We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50 GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi). This object, 2FHL J1703.4-4145, displays a very hard >50 GeV spectrum with a photon index Gamma(gamma) similar to 1.2 in the 2FHL catalog and, as such, is one of the most extreme sources in the 2FHL subsample of Galactic objects. A detailed analysis of the available multiwavelength 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 western edge of the Vela SNR.

Eagle, J., Marchesi, S., Castro, D., Ajello, M., Vendrasco, A. (2020). Gamma-Ray Emission Revealed at the Western Edge of SNR G344.7-0.1. THE ASTROPHYSICAL JOURNAL, 904(2), 1-9 [10.3847/1538-4357/abbe08].

Gamma-Ray Emission Revealed at the Western Edge of SNR G344.7-0.1

Marchesi, S
Secondo
;
2020

Abstract

We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50 GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi). This object, 2FHL J1703.4-4145, displays a very hard >50 GeV spectrum with a photon index Gamma(gamma) similar to 1.2 in the 2FHL catalog and, as such, is one of the most extreme sources in the 2FHL subsample of Galactic objects. A detailed analysis of the available multiwavelength 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 western edge of the Vela SNR.
2020
Eagle, J., Marchesi, S., Castro, D., Ajello, M., Vendrasco, A. (2020). Gamma-Ray Emission Revealed at the Western Edge of SNR G344.7-0.1. THE ASTROPHYSICAL JOURNAL, 904(2), 1-9 [10.3847/1538-4357/abbe08].
Eagle, J; Marchesi, S; Castro, D; Ajello, M; Vendrasco, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/919549
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