Special issues No. 2,
Pages: 57-58,
https://doi.org/10.69646/15scslsa35
XV Serbian Conference on Spectral Line Shapes in Astrophysics
Published by: Astronomical Observatory Belgrade

Double-peaked emission lines are observed in a small fraction of active galactic nuclei (AGN) and offer a means to determine key properties of the line-emitting region, known as the broad-line region (BLR). Until now, studies of double-peaked emitters (DPEs) have focused almost exclusively on the Balmer lines Hβ and Hα, while investigations of double-peaked lines in the UV or near-infrared remain scarce. Notably, we recently reported – for the first time – broad double-peaked emission profiles in the near-infrared CaII triplet for individual sources, namely NGC1566 and NGC4593. These detections represent the first of their kind to date. The profiles enabled us to link the kinematics of the CaII-emitting phase of the BLR to those of a rotating relativistic disk, largely unaffected by internal turbulence, thus allowing a more direct interpretation of the underlying BLR dynamics. In thistalk, we summarizeourrecentfindingsanddiscuss thepotentialofCaII emission profiles as a powerful diagnostic tool for probing the kinematics of the BLR.