Teamwork makes the dream work

Principal investigator

Emma Kun (personal website →)

Emma is an astrophysicist at Konkoly Observatory (HUN-REN CSFK) and the Principal Investigator of NuLab. Her research focuses on the origin of high-energy cosmic neutrinos in active galactic nuclei, from radio-quiet Seyfert galaxies to relativistic blazars, and on identifying the physical environments in which cosmic particles are accelerated to extreme energies.

She led the work reporting observational evidence for a connection between the intrinsic hard X-ray and neutrino luminosities of IceCube-associated AGN. Within NuLab, she leads the multimessenger strategy combining IceCube neutrinos with hard X-ray, gamma-ray, radio/VLBI, cosmic-ray, and gravitational-wave observations, including population-level neutrino searches and studies of individual candidate sources.

Her second major research line concerns supermassive black hole binaries. Using long-term VLBI observations and relativistic jet models, she studies how binary-driven jet precession may produce periodic electromagnetic and neutrino signatures and connect AGN to the gravitational-wave sky.

Outside NuLab, Emma also works on cosmopaleontology: the possible imprint of the Solar System's motion through the Galaxy and changing cosmic-ray exposure on the Earth's marine fossil record.

Postdoctoral researcher

Máté Krezinger

Máté is a radio astronomer specializing in high-resolution very long baseline interferometry (VLBI) of active galactic nuclei. His research uses the parsec-scale structure and evolution of relativistic jets to understand their geometry, dynamics, and long-term variability.

Within NuLab, he leads the systematic VLBI analysis of our AGN samples. He is developing an automated pipeline for imaging and modelling multi-epoch 15 GHz MOJAVE observations, allowing jet components to be tracked consistently across large source samples. These measurements provide proper motions, apparent jet speeds, ridge lines, position-angle evolution, opening angles, and other observables that can be compared directly with high-energy activity.

His work is particularly important for locating candidate neutrino-emission regions and for identifying the dynamical signatures of supermassive black hole binaries, including jet bending and precession. He also combines VLBI measurements with long-term single-dish radio monitoring to connect jet kinematics with variability across different physical scales.