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- 24.10. Luca Comisso* (Columbia University): Particle acceleration in highly magnetized plasmas *remote seminar, exceptionally on Thursday 4PM in D5-106
Video available here: https://www.youtube.com/watch?v=_KxfrVZkamE
- 03.12. Karri Koljonen (IFY, NTNU): Cosmic-neighbor-associated distances to blazars
Abstract: tbd: Blazars are active galactic nuclei with relativistic jets directed toward Earth. Relativistic beaming amplifies their brightness, making them appear extremely luminous across multiple wavelengths, from radio to gamma-rays. Consequently, blazars are the most numerous source class among very high-energy gamma-ray emitters. However, determining their redshifts is often challenging because jet emission can obscure spectral lines from the host galaxy or intervening matter. In this talk, I will introduce two methods for estimating blazar distances by associating them with their "cosmic neighborhood". These techniques involve analyzing the optical fields around a blazar using either multi-object spectroscopy or multi-band photometry, combined with the assumption that blazars are typically located in galaxy-rich environments. Accurate redshift estimation for high-redshift blazars is crucial for advancing our understanding of extragalactic very high-energy gamma-ray sources and their interactions with the surrounding universe. Slides available here: https://www.ntnu.no/wiki/download/attachments/195538250/NTNU_seminar_Koljonen.pdf?api=v2