TY  - JOUR
AU  - HAWC and HESS Collaborations (Abdalla, H. et al
AU  - Salesa Greus, F.
PY  - 2021
DA  - 2021//
TI  - TeV Emission of Galactic Plane Sources with HAWC and HESS
T2  - Astrophys. J.
JO  - Astrophysical Journal
SP  - 6 - 16pp
VL  - 917
IS  - 1
PB  - Iop Publishing Ltd
AB  - The High Altitude Water Cherenkov (HAWC) observatory and the High Energy Stereoscopic System (H.E.S.S.) are two leading instruments in the ground-based very-high-energy gamma-ray domain. HAWC employs the water Cherenkov detection (WCD) technique, while H.E.S.S. is an array of Imaging Atmospheric Cherenkov Telescopes (IACTs). The two facilities therefore differ in multiple aspects, including their observation strategy, the size of their field of view, and their angular resolution, leading to different analysis approaches. Until now, it has been unclear if the results of observations by both types of instruments are consistent: several of the recently discovered HAWC sources have been followed up by IACTs, resulting in a confirmed detection only in a minority of cases. With this paper, we go further and try to resolve the tensions between previous results by performing a new analysis of the H.E.S.S. Galactic plane survey data, applying an analysis technique comparable between H.E.S.S. and HAWC. Events above 1 TeV are selected for both data sets, the point-spread function of H.E.S.S. is broadened to approach that of HAWC, and a similar background estimation method is used. This is the first detailed comparison of the Galactic plane observed by both instruments. H.E.S.S. can confirm the gamma-ray emission of four HAWC sources among seven previously undetected by IACTs, while the three others have measured fluxes below the sensitivity of the H.E.S.S. data set. Remaining differences in the overall gamma-ray flux can be explained by the systematic uncertainties. Therefore, we confirm a consistent view of the gamma-ray sky between WCD and IACT techniques.
SN  - 0004-637x
UR  - https://arxiv.org/abs/2107.01425
UR  - https://doi.org/10.3847/1538-4357/abf64b
DO  - 10.3847/1538-4357/abf64b
LA  - English
N1  - WOS:000683127600001
ID  - HAWCandHESSCollaborationsAbdalla+SalesaGreus2021
ER  -