Fermi-LAT Observations and A Broadband Study of Supernova Remnant CTB 109
arXiv:1207.1432 · doi:10.1088/0004-637X/756/1/88
Abstract
CTB 109 (G109.1-1.0) is a Galactic supernova remnant (SNR) with a hemispherical shell morphology in X-rays and in the radio band. In this work we report the detection of γ-ray emission coincident with CTB 109, using 37 months of data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. We study the broadband characteristics of the remnant using a model that includes hydrodynamics, efficient cosmic ray acceleration, nonthermal emission and a self-consistent calculation of the X-ray thermal emission. We find that the observations can be successfully fit with two distinct parameter sets, one where the γ-ray emission is produced primarily by leptons accelerated at the SNR forward shock and the other where γ-rays produced by forward shock accelerated cosmic-ray ions dominate the high-energy emission. Consideration of thermal X-ray emission introduces a novel element to the broadband fitting process, and while it does not rule out either the leptonic or the hadronic scenarios, it constrains the parameter sets required by the model to fit the observations. Moreover, the model which best fits the thermal and nonthermal emission observations is an intermediate case, where both radiation from accelerated electrons and hadrons contribute almost equally to the γ-ray flux observed.
10 pages, 6 figures. Accepted for publication in ApJ
References in corpus (8)
- Parameterization of Gamma, e^+/- and Neutrino Spectra Produced by p-p Interaction in Astronomical Environment
- Observations of the young supernova remnant RX J1713.7-3946 with the Fermi Large Area Telescope
- Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars
- Measuring the cosmic ray acceleration efficiency of a supernova remnant
- The XMM-Newton EPIC Background and the production of Background Blank Sky Event Files
- Distances to Anomalous X-ray Pulsars using Red Clump Stars
- Magnetar Driven Bubbles and the Origin of Collimated Outflows in Gamma-ray Bursts
- Evidence for Shocked Molecular Gas in the Galactic SNR CTB 109 (G109.1-1.0)
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