GAMMA-RAY EMISSION FROM THE GLOBULAR CLUSTERS LILLER 1, M80, NGC 6139, NGC 6541, NGC 6624, AND NGC 6752

被引:56
作者
Tam, P. H. T. [1 ,2 ]
Kong, A. K. H. [1 ,2 ]
Hui, C. Y. [3 ]
Cheng, K. S. [4 ]
Li, C. [4 ]
Lu, T. -N. [1 ,2 ]
机构
[1] Natl Tsing Hua Univ, Inst Astron, Hsinchu, Taiwan
[2] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
[3] Chungnam Natl Univ, Dept Astron & Space Sci, Taejon, South Korea
[4] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
关键词
gamma rays: stars; globular clusters: individual (Liller 1; M80; NGC; 6139; 6441; 6541; NGC 6624 and NGC 6752); pulsars: general; LARGE-AREA TELESCOPE; MILLISECOND PULSARS; X-RAY; DYNAMICAL FORMATION; 47; TUCANAE; POPULATION; DISCOVERY; PHOTOMETRY; DIAGRAMS; CATALOG;
D O I
10.1088/0004-637X/729/2/90
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Globular clusters (GCs) are emerging as a new class of gamma-ray emitters, thanks to the data obtained from the Fermi Gamma-ray Space Telescope. By now, eight GCs are known to emit gamma-rays at energies > 100MeV. Based on the stellar encounter rate of the GCs, we identify potential gamma-ray emitting GCs out of all known GCs that have not been studied in detail before. In this paper, we report the discovery of a number of new gamma-ray GCs: Liller 1, NGC 6624, and NGC 6752, and evidence of gamma-ray emission from M80, NGC 6139, and NGC 6541, in which gamma-rays were found within the GC tidal radius. With one of the highest metallicities among all GCs in the Milky Way, the gamma-ray luminosity of Liller 1 is found to be the highest of all known gamma-ray GCs. In addition, we confirm a previous report of a significant gamma-ray emitting region next to NGC 6441. We briefly discuss the observed offset of gamma-rays from some GC cores. The increasing number of known gamma-ray GCs at distances out to similar to 10 kpc is important for us to understand the gamma-ray emitting mechanism and provides an alternative probe to the underlying millisecond pulsar populations of the GCs.
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