Abdalla (2021) - TeV Emission of Galactic Plane Sources with HAWC and H.E.S.S.
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Highlights
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Table of Contents
0. Abstract
- HAWC (using WCD technique) and H.E.S.S. (using IACT techique) differ in multiple aspects, incl. their observation strategy, their F.O.V., and their AngRes, leading to different analysis approaches.
- Tensions between HAWC and H.E.S.S.
- only a few of several recently discovered HAWC sources were detected again by IACTs.
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Are the observation of the two types of instruments consistent?
- Our work
- Events above 1 TeV from the Galactic plane survey data of both experiments are selected. (1st detailed comparison of them two)
- Point-spread function of H.E.S.S. is broadened to approach that of HAWC.
- Out of 7 HAWC sources previously undetected by IACTs
- 4 can be confirmed by H.E.S.S.
- 3 have sensitivities lower than that of H.E.S.S.
- Other difference can be explained by systematic uncertainties.
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We confirm a consistent view of the γ-ray sky between WCD and IACT techniques.
1. Introduction
H.E.S.S. (High Energy Stereoscopic System)
- an array of 5 imaging atmospheric Cherenkov telescopes (IACTs) that image the Che-light produced by EAS induced by VHE γ-rays
- location: Namibia
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(23°S), alt. 1800 m
- collection area 105 m2
- performance
- sensitive to > 1 TeV
- F.O.V. = 5°, sensitivity uniform within 2°
- point-spread function (PSF) is better than 0.1° above 1 TeV for zenith angles less than 30°
- only operating at night (i.e. low duty cycle)
- H.E.S.S. Galactic Plane Survey (HGPS)
- by H.E.S.S. phase I (4 mid-sized telescopes)
- during 2004–2013
- 2700 hours of selected data
- 78 detected γ-ray sources
- gal. lat. mainly within (extending to in some regions)
- threshold for the hard cuts: 400–700 GeV
- assuming spectral index and achieving sensitivity
- Crab
- Crab, in some regions observed longer, e.g. GC
HAWC (High-Altitude Water Cherenkov Observatory)
- an array of 300 water Cherenkov detectors (WCDs) that measure Che-light from the passage of EAS through water
- location: Mexico
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(19°N), alt. 4100 m
- collection area ~104 m2
- performance
- sensitive > 500 GeV (at Crab's dec.)
- F.O.V. ~ 2 sr
- in essential a survey instrument (i.e. high duty cycle)
- assuming spectral index and achieving sensitivity
- Crab ()
- Crab at the edge of HAWC's F.O.V. ()
- poor EneRes design of analysis bin[?]
- PSF ~1° (1st bin) – 0.2° (9th bin)
- catalogs
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Complete author list