Gamma-ray emission from globular clusters 2MS-GC01, IC 1257, FSR 1735, NGC 5904 and 6656
Jan 26, 20156 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 448 (2015) 4, 3215-3220
- Published: Apr 21, 2015
e-Print:
- 1501.06341 [astro-ph.HE]
DOI:
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Abstract: (Oxford University Press)
Globular clusters (GCs) are the oldest stellar systems in the Galaxy, in which millisecond pulsars are widely believed to be the only steady γ-ray emitters. So far, nine γ-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 γ-ray emission from 2MS-GC01 and IC 1257 and report the discovery of γ-ray emission from NGC 5904 and 6656 within their tidal radii. Also, strong evidence of significant γ-ray emission is found from FSR 1735. From the observed γ-ray luminosities, we estimate the numbers of millisecond pulsars that are expected to be present in these GCs.Note:
- 7 pages, 3 figures, accepted for publication in MNRAS
- gamma-rays: general
- globular clusters: individual: NGC 5904
- globular clusters: individual: NGC 6656
- globular clusters: individual: FSR 1735
- globular clusters: individual: 2MS-GC01
- globular clusters: individual: IC 1257
References(17)
Figures(10)