THE FUNDAMENTAL PLANE OF GAMMA-RAY GLOBULAR CLUSTERS

被引：30
|
作者：
Hui, C. Y. [1 ]
Cheng, K. S. [2 ]
Wang, Y. [2 ]
Tam, P. H. T. [3 ,4 ]
Kong, A. K. H. [3 ,4 ]
Chernyshov, D. O. [5 ]
Dogiel, V. A. [6 ]
机构：
[1] Chungnam Natl Univ, Dept Astron & Space Sci, Taejon, South Korea
[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[3] Natl Tsing Hua Univ, Inst Astron, Hsinchu, Taiwan
[4] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
[5] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia
[6] PN Lebedev Phys Inst, IE Tamm Theoret Phys Div, Moscow 119991, Russia
来源：
ASTROPHYSICAL JOURNAL | 2011年 / 726卷 / 02期
关键词：
gamma rays: stars; globular clusters: general; pulsars: general; stars: neutron; X-RAY; MILLISECOND PULSARS; 47; TUCANAE; EMISSION; CONNECTION; BINARIES; DISCOVERY; GALAXIES; ORIGIN;
D O I：
10.1088/0004-637X/726/2/100
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have investigated the properties of a group of gamma-ray-emitting globular clusters (GCs) that have recently been uncovered in our Galaxy. By correlating the observed gamma-ray luminosity L-gamma with various cluster properties, we probe the origin of the high-energy photons from these GCs. We report that L-gamma is positively correlated with the encounter rate Gamma(c) and the metallicity [Fe/H], which places an intimate link between the gamma-ray emission and the millisecond-pulsar population. We also find a tendency that L-gamma increases with the energy densities of the soft photon at the cluster location. Furthermore, the two-dimensional regression analysis suggests that L-gamma, soft-photon densities, and Gamma(c)/[Fe/H] possibly span fundamental planes; this finding could potentially provide better predictions for the gamma-ray properties of GCs.
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页数：7
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