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Extreme high-energy peaked BL Lac objects (EHBLs) are an emerging class ofblazars. Their typical two-hump structured spectral energy distribution (SED)peaks at higher energies with respect to conventional blazars. Multi-wavelength(MWL) observations constrain their synchrotron peak in the medium to hard X-rayband. Their gamma-ray SED peaks above the GeV band, and in some objects itextends up to several TeV. Up to now, only a few EHBLs have been detected inthe TeV gamma-ray range. In this paper, we report the detection of the EHBL2WHSP J073326.7+515354, observed and detected during 2018 in TeV gamma rayswith the MAGIC telescopes. The broad-band SED is studied within a MWL context,including an analysis of the Fermi-LAT data over ten years of observation andwith simultaneous Swift-XRT, Swift-UVOT, and KVA data. Our analysis results ina set of spectral parameters that confirms the classification of the source asan EHBL. In order to investigate the physical nature of this extreme emission,different theoretical frameworks were tested to model the broad-band SED. Thehard TeV spectrum of 2WHSP J073326.7+515354 sets the SED far from the energyequipartition regime in the standard one-zone leptonic scenario of blazaremission. Conversely, more complex models of the jet, represented by either atwo-zone spine-layer model or a hadronic emission model, better represent thebroad-band SED.

Testing emission models on the extreme blazar 2WHSP J073326.7+515354 detected at very high energies with the MAGIC telescopes