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Fermi/LAT Study of Gamma-Ray Emission in the Direction of the Monoceros Loop Supernova Remnant

Abstract : We present an analysis of the gamma-ray measurements by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) Monoceros Loop (G205.5+0.5). The brightest gamma-ray peak is spatially correlated with the Rosette Nebula, which is a molecular cloud complex adjacent to the southeast edge of the SNR. After subtraction of this emission by spatial modeling, the gamma-ray emission from the SNR emerges, which is extended and fit by a Gaussian spatial template. The gamma-ray spectra are significantly better reproduced by a curved shape than a simple power law. The luminosities between 0.2 and 300 GeV are ∼ 4× {10}34 erg s-1 for the SNR and ∼ 3× {10}34 erg s-1 for the Rosette Nebula, respectively. We argue that the gamma-rays likely originate from the interactions of particles accelerated in the SNR. The decay of neutral pions produced in nucleon-nucleon interactions of accelerated hadrons with interstellar gas provides a reasonable explanation for the gamma-ray emission of both the Rosette Nebula and the Monoceros SNR.
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Submitted on : Friday, August 5, 2022 - 8:52:12 AM
Last modification on : Sunday, August 7, 2022 - 3:22:50 AM

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H. Katagiri, S. Sugiyama, M. Ackermann, J. Ballet, J. M. Casandjian, et al.. Fermi/LAT Study of Gamma-Ray Emission in the Direction of the Monoceros Loop Supernova Remnant. The Astrophysical Journal, 2016, 831, ⟨10.3847/0004-637X/831/1/106⟩. ⟨insu-03746215⟩

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