Mark Armah
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ESC

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  • Events
    • Metallicity Calibrations in AGNs: N2O2 and N2S2 Diagnostics
  • Publications
    • Identifying AGNs from X-ray detections-I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
    • Metallicity of active galactic nuclei from ultraviolet and optical emission lines ─ II. Revisiting the C43 metallicity calibration and its implications
    • Spatially resolved gas-phase metallicity in Seyfert galaxies
    • Chemical abundances in Seyfert galaxies - X. Sulphur abundance estimates
    • Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity-luminosity relation
    • Chemical abundances in Seyfert galaxies - IX. Helium abundance estimates
    • Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal-poor accretion
    • Chemical abundances in Seyfert galaxies - VII. Direct abundance determination of neon based on optical and infrared emission lines
    • Chemical abundances in Seyfert galaxies - V. The discovery of shocked emission outside the AGN ionization axis
    • Chemical abundances of Seyfert 2 AGNs - III. Reducing the oxygen abundance discrepancy
    • Chemical abundances of Seyfert 2 AGNs - II. N2 metallicity calibration based on SDSS
    • Chemical abundances of Seyfert 2 AGNs - I. Comparing oxygen abundances from distinct methods using SDSS
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    • Metallicity Calibrations in AGNs: N₂O₂ and N₂S₂ Diagnostics
    • Identifying AGNs from X-ray Detections: Primary Parameter Calibrations
    • Spatially Resolved Gas-Phase Metallicity
    • Oxygen Abundances & The Metallicity-Luminosity Relation
    • Direct Abundance Determination of Neon
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Last updated on Oct 24, 2023

© 2026 Mark Armah. This work is licensed under CC BY NC ND 4.0

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