The Primary Proton Spectrum of the Hadronic PeVatron Candidate HAWC J1825-134

Dzhatdoev, T.; Podlesnyi, E.; Vaiman, I.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 мая 2022 г.

Авторы: Dzhatdoev Timur, Podlesnyi Egor, Vaiman Igor
Журнал: Astrophysical Journal
Том: 929
Номер: 1
Год издания: 2022
Издательство: University of Chicago Press
Местоположение издательства: United States
Первая страница: 25
DOI: 10.3847/1538-4357/ac5bd3
Аннотация: The γ-ray spectrum of the source HAWC J1825-134 measured with the High Altitude Water Cherenkov (HAWC) observatory extends beyond 200 TeV without any evidence for a steepening or cutoff. There are some indications that the γ-rays detected with HAWC were produced by cosmic-ray protons or nuclei colliding with the ambient gas. Assuming primary protons, we inquire which shape of the primary proton spectrum is compatible with the HAWC measurements. We find that the primary proton spectrum with the power-law shape of γp = 2.2 and the cutoff energy Ec−p > 500 TeV describes the data well. However, much harder spectra with γp down to 1.3 and Ec−p as low as 200 TeV also do not contradict the HAWC measurements. The former option might be realized if the accelerator is inside or very near to the γ-ray production zone. The latter option is viable for the case of a cosmic-ray source that effectively confines low-energy (Ep < 10 TeV) accelerated protons. Using publicly available data of the Fermi-LAT space γ-ray telescope, we derive upper limits on the intensity of the HAWC J1825-134 source in the 1 GeV–1 TeV energy range. We show that the account of these upper limits drastically changes the interpretation: only hard (γp < 1.7) spectra describe the combined HAWC and Fermi-LAT data sets well.
Добавил в систему: Подлесный Егор Игоревич

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