The H.E.S.S .
very-high-energy ( VHE , E > 0.1 TeV ) gamma-ray telescope system has discovered a new source , HESS~J1747-248 .
The measured integral flux is ( 1.2 \pm 0.3 ) \times 10 ^ { -12 } cm ^ { -2 } s ^ { -1 } above 440 GeV for a power-law photon spectral index of 2.5 \pm 0.3 _ { \mathrm { stat } } \pm 0.2 _ { \mathrm { sys } } .
The VHE gamma-ray source is located in the close vicinity of the Galactic globular cluster Terzan~5 and extends beyond the H.E.S.S .
point spread function ( 0.07° ) .
The probability of a chance coincidence with Terzan 5 and an unrelated VHE source is quite low ( \sim 10 ^ { -4 } ) .
With the largest population of identified millisecond pulsars ( msPSRs ) , a very high core stellar density and the brightest GeV range flux as measured by Fermi -LAT , Terzan 5 stands out among Galactic globular clusters .
The properties of the VHE source are briefly discussed in the context of potential emission mechanisms , notably in relation to msPSRs .
Interpretation of the available data accommodates several possible origins for this VHE gamma-ray source , although none of them offers a satisfying explanation of its peculiar morphology .