The Fundamental Plane of Gamma-ray Globular Clusters

Details The Fundamental Plane of Gamma-ray Globular Clusters The Fundamental Plane of Gamma-ray Globular Clusters

2011-01-21

arxiv.org/abs/1101.4107v1

Astrophysical Journal, Volume 726, Page 100 (2011)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

17 pages, 4 figures, 3 tables, published in ApJ

Scientific paper

We have investigated the properties of a group of $\gamma$-ray emitting globular clusters (GCs) which have recently been uncovered in our Galaxy. By correlating the observed $\gamma$-ray luminosities $L_{\gamma}$ with various cluster properties, we probe the origin of the high energy photons from these GCs. We report $L_{\gamma}$ is positively correlated with the encounter rate $\Gamma_{c}$ and the metalicity $\left[{\rm Fe/H}\right]$ which place an intimate link between the gamma-ray emission and the millisecond pulsar population. We also find a tendency that $L_{\gamma}$ increase 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 $\Gamma_{c}$/$\left[{\rm Fe/H}\right]$ possibly span fundamental planes which potentially provide better predictions for the $\gamma$-ray properties of GCs.

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