Get started
Author

Mark Armah

Observed names: Armah, Mark, M Armah
ORCID: 0000-0002-9746-3938
Observed ORCID: 0000-0002-9746-3938
OpenAlex ID: A5004496511
Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
2020 · O L Dors, R Maiolino, et al. · Monthly Notices of the Royal Astronomical Society · 64
PDF
Chemical abundances of Seyfert 2 AGNs – II. N2 metallicity calibration based on SDSS
2020 · S P Carvalho, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society · 58
PDF
Chemical abundances of Seyfert 2 AGNs – I. Comparing oxygen abundances from distinct methods using SDSS
2019 · O L Dors, P Freitas-Lemes, et al. · Monthly Notices of the Royal Astronomical Society · 46
PDF
Chemical abundances in Seyfert galaxies – V. The discovery of shocked emission outside the AGN ionization axis
2020 · R A Riffel, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society Letters · 44
PDF
Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal-poor accretion
2022 · Janaína C do Nascimento, Oli L Dors, et al. · Monthly Notices of the Royal Astronomical Society · 27
PDF
Chemical abundances in Seyfert galaxies – IX. Helium abundance estimates
2022 · O L Dors, M Valerdi, et al. · Monthly Notices of the Royal Astronomical Society · 25
PDF
Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation
2023 · Mark Armah, Rogério Riffel, et al. · Monthly Notices of the Royal Astronomical Society · 22
PDF
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines
2021 · Mark Armah, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society · 15
PDF
Chemical abundances in Seyfert galaxies – X. Sulphur abundance estimates
2023 · Oli L Dors, M Valerdi, et al. · Monthly Notices of the Royal Astronomical Society · 14
PDF
Spatially–resolved gas-phase metallicity in Seyfert galaxies
2024 · Mark Armah, Rogério Riffel, et al. · Monthly Notices of the Royal Astronomical Society · 6
Metallicity of Active Galactic Nuclei from ultraviolet and optical emission lines – II. Revisiting the C43 metallicity calibration and its implications
2025 · O L Dors, C B Oliveira, et al. · Monthly Notices of the Royal Astronomical Society · 4
PDF
Identifying AGNs from X-ray detections – I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
2026 · Mark Armah, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society · 1
An Empirical Temperature Relation for Chemical Abundances in AGN
2026 · S R Flury, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society
Identifying AGNs from X-ray detections – II. Metallicity calibrations for the N2O2 and N2S2 diagnostics
2026 · Mark Armah, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society
Correction to: Identifying AGNs from X-ray detections – I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
2026 · Mark Armah, O L Dors, et al. · Monthly Notices of the Royal Astronomical Society
Cosmic evolution of the helium and oxygen abundances in type 2 active galactic nuclei: helium-loud AGNs
2026 · O L Dors, M Armah, et al. · Monthly Notices of the Royal Astronomical Society
Identifying AGNs from X-ray detections-I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
2026 · Armah, Mark, Dors, O. L., et al. · arXiv (Cornell University)
PDF
Works count: 18
Citation count: 326
H-index: 9
I10-index: 9
Year
Topic
Type