Misaligned TeV gamma-ray sources in the vicinity of globular clusters

Abstract

Globular clusters (GCs) contain huge number of low mass stars and also large number of millisecond pulsars (MSPs). Due to the number of stars, the stellar and MSP winds mix efficiently within the GC. Such mixture of winds leaves GC and interacts with the galactic medium creating a bow shock nebula around GC. The bow shock nebula is filled with relativistic leptons accelerated in the pulsar magnetospheres and/or wind regions. We argue that nebulae around globular clusters, immersed in relatively dense medium close to the galactic plane, should have complicated morphology due to interaction with the surrounding gas. Therefore, TeV $\gamma$-ray sources, related to these nebulae, are expected to be misaligned in respect to GC cores, as observed in the case of GC Ter 5. On the other hand, GCs in low density medium, i.e. far away from the galactic disk, should produce bow shocks at large distances from the GC cores. The TeV $\gamma$-ray sources around such nebulae are expected to be almost spherical and centred on the GC cores. We perform numerical calculations of the TeV $\gamma$-ray emission produced by leptons escaping from the GC Ter 5. It is shown that TeV $\gamma$-ray source related to Ter 5 should be misaligned in respect to the core of GC as observed by the HESS Collaboration.

14 pages, 2 figures, accepted to MNRAS

References in corpus (2)

• A Spitzer Space Telescope Atlas of omega Centauri: The Stellar Population, Mass Loss, and the Intracluster Medium
• Mass Outflow from Red Giant Stars in M13, M15, and M92

Cited by in corpus (10)

• Non-thermal radiation from collisions of compact objects with intermediate scale jets in active galaxies
• TeV gamma-ray emission initiated by the population or individual millisecond pulsars within globular clusters
• Deep observations of the globular cluster M15 with the MAGIC telescopes
• Galactic Observatory Science with the ASTRI Mini-Array at the Observatorio del Teide
• A Search for Very High-Energy Gamma Rays from the Missing Link Binary Pulsar J1023+0038 with VERITAS
• Probing the pulsar population of Terzan 5 via spectral modeling
• How the dynamical properties of globular clusters impact their $\gamma$-ray and X-ray emission
• Assessing Uncertainties in the Predicted Very-High-Energy Flux of Globular Clusters in the Cherenkov Telescope Array Era
• A possible GeV-TeV connection in the direction of the Globular Cluster UKS 1
• A deep Chandra study verifies diffuse non-thermal X-ray emission from the globular cluster Terzan 5