Program: GS-2025A-Q-139

Active galactic nuclei (AGNs) Type-I spectra often exhibit broad emission lines, with a subset displaying double-peaked profiles indicative of a broad line region (BLR) disk-like structure. Recent observations in the near-infrared (NIR) have confirmed double-peaked emission lines in AGNs like III Zw 002, shedding light on BLR geometry and kinematics. We aims to explore the periphery of AGN accretion disks using NIR emission lines and estimate accretion disk properties, including inclination and radial extension, and study the variations of this special class of AGNs along the quasar main sequence. We request GNIRS and FLAMINGOS2 long-slit spectroscopy for 15 double-peak AGN candidates which have archival SDSS spectroscopy and are suitable for 2025A semester. Through this proposal we will procure the NIR spectra for our targets for the first time and complement them with existing optical spectroscopy. This comprehensive approach is crucial for deciphering the complex interplay between accretion disk geometry, kinematics of the disk and the BLR, and the central supermassive black hole environment, contributing to a deeper understanding of AGN phenomena. These new observations will allow us to constrain the black hole masses and inclination, and put constraints on the outer edge of the accretion disks in this fascinating class of AGNs spanning across both hemispheres.