Title: New Theoretical Insights into the Nonthermal Sky Based on Observations of Very-High-Energy Particles

Abstract: It is widely believed that supernova remnants are the most important sources for the galactic nonthermal emission. However, many observations cannot be accounted for in this scenario. In the TeV gamma rays, the diffuse emission from the Galactic disk is significantly brighter than expected. Furthermore, the nature of many TeV sources in the Galaxy has not been clear. In the radio band, recent observations suggest a peculiar excess emission in galaxies with low star-formation rates. In this talk, I will discuss the importance of pulsars for these problems. In particular, we focus on the theoretical implications from the observations of “TeV halos”, a source class which is discovered around nearby pulsars. We show that pulsar emission can dominate the TeV gamma-ray sky, explaining the majority of diffuse emission as well as the source counts. Then, we show that recycled pulsars can significantly contribute to the galactic nonthermal emission, explaining the radio excess. We discuss the implications for the studies of cosmic rays, gamma rays, and pulsars.

The talk can be attended via the following zoom link
https://huji.zoom.us/j/98933006798?pwd=Ylc0ck05ZFR4L2FWdHRjQ01DTlJKZz09

Meeting ID: 989 3300 6798
Passcode: w31c0m3