[Seminars] FW: Virtual Astro Colloquium -Tonia Venters - Wednesday, November 11th, 2020 - Zoom forthcoming

[Ramona Echols]

Wednesday, 11/11/2020 - 3:30 PM

Host: Hsiao-Wen Chen          Zoom Info Forthcoming

Tonia Venters

Goddard

“Multimessenger Astronomy with POEMMA”
The highest energy cosmic rays are the messengers of the most extreme physics in the cosmos; however, efforts to identify their origins have thus far been thwarted by the fact that they don’t point back to their sources. On the other hand, interactions between ultra-high energy cosmic rays (UHECR) and the lower energy particles that they encounter either within their sources or over the course of their cosmic journey will give rise to high-energy neutrinos. The Probe of Extreme Multi-Messenger Astrophysics (POEMMA) is a space-based probe-class mission concept for measuring ultra-high energy cosmic rays (UHECRs) and detecting high-energy cosmic neutrinos via fluorescence and optical Cherenkov signals from their extensive air showers. Using a stereo configuration of two satellites, POEMMA will perform precision measurements for UHECRs above 20 EeV, providing a significant increase in statistics at the highest energies and exposure over the entire celestial sky. POEMMA will also search for Cherenkov signals from tau neutrinos above 20 PeV converting in the Earth near the limb. POEMMA’s design will also feature the capability to slew by as much as 90 degrees in 500 s, allowing for rapid response to target-of-opportunity alerts. We discuss the prospects for multimessenger astronomy with POEMMA, including cross-correlation UHECR anisotropy searches, the detection of the diffuse astrophysical neutrino flux at greater than PeV energies, and the search for high-energy neutrinos associated with transient astrophysical phenomena.
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