| Number | R8-2/ IPMU/ILANCE/ICRR joint seminar |
| Date&time | 2026年4月28日（火） 15:00 – |
| Place | 宇宙線研究所6階大セミナー室 Zoom: https://u-tokyo-ac-jp.zoom.us/j/84250317931?pwd=YK39f6i3Hb3ubboIXFEc5RkGKwZO8H.1 |
| Speaker | Satoshi Fukami (DESY Zeuthen, Germany) |
| Title | “IceCube search for neutrinos from AGN central regions and status of IceCube Upgrade” |
| Abstract | High-energy neutrinos (above ~100 GeV) are essential to search for cosmic ray accelerators. As the world’s leading neutrino observatory in this energy range, it has identified neutrino emission from several source classes. Among those, central regions of nearby active galactic nuclei (AGN) are a promising candidate for steady cosmic-ray production sites in the extragalactic sky, confirmed by a recent IceCube correlation study with X-ray bright Seyfert galaxies. While IceCube studies have frequently utilised AGNs detected in the all-sky hard X-ray survey by Swift-BAT, its sub-degree PSF can lead to contamination from broader components such as AGN jets and starburst activities. In the first part of this talk, I will present a novel AGN catalog constructed from optical spectroscopy and share the current status of the correlation study with the latest IceCube neutrino dataset. In the second part, I will report on the recent deployment to the South Pole for the IceCube Upgrade. While IceCube Upgrade’s main science target is related to neutrino oscillation physics, it will also allow for studies of neutrino transients in the GeV energies and better reconstruction of archival data by refining the optical properties of the ice with newly installed calibration devices. |
