Discovery of the mysterious gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

TL;DR

This paper reports the detection of a faint gamma-ray source HESS J1832-093 near SNR G22.7-0.2 using advanced analysis techniques, and explores possible origins through multi-wavelength observations.

Contribution

It presents the discovery of a new gamma-ray source with H.E.S.S. and discusses potential astrophysical scenarios based on multi-wavelength data.

Findings

Detection of HESS J1832-093 near SNR G22.7-0.2

Possible origins include hadronic processes, pulsar wind nebula, or binary system

Multi-wavelength analysis constrains source nature

Abstract

Thanks to the use of advanced analysis techniques, the H.E.S.S. imaging Cherenkov telescope array has now reached a sensitivity level allowing the detection of sources with fluxes around 1% of the Crab with a limited observation time (less than ~100 hours). 67 hours of observations in the region of the supernova remnant G22.7-0.2 thus yielded the detection of the faint point-like source HESS J1832-093 in spatial coincidence with a part of the radio shell of the supernova remnant. A multi-wavelength search for counterparts was then performed and led to the elaboration of various scenarii in order to explain the origin of the very high energy excess. The presence of molecular clouds in the line of sight could indicate a hadronic origin through \pi^0 production and decay. However, the discovery of an X-ray point source and its potential infrared counterpart give rise to other possibilities such as a pulsar wind nebula nature or a binary system. The latest results on this source are presented as well as the different scenarii brought by the multi-wavelength observations.