English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Globular clusters (GCs) are emerging as a new class of gamma-ray emitters,thanks to the data obtained from the Fermi Gamma-ray Space Telescope. By now,eight GCs are known to emit gamma-rays at energies >100~MeV. Based on thestellar encounter rate of the GCs, we identify potential gamma-ray emitting GCsout of all known GCs that have not been studied in details before. In thispaper, we report the discovery of a number of new gamma-ray GCs: Liller 1, NGC6624, and NGC 6752, and evidence for gamma-ray emission from M80, NGC 6139, andNGC 6541, in which gamma-rays were found within the GC tidal radius. With oneof the highest metallicity among all GCs in the Milky Way, the gamma-rayluminosity of Liller 1 is found to be the highest of all known gamma-ray GCs.In addition, we confirm a previous report of significant gamma-ray emittingregion next to NGC 6441. We briefly discuss the observed offset of gamma-raysfrom some GC cores. The increasing number of known gamma-ray GCs at distancesout to ~10 kpc is important for us to understand the gamma-ray emittingmechanism and provides an alternative probe to the underlying millisecondpulsar populations of the GCs.

Gamma-ray emission from the globular clusters Liller 1, M80, NGC 6139, NGC 6541, NGC 6624, and NGC 6752