Fermi Large Area Telescope Observations of the Monoceros Loop Supernova Remnant

Abstract

We present an analysis of the gamma-ray measurements by the Large Area Telescope onboard the \textit{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--300~GeV are $\sim$~$4\times 10^{34}$~erg~s${}^{-1}$ for the SNR and $\sim$~$3\times 10^{34}$~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.

Corresponding authors: H. Katagiri and S. Sugiyama

References in corpus (4)

• TEMPO2, a new pulsar timing package. I: Overview
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
• Discovery of a point-like very-high-energy gamma-ray source in Monoceros

Cited by in corpus (6)

• GeV detection of HESS J0632+057
• Molecular Environments of Three Large Supernova Remnants in the Third Galactic Quadrant: G205.5+0.5, G206.9+2.3, and G213.0-0.6
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• Search for new cosmic-ray acceleration sites within the 4FGL catalog Galactic plane sources
• Diffuse gamma-ray emission around the Rosette Nebula