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H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A

MPS-Authors
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Aharonian,  Felix A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Ait Benkhali,  Faical
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Bernlöhr,  Konrad
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Brun,  Francois
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Carrigan,  Svenja
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Casanova,  Sabrina
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Deil,  Christoph
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Domainko,  Wilfried
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Edwards,  Tanya
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Eger,  Peter
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Förster,  Andreas
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Grondin,  Marie-Hélène
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hahn,  Joachim
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hermann,  German
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hillert,  Andreas
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hofmann,  Werner
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Hofverberg,  Petter
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Krüger,  Paulus
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Lennarz,  Dirk
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Lu,  Chia-Chun
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Marandon,  Vincent
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Marx,  Ramin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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de Ona Wilhelmi,  Emma
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Panter,  Michael
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Parsons,  Daniel
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Poon,  Helen
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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de los Reyes,  R.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Rieger,  Frank
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Viana,  Aion
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Völk,  Heinrich J.
Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Volpe,  Francesca
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Weitzel,  Quirin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zabalza,  Victor
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Fulltext (public)

1412.6997v1
(Preprint), 332KB

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There is no public supplementary material available
Citation

H. E. S. S., C., Abramowski, A., Aharonian, F. A., Ait Benkhali, F., Akhperjanian, A. G., Angüner, E., et al. (2015). H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A. Astronomy and Astrophysics, 575: A81. doi:10.1051/0004-6361/201424805.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-E559-1
Abstract
Context. Puppis A is an interesting ~4 kyr-old supernova remnant (SNR) that shows strong evidence of interaction between the forward shock and a molecular cloud. It has been studied in detail from radio frequencies to high-energy (HE, 0.1−100 GeV) γ-rays. An analysis of the Fermi-LAT data has shown extended HE γ-ray emission with a 0.2−100 GeV spectrum exhibiting no significant deviation from a power law, unlike most of the GeV-emitting SNRs known to be interacting with molecular clouds. This makes it a promising target for imaging atmospheric Cherenkov telescopes (IACTs) to probe the γ-ray emission above 100 GeV. Aims. Very-high-energy (VHE, E ≥ 0.1 TeV) γ-ray emission from Puppis A has been, for the first time, searched for with the High Energy Stereoscopic System (H.E.S.S.). Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the direction and energy of the incident γ-rays in order to produce sky images and source spectra. The profile likelihood method is applied to find constraints on the existence of a potential break or cutoff in the photon spectrum. Results. The analysis of the H.E.S.S. data does not reveal any significant emission towards Puppis A. The derived upper limits on the differential photon flux imply that its broadband γ-ray spectrum must exhibit a spectral break or cutoff. By combining Fermi-LAT and H.E.S.S. measurements, the 99% confidence-level upper limits on such a cutoff are found to be 450 and 280 GeV, assuming a power law with a simple exponential and a sub-exponential cutoff, respectively. It is concluded that none of the standard limitations (age, size, radiative losses) on the particle acceleration mechanism, assumed to be continuing at present, can explain the lack of VHE signal. The scenario in which particle acceleration has ceased some time ago is considered as an alternative explanation. The HE/VHE spectrum of Puppis A could then exhibit a break of non-radiative origin (as observed in several other interacting SNRs, albeit at somewhat higher energies), owing to the interaction with dense and neutral material, in particular towards the NE region.