PIRSA:22100105

# Where are Milky Way’s Hadronic PeVatrons?

### APA

Sudo, T. (2022). Where are Milky Way’s Hadronic PeVatrons? . Perimeter Institute. https://pirsa.org/22100105

### MLA

Sudo, Takahiro. Where are Milky Way’s Hadronic PeVatrons? . Perimeter Institute, Oct. 11, 2022, https://pirsa.org/22100105

### BibTex

```          @misc{ pirsa_22100105,
doi = {10.48660/22100105},
url = {https://pirsa.org/22100105},
author = {Sudo, Takahiro},
keywords = {Particle Physics},
language = {en},
title = {Where are Milky Way{\textquoteright}s Hadronic PeVatrons? },
publisher = {Perimeter Institute},
year = {2022},
month = {oct},
note = {PIRSA:22100105 see, \url{https://pirsa.org}}
}
```

Takahiro Sudo Ohio State University

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## Abstract

Observations indicate the existence of natural particle accelerators in the Milky Way, capable of producing PeV cosmic rays (“PeVatrons”). Observations also indicate the existence of extreme sources in the Milky Way, capable of producing gamma-ray radiations above 100 TeV. If these gamma-ray sources are hadronic cosmic-ray accelerators, then they must also be neutrino sources. However, no neutrino sources have been detected. How can we consistently understand the observations of cosmic rays, gamma rays, and neutrinos? We point out two extreme scenarios are allowed: (1) the hadronic cosmic-ray accelerators and the gamma-ray sources are the same objects, so that neutrino sources exist and improved telescopes can detect them, versus (2) the hadronic cosmic-ray accelerators and the gamma-ray sources are distinct, so that there are no detectable neutrino sources. We discuss the nature of Milky Way’s highest energy gamma-ray sources and outline future prospects toward understanding the origin of hadronic cosmic rays.