Journal article
TeV emission of galactic plane sources with HAWC and H.E.S.S.
- Abstract:
- 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 γ-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 γ-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 γ-ray flux can be explained by the systematic uncertainties. Therefore, we confirm a consistent view of the γ-ray sky between WCD and IACT techniques.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Accepted manuscript, 2.7MB, Terms of use)
-
- Publisher copy:
- 10.3847/1538-4357/abf64b
Authors
+ Science and Technology Facilities Council
More from this funder
- Grant:
- ST/V001477/1
- ST/V006355/1
- ST/L006499/1
- ST/M00757X/1
- ST/S002618/1
- Publisher:
- IOP Publishing
- Journal:
- Astrophysical Journal More from this journal
- Volume:
- 917
- Issue:
- 1
- Article number:
- 6
- Publication date:
- 2021-08-09
- Acceptance date:
- 2021-04-07
- DOI:
- EISSN:
-
1538-4357
- ISSN:
-
0004-637X
- Language:
-
English
- Keywords:
- Pubs id:
-
1190930
- Local pid:
-
pubs:1190930
- Deposit date:
-
2021-09-05
Terms of use
- Copyright holder:
- American Astronomical Society
- Copyright date:
- 2021
- Rights statement:
- © 2021. The American Astronomical Society. All rights reserved.
- Notes:
- This is the accepted manuscript version of the article. The final version is available online from IOP Publishing at: https://doi.org/10.3847/1538-4357/abf64b
If you are the owner of this record, you can report an update to it here: Report update to this record