The Tunka Radio Extension: reconstruction of energy and shower maximum of the first year data (ICRC 2015)
2015
Since its commissioning in autumn 2012, Tunka-Rex, the radio extension of the air-
Cherenkov detectorTunka-133, performed three years of
air showermeasurements. Currently the detector consists of 44 antennas connected to air-Cherenkov and scintillator detectors, respectively, placed in the Tunka valley, Siberia. Triggered by these detectors, Tunka-Rex measures the radio signal up to EeV-scale
air-showers. This configuration provides a unique possibility for cross-calibration between air-Cherenkov, radio and particle techniques. We present reconstruction methods for the energy and the
showermaximum developed with CoREAS simulations, which allow for a precision competitive with the air-Cherenkov technique. We apply these methods to data acquired by Tunka-Rex in the first year which we use for cross-calibration, and we compare the results with the reconstruction of the energy and the
showermaximum by Tunka-133, which provides also a reconstruction for the
showercore used for the radio reconstruction. Our methods have shown that the atmospheric depth of the
showermaximum ($X_\mathrm{max}$) can be reconstructed with a precision of better than 40 g/cm$^2$ for high quality events, in some cases even when only three antenna stations have signal. The energy precision is comparable with the air-Cherenkov precision of 15%. Soon the results will be checked with the independent data of the second year.
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