Date: 12.05.2026

Mateusz Mróz (OAUW,PL)

TBD

Abstract:
Narrow-line Seyfert 1 (NLSy1) galaxies are a subpopulation of active galactic nuclei (AGN) accreting at relatively high rates and known for their peculiar spectral properties, like extreme FeII emission in optical and UV range or relatively narrow Balmer lines. I will cover two NLSy1-focused topics. First, I will present VLT spectropolarimetry of three NLSy1s and show how it can constrain orientation and inner-structure geometry, which is crucial for interpreting unusually short reverberation lags and their implied black hole masses. Secondly, a case study of the TDE candidate in an NLSy1, which shows a double-peaked optical/UV light curve, a low blackbody temperature, and no detected X-ray emission. Targeting NLSy1s in searches for extreme variability, especially with multi-epoch and multi-wavelength spectroscopy, may be an efficient way to grow samples of these rare and peculiar events.