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  MAGIC detection of Geminga: an Inverse Compton tail?

The MAGIC Collaboration, Ceribella, G., López-Moya, M., Mirzoyan, R., Acciari, V., Ansoldi, S., et al. (2021). MAGIC detection of Geminga: an Inverse Compton tail? Proceedings of Science, 395, 816.

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The MAGIC Collaboration1, Author
Ceribella, G.1, Author
López-Moya, M.1, Author
Mirzoyan, R.1, Author
Acciari, V.A.1, Author
Ansoldi, S.1, Author
et al.1, Author
Affiliations:
1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650              

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Free keywords: MAGIC
 Abstract: We report the detection of pulsed emission from the Geminga pulsar (PSR J0633+1746) with the MAGIC Telescopes. After the Crab and Vela pulsars, Geminga is the third one detected in the very high energy domain, and its estimated age of ~340 ky makes it the oldest one. The spectrum derived by MAGIC extends from ~15 GeV to 75 GeV and can be well modeled with a simple, soft power-law function. For energies below 40 GeV it overlaps with Fermi-LAT measurements. Joint fits to MAGIC and Fermi-LAT data disfavour the existence of a sub-exponential cut-off in this energy range. Our results are discussed in the framework of the outer gap accelerator model. Such power-law emission can be interpreted as the transition from curvature radiation to inverse Compton (IC) scattering of charges accelerated in the northern outer gap. The IC component is expected to continue towards higher energies. The model fails to fit the overall shape of the spectrum, indicating that a major review is required. The MAGIC Telescopes are two IACTs on the Canary Island of La Palma. In recent years they have significantly improved their performance below 100 GeV with the introduction of a novel trigger system, the Sum-Trigger-II, which halves the energy threshold of the system.

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 Dates: 2021
 Publication Status: Issued
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Title: Proceedings of Science
  Abbreviation : PoS
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 395 Sequence Number: - Start / End Page: 816 Identifier: -

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Title: ICRC2021
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 816 Identifier: -