Multi-telescope spectral modeling of HESS J1825-137 using Naima and MCMC shows leptonic dominance for existing GeV-TeV data but lepto-hadronic preference when adding simulated CTAO or LHAASO UHE points.
VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC telescope
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abstract
We report about very high energy (VHE) gamma-ray observations of the Crab Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was measured between 60 GeV and 9 TeV. The energy spectrum can be described with a curved power law dF/dE=f0 (E/300 GeV)^(a+b*log10(E/300 GeV)) with a flux normalization f0 of(6.0+-0.2)*10^-10 1/(cm^2 s TeV), a=-2.31+-0.06 and b=-0.26+-0.07. The position of the IC-peak is determined at (77+-47) GeV. Within the observation time and the experimental resolution of the telescope, the gamma-ray emission is steady and pointlike. The emission's center of gravity coincides with the position of the pulsar. Pulsed gamma-ray emission from the pulsar could not be detected. We constrain the cutoff energy of the spectrum to be less than 27 GeV, assuming that the differential energy spectrum has an exponential cutoff. For a super-exponential shape, the cutoff energy can be as high as 60 GeV.
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Constraining leptonic and hadronic gamma-ray emission from HESS J1825-137 and its environment
Multi-telescope spectral modeling of HESS J1825-137 using Naima and MCMC shows leptonic dominance for existing GeV-TeV data but lepto-hadronic preference when adding simulated CTAO or LHAASO UHE points.