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Abstract:
The energy spectrum of cosmic rays, constructed from decades of measurements, exhibits a remarkable power law in energy with a mysterious break at a few Peta-electronvolts (PeV, 10^15 eV), which is usually referred to as the knee. Sources capable of accelerating particles to the knee are called PeVatrons. PeVatrons provide insights into the origin of Galactic cosmic rays. The hunt for PeVatrons in the gamma-ray sky has been significantly advanced lately, thanks to the launches and operation of high-energy and very-high-energy gamma-ray observatories. This talk will present the latest observations of a few candidate PeVatrons, including a microquasar, a stellar superbubble, and a supernova remnant. We explore the connection between gamma-ray and radio, X-ray, and high-energy neutrino emission and explain how the recent observations improve the understanding of the physics of the Galactic cosmic-ray factories.
Biography:
Ke Fang’s research aims at understanding the universe through its energetic messengers, including high-energy neutrinos, gamma rays, and ultrahigh energy cosmic rays. Her work includes analysis efforts on observational data from HAWC, IceCube, and Fermi-LAT, as well as theoretical studies of astroparticle sources using numerical simulations. She currently serves as the spokesperson of the HAWC Collaboration.
Ke joined the Department of Physics at UW-Madison and the Wisconsin IceCube Particle Astrophysics Center (WIPAC) as an assistant professor in 2021. Before that she was an NASA Einstein Fellow at Stanford University (2018-2020) and a Joint Space-science Institute Fellow at University of Maryland and NASA-Goddard (2015-2018). She received her Ph.D. from the University of Chicago in 2015.
Online Meeting Room: https://meeting.tencent.com/dm/9mTt6MRCaFsx
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