FERMI/LAT STUDY of GAMMA-RAY EMISSION in the DIRECTION of the MONOCEROS LOOP SUPERNOVA REMNANT
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 erg s-1 for the SNR and 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.
Digital Object Identifier (DOI)
Katagiri, Sugiyama, S., Ackermann, M., Ballet, J., Casandjian, J. M., Hanabata, Y., Hewitt, J. W., Kerr, M., Kubo, H., Lemoine-Goumard, M., & Ray, P. S. (2016). (Fermi Fermi)/LAT study of gamma-ray emission in the direction of the Monoceros Loop supernova remnant. The Astrophysical Journal, 831(1), 106.