Gamma-ray emission from globular clusters 2MS-GC01, IC 1257, NGC5904, NGC6656 and FSR1735

Authors :: Zhou, J. N.
Zhang, P. F.
Huang, X. Y.
Li, X.
Liang, Y. F.
Fu, L.
Yan, J. Z.
Liu, Q. Z.
Publication Year :: 2015
Abstract: 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.<br />Comment: 7 pages, 3 figures, accepted for publication in MNRAS

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