Discovery of very-high-energy -ray emission from the vicinity of PSR J1831-952 with H.E.S.S.

摘要

The H.E.S.S. Galactic Plane Survey (GPS), undertaken since 2004, has revealed more than 60 Very High Energy (VHE) -ray sources. We report on the latest discovery of an extended source near the 67 ms pulsar PSR J1831- 0952. Adopting the dispersion measure distance of the pulsar (4.3 kpc), less than 1% of its spin-down energy would be required to provide the observed luminosity of the VHE source. Multi-wavelength searches have not revealed any other plausible counterpart yet. If the VHE emission originates within a wind nebula around PSR J1831-0952 this would constitute another case of a -ray discovered pulsar wind nebula. The morphology and spectrum of the extended emission, assumed as a single source, are presented and discussed.