Search for VHE $γ$-ray emission from the globular cluster M13 with the MAGIC telescope

Details Search for VHE $γ$-ray emission from the globular cluster M13 with the MAGIC telescope Search for VHE $γ$-ray emission from the globular cluster M13 with the MAGIC telescope

2009-05-14

arxiv.org/abs/0905.2427v1

Astrophys.J.702:266-269,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Scientific paper

10.1088/0004-637X/702/1/266

Based on MAGIC observations from June and July 2007, we have obtained an integral upper limit to the VHE energy emission of the globular cluster M13 of $F(E>200 \textrm{GeV})<5.1\times10^{-12} \textrm{cm}^{-2} \textrm{s}^{-1}$, and differential upper limits for $E>140 \textrm{GeV}$. Those limits allow us to constrain the population of millisecond pulsars within M13 and to test models for acceleration of leptons inside their magnetospheres and surrounding. We conclude that in M13 either millisecond pulsars are fewer than expected or they accelerate leptons less efficiently than predicted.

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