler, Lee Homer, Piet Hut, V. M. Kaspi, Junichiro Makino, B. Margon, Steve McMillan, Simon Portegies Zwart, M. van der Klis, F. Verbunt
Ziteng Wang, Nanda Rea, Tong Bao, David Kaplan, E. Lenc, Zorawar Wadiasingh, Jeremy Hare, Andrew Zic, Akash Anumarlapudi, Apurba Bera, Paz Beniamini, A. J. Cooper, T. E. Clarke, Adam T. Deller, J. R. Dawson, Marcin Glowacki, N. Hurley‐Walker, S. J. McSweeney, Emil Polisensky, Wendy Peters, George Younes, K. W. Bannister, Manisha Caleb, Kristen C. Dage, C. James,
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