Using Thermal X-ray Emission to Constrain the Origin of GeV-TeV Gamma Rays in Galactic Supernova Remnants

Details Using Thermal X-ray Emission to Constrain the Origin of GeV-TeV Gamma Rays in Galactic Supernova Remnants Using Thermal X-ray Emission to Constrain the Origin of GeV-TeV Gamma Rays in Galactic Supernova Remnants

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1812p&link_type=abstract

American Astronomical Society, HEAD meeting #11, #18.12; Bulletin of the American Astronomical Society, Vol. 41, p.688

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a model for the broad-band emission from SNR RX J1713.7-3946 that includes, for the first time, a consistent calculation of thermal X-ray emission together with non-thermal emission in a nonlinear diffusive shock acceleration model. Our model tracks both the hydrodynamical evolution of the SNR as well as the time dependent nonequilibrium ionization of shock heated material. We couple this NEI to a plasma emissivity code to predict the thermal X-ray emission from the shocked, swept up ambient material. We find that models where the TeV gamma-rays come from pion-decay result in copious thermal X-ray emission, which is not seen in recent Suzaku observations of RX J1713.7-3946. The non-detection of thermal X-rays places a strong constraint on the density of the unshocked circumstellar medium, and definitively rules out pion-decay as the emission process producing the GeV-TeV photons. We show that leptonic models, where inverse-Compton against the cosmic background radiation dominates the GeV-TeV emission, can produce satisfactory fits to the broad-band thermal and nonthermal emission.

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