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Title: Fermi/LAT study of gamma-ray emission in the direction of the monceros loop supernova remnant

Here, 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 $$\sim 4\times {10}^{34}$$ erg s -1 for the SNR and $$\sim 3\times {10}^{34}$$ erg s -1 for the Rosette Nebula, respectively. We also argue that the gamma-rays likely originate from the interactions of particles accelerated in the SNR. Furthermore, 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.
 [1] ;  [1] ;  [2] ; ORCiD logo [3] ;  [3] ;  [4] ;  [5] ; ORCiD logo [6] ; ORCiD logo [7] ;  [8] ;  [9]
  1. Ibaraki Univ. (Japan). College of Science
  2. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
  3. Commission for Atomic Energy(CEA-IRFU), Saclay (France). Research Institute of the fundamental laws of the Universe French National Center for Scientific Research (CNRS) and Univ. of Paris (France)
  4. Univ. of Tokyo (Japan). Inst. for Cosmic Ray Research
  5. Univ. of North Florida, Jacksonville, FL (United States). Dept. of Physics
  6. Commonwealth Scientific and Industrial Research Organisation (CSIRO), Epping (Australia). Astronomy and Space Science
  7. Kyoto Univ. (Japan). Dept. of Physics
  8. Univ. of Bordeaux and CNRS/IN2P3 (France). Center for Nuclear Studies of Bordeaux Gradignan
  9. Naval Research Lab. (NRL), Washington, DC (United States). Space Science Division
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 831; Journal Issue: 1; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; cosmic rays; acceleration of particles; ISM: individual objects (the Monoceros Loop); ISM: supernova remanants; gamma rays: ISM
OSTI Identifier: