Mark Armah

Astrophysics of Galaxies

Identifying AGNs from X-ray detections-I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter

mark-armah

• Mar 1, 2026 • 1 min read

Galaxies: Abundances

Metallicity of active galactic nuclei from ultraviolet and optical emission lines ─ II. Revisiting the C43 metallicity calibration and its implications

o.~l.-dors

• Oct 1, 2025 • 1 min read

Astrophysics - Astrophysics of Galaxies

Spatially resolved gas-phase metallicity in Seyfert galaxies

mark-armah

• Nov 1, 2024 • 1 min read

ISM: Abundances

Chemical abundances in Seyfert galaxies - X. Sulphur abundance estimates

oli-l.-dors

• May 1, 2023 • 1 min read

Galaxies: Abundances

Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity-luminosity relation

mark-armah

• Apr 1, 2023 • 1 min read

Galaxies: Abundances

Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal-poor accretion

jana%C4%B1na-c.-do-nascimento

• Jun 1, 2022 • 1 min read

ISM: Abundances

Chemical abundances in Seyfert galaxies - VII. Direct abundance determination of neon based on optical and infrared emission lines

mark-armah

• Nov 1, 2021 • 1 min read