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The $\gamma$-ray spectrum of the source HAWC J1825-134 measured with the HighAltitude Water Cherenkov (HAWC) observatory extends beyond 200 TeV without anyevidence for a steepening or cutoff. There are some indications that the$\gamma$-rays detected with HAWC were produced by cosmic ray protons or nucleicolliding with the ambient gas. Assuming primary protons, we inquire whichshape of the primary proton spectrum is compatible with the HAWC measurements.We find that the primary proton spectrum with the power-law shape of$\gamma_{p}$=2.2 and the cutoff energy $E_{c-p} > 500$ TeV describes the datawell. However, much harder spectra with $\gamma_{p}$ down to 1.3 and $E_{c-p}$as low as 200 TeV also do not contradict the HAWC measurements. The formeroption might be realized if the accelerator is inside or very near to the$\gamma$-ray production zone. The latter option is viable for the case of acosmic ray source which effectively confines low-energy ($E_{p} < 10$ TeV)accelerated protons. Using publicly-available data of the Fermi-LAT space$\gamma$-ray telescope, we derive upper limits on the intensity of the HAWCJ1825-134 source in the 1 GeV -- 1 TeV energy range. We show that the accountof these upper limits drastically changes the interpretation: only hard($\gamma_{p} < 1.7$) spectra describe the combined HAWC and Fermi-LAT datasetswell.

The primary proton spectrum of the hadronic PeVatron candidate HAWC J1825-134