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A high performance likelihood reconstruction of gamma-rays for Imaging Atmospheric Cherenkov Telescopes

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arxiv 0907.2610 v3 pith:6NRG4NLZ submitted 2009-07-15 astro-ph.IM astro-ph.HE

Mathieu de Naurois , Loic Rolland This is my paper · ORCID
classification astro-ph.IMastro-ph.HE
keywords reconstructiontechniqueatmosphericcamerabackgroundbettercherenkovcompared
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We present a sophisticated gamma-ray likelihood reconstruction technique for Imaging Atmospheric Cerenkov Telescopes. The technique is based on the comparison of the raw Cherenkov camera pixel images of a photon induced atmospheric particle shower with the predictions from a semi-analytical model. The approach was initiated by the CAT experiment in the 1990's, and has been further developed by a new fit algorithm based on a log-likelihood minimisation using all pixels in the camera, a precise treatment of night sky background noise, the use of stereoscopy and the introduction of first interaction depth as parameter of the model. The reconstruction technique provides a more precise direction and energy reconstruction of the photon induced shower compared to other techniques in use, together with a better gamma efficiency, especially at low energies, as well as an improved background rejection. For data taken with the H.E.S.S. experiment, the reconstruction technique yielded a factor of ~2 better sensitivity compared to the H.E.S.S. standard reconstruction techniques based on second moments of the camera images (Hillas Parameter technique).

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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    astro-ph.HE 2019-08 conditional novelty 6.0 of 10

    H.E.S.S. detected 3C 279 at very high energies during 2017 and 2018 flares, including a January 2018 VHE flare with little simultaneous GeV activity and a multi-day June 2018 coverage of a GeV flare decay.

  2. H.E.S.S. programme searching for VHE gamma rays associated with FRBs

    astro-ph.HE 2025-07 conditional novelty 5.0 of 10

    H.E.S.S. found no very high energy gamma-ray counterpart to targeted fast radio bursts, setting 99% confidence upper limits on their luminosity of 10^44 to 10^48 erg/s.

  3. Observations of blazar PKS 2023-07 in flaring state with HESS and Fermi-LAT in 2016-2017 and constraints on an intrinsic cut-off

    astro-ph.HE 2019-08 conditional novelty 5.0 of 10

    H.E.S.S. non-detections of the z=1.388 blazar PKS 2023-07 during flares, together with Fermi-LAT spectra, imply an intrinsic cutoff below about 35-128 GeV or absorption in the broad line region.

  4. H.E.S.S. searches for TeV gamma rays associated to high-energy neutrinos

    astro-ph.HE 2019-08 accept novelty 4.0 of 10

    H.E.S.S. reports no significant TeV gamma-ray detection at the positions of IceCube neutrinos, including TXS 0506+056, and presents new flux upper limits plus a neutrino-triggered follow-up program.

  5. Multi-wavelength observation of MAXI J1820+070 with MAGIC, VERITAS and H.E.S.S

    astro-ph.HE 2019-08 conditional novelty 4.0 of 10

    MAXI J1820+070 shows no significant very high energy gamma-ray emission above 182 GeV despite a bright X-ray outburst, and optical transient activity drops sharply during state transitions.

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