THE FUNDAMENTAL PLANE OF GAMMA-RAY GLOBULAR CLUSTERS

被引：32

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.

引用

页数：7

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