THE FUNDAMENTAL PLANE OF GAMMA-RAY GLOBULAR CLUSTERS
- Department of Astronomy and Space Science, Chungnam National University, Daejeon (Korea, Republic of)
- Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)
- Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)
- Moscow Institute of Physics and Technology, Institutskii Lane, 141700 Moscow Region, Dolgoprudnii (Russian Federation)
- I. E. Tamm Theoretical Physics Division of P. N. Lebedev Institute, Leninskii pr 53, 119991 Moscow (Russian Federation)
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{sub {gamma}} with various cluster properties, we probe the origin of the high-energy photons from these GCs. We report that L{sub {gamma}} is positively correlated with the encounter rate {Gamma}{sub 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{sub {gamma}} increases with the energy densities of the soft photon at the cluster location. Furthermore, the two-dimensional regression analysis suggests that L{sub {gamma}}, soft-photon densities, and {Gamma}{sub c} /[Fe/H] possibly span fundamental planes; this finding could potentially provide better predictions for the {gamma}-ray properties of GCs.
- OSTI ID:
- 21567647
- Journal Information:
- Astrophysical Journal, Vol. 726, Issue 2; Other Information: DOI: 10.1088/0004-637X/726/2/100; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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