Gamma-ray emission revealed at the western edge of SNR G344.7-0.1
Autor: | Jordan Eagle, Daniel Castro, A. Vendrasco, Marco Ajello, Stefano Marchesi |
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Přispěvatelé: | ITA, USA |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Space and Planetary Science High-energy astronomy Astrophysics::High Energy Astrophysical Phenomena Gamma ray FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Edge (geometry) Astrophysics - High Energy Astrophysical Phenomena Astrophysics::Galaxy Astrophysics |
Popis: | We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope. This object, 2FHL J1703.4-4145, displays a very hard >50GeV spectrum with a photon index ~1.2 in the 2FHL catalog and, as such, is one of the most extreme sources in the 2FHL sub-sample of Galactic objects. A detailed analysis of the available multi-wavelength data shows that this source is located on the western edge of the supernova remnant (SNR) G344.7--0.1, along with extended TeV source, HESS J1702-420. The observations and the spectral energy distribution modeling support a scenario where this gamma-ray source is the byproduct of the interaction between the SNR shock and the dense surrounding medium, with escaping cosmic rays (CRs) diffusing into the dense environment and interacting with a large local cloud, generating the observed TeV emission. If confirmed, an interaction between the SNR CRs and a nearby cloud would make 2FHL J1703.4-4145 another promising candidate for efficient particle acceleration of the 2FHL Galactic sample, following the first candidate from our previous investigation of a likely shock-cloud interaction occurring on the West edge of the Vela SNR. 9 pages, 7 figures, Submitted to ApJ June 15, 2020. Accepted for publication Oct 2, 2020 |
Databáze: | OpenAIRE |
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