Spatially Resolved [O iii ] Emission Line Kinematics of Reverberation-mapped Active Galactic Nuclei with the Keck Cosmic Web Imager

Le résumé fourni par la source

Abstract We present optical integral-field spectroscopic data of ten nearby (0.02 ≤ z ≤ 0.05) Seyfert 1 galaxies taken with the Keck Cosmic Web Imager. We map the spatially resolved kinematics of the [O iii ] gas and stars, and investigate the alignments between their global kinematic position angles (PAs). Large-scale gas motions are primarily dominated by rotation and are kinematically aligned with the stars (ΔPA ≤ 30°). However, eight galaxies exhibit nonrotational kinematic signatures (e.g., kinematic twists, possible outflows) in their ionized gas velocity fields near the nucleus. We compare aperture-wide measurements of the gas and stellar velocity dispersions ( σ gas and σ ⋆ ) to test the use of the width of the [O iii ] line core as a surrogate for σ ⋆ . Direct comparisons between σ gas and σ ⋆ show that σ gas tends to underestimate σ ⋆ , and thus is not a reliable tracer of σ ⋆ for our selected galaxies. We measure the extent of the narrow-line region (NLR) using several definitions, resulting in sizes of ∼0.1–10 kpc. For a given [O iii ] luminosity, our NLR sizes derived from the [O iii ]/H β flux ratio or an [O iii ] isophotal radius are an order of magnitude larger than those measured from past imaging data.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.