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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 14: Relativistic Astrophysics IV

GR 14.2: Vortrag

Donnerstag, 19. März 2026, 16:30–16:45, KH 01.016

Neutrino production in blazars with extreme Doppler factors — •Aditya Tamar — Max Planck Institute for Radio Astronomy, Bonn, Germany

There have been recent population studies supporting the idea that radio-loud blazars can be the potential source of high-energy astrophysical neutrinos. The understanding of neutrino production from these sources is intimately connected to explaining their multi-wavelength spectra as well. In this talk, ongoing work will be presented in modelling the lepto-hadronic spectral energy distribution (SED) for PKS 1749+096, a neutrino-candidate blazar with strong Doppler boosting. In the proposed framework, both the bulk properties and the particle distribution in the emission region, are anchored directly using parsec-scale very-long-baseline (VLBI) observations of its jet. When combined with physically motivated assumptions about jet stratification, this approach allows modeling the SED from radio to gamma-rays without using model-agnostic numerical fitting to archival data, whilst also using VLBI-driven inferences to probe the location and properties of the neutrino production region in the blazar jet. Thus, the talk attempts to motivate using radio observations as an anchor for improving our understanding of multi-messenger emission from neutrino-candiate blazars.

Keywords: Blazars; Very long baseline interferometry; Relativistic jets; Neutrinos