Speaker
Description
"ALMA’s high-resolution observations have unveiled an excess of emission in the millimeter bands of radio-quiet Active Galactic Nuclei (AGN), yet the origin of this emission remains unclear. One proposed explanation is the synchrotron emission produced by accelerated non-thermal electrons within the X-ray hot corona. Such non-thermal population could also be the origin of the Neutrino emission now detected in a very few AGN. Here, we present the variability
and spectral study using high-resolution millimeter ALMA observations of the Seyfert IC4329A assuming the corona millimeter emission model. We study three different variability timescales: yearly, daily, and intra-day. The spectral analysis reveals the evolving millimeter spectrum of the core emission and its constraints on the size and magnetic field strength of the millimeter emitting corona. The observed variability underscores the importance of coordinated quasi-simultaneous observations between ALMA and X-ray observatories to understand all physical processes at work inside the X-ray hot corona."
