Fermi Large Area Telescope Observations of the Monoceros Loop Supernova Remnant
H. Katagiri, S. Sugiyama, M. Ackermann, J. Ballet, J.M. Casandjian, Y., Hanabata, J.W. Hewitt, M. Kerr, H. Kubo, M. Lemoine-Goumard, and P.S. Ray

TL;DR
This paper analyzes Fermi LAT gamma-ray data of the Monoceros Loop SNR, revealing extended emission correlated with the SNR and nearby molecular cloud, with spectra favoring a curved shape and suggesting hadronic interactions as the emission origin.
Contribution
First detailed gamma-ray analysis of the Monoceros SNR showing spatial and spectral characteristics, supporting hadronic origin of the emission.
Findings
Gamma-ray emission is spatially extended and correlated with the SNR.
Spectra are better fit by a curved shape than a simple power law.
Gamma-ray luminosities are approximately 4 x 10^{34} erg/s for the SNR and 3 x 10^{34} erg/s for the Rosette Nebula.
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~(G205.50.5). 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 ~~erg~s for the SNR and ~~erg~s for the Rosette Nebula, respectively. We argue that the gamma rays likely originate from the interactions of particles accelerated in the…
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