Fermi LAT Discovery of Extended Gamma-Ray Emissions in the Vicinity of the HB3 Supernova Remnant

Abstract

We report the discovery of extended gamma-ray emission measured by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) HB3 (G132.7+1.3) and the W3 HII complex adjacent to the southeast of the remnant. W3 is spatially associated with bright 12CO (J=1-0) emission. The gamma-ray emission is spatially correlated with this gas and the SNR. We discuss the possibility that gamma rays originate in interactions between particles accelerated in the SNR and interstellar gas or radiation fields. The decay of neutral pions produced in nucleon-nucleon interactions between accelerated hadrons and interstellar gas provides a reasonable explanation for the gamma-ray emission. The emission from W3 is consistent with irradiation of the CO clouds by the cosmic rays accelerated in HB3.

Corresponding authors: H. Katagiri and K. Yoshida. arXiv admin note: substantial text overlap with arXiv:1108.1833

References in corpus (6)

• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration
• Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
• Fermi-LAT Discovery of GeV Gamma-ray Emission from the Vicinity of SNR W44
• Detailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT
• The Gas Properties of the W3 GMC: A HARP study

Cited by in corpus (8)

• Fermi Large Area Telescope Fourth Source Catalog
• 3FHL: The Third Catalog of Hard Fermi-LAT Sources
• Evolution of high-energy particle distribution in Supernova Remnants
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• Deep optical study of the mixed-morphology supernova remnant G 132.7+1.3 (HB3)
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• Fermi Large Area Telescope Observations of the Monoceros Loop Supernova Remnant
• Search for new cosmic-ray acceleration sites within the 4FGL catalog Galactic plane sources