A GeV source in the direction of Supernova Remnant CTB 37B

Abstract

Supernova remnants (SNRs) are the most attractive candidates for the acceleration sites of Galactic cosmic rays. We report the detection of GeV $\gamma$-ray emission with the Pass 8 events recorded by Fermi Large Area Telescope (Fermi-LAT) in the vicinity of the shell type SNR CTB 37B that is likely associated with the TeV $\gamma -$ray source HESS J1713-381. The photon spectrum of CTB 37B is consistent with a power-law with an index of $1.89\pm 0.08$ in the energy range of $0.5-500$ GeV, and the measured flux connects smoothly with that of HESS J1713-381 at a few hundred GeV. No significant spatial extension and time variation are detected. The multi-wavelength data can be well fitted with either a leptonic model or a hadronic one. However, parameters of both models suggest more efficient particle acceleration than typical SNRs. Meanwhile, the X-ray and $\gamma$-ray spectral properties of CTB 37B show that it is an interesting source bridging young SNRs dominated by non-thermal emission and old SNRs interacting with molecular clouds.

6 pages, 5 figures, 2 tables, published in ApJ, 817, 64

References in corpus (12)

• Observations of the Crab Nebula with H.E.S.S
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• Primary particle acceleration above 100 TeV in the shell-type Supernova Remnant RX J1713.7-3946 with deep H.E.S.S. observations
• Observations of the young supernova remnant RX J1713.7-3946 with the Fermi Large Area Telescope
• H.E.S.S. observations of the supernova remnant RX J0852.0-4622: shell-type morphology and spectrum of a widely extended VHE gamma-ray source
• First detection of VHE gamma-rays from SN 1006 by H.E.S.S
• Inverse Compton Emission from Galactic Supernova Remnants: Effect of the Interstellar Radiation Field
• Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS
• Unified model for the gamma-ray emission of supernova remnants
• Modeling the Multi-Wavelength Emission of Shell-Type Supernova Remnant RX J1713.7-3946
• Fermi Large Area Telescope Detection of Supernova Remnant RCW 86
• Fermi Large Area Telescope observations of the supernova remnant HESS J1731-347

Cited by in corpus (14)

• Search for extended sources in the Galactic Plane using 6 years of Fermi-Large Area Telescope Pass 8 data above 10 GeV
• Evolution of high-energy particle distribution in Supernova Remnants
• Gamma-ray upper limits on magnetars with 6 years of Fermi-LAT observations
• Detection of GeV $\gamma$-ray emission in the direction of HESS J1731-347 with Fermi-LAT
• Evolution of High-Energy Particle Distribution in Mature Shell-Type Supernova Remnants
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• HESS J1427-608: an unusual hard unbroken $\gamma -$ray spectrum in a very wide energy range
• X-ray Monitoring of the Magnetar CXOU J171405.7-381031 in SNR CTB 37B
• X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU J171405.7-381031
• Prospects for gamma-ray emission from magnetar regions in CTAO observations
• XMM-Newton Spectrum of the magnetar CXOU J171405.7-381031
• Exploring the nature of Galactic unassociated sources detected by the Fermi-LAT