M. Armah

activity

20192026

most citedChemical abundances of Seyfert 2 AGNs-III. Reducing the oxygen abundance discrepancy

60 citations · 274 across the 13 of their papers we have counts for

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astro-ph.GA2026

Identifying AGNs from X-ray detections $-$ II: Metallicity calibrations for the $N_{2} O_{2}$ and $N_{2} S_{2}$ diagnostics

Mark Armah, O. L. Dors, Rogério Riffel +4

Emission-line ratios from ions with nearly identical ionization potentials offer a robust solution to the degeneracies inherent to traditional active galactic nuclei (AGNs) metalli…

astro-ph.GA2026

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

Mark Armah, O. L. Dors, Rogério Riffel +4

We present the first semi-empirical strong-line calibrations to determine metallicity in Active Galactic Nuclei (AGNs) that use the directly observable X-ray luminosity (Lx) instea…

Identifying AGNs from X-ray detections−II: Metallicity calibrations for the N2​O2​ and N2​S2​ diagnostics

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

Identifying AGNs from X-ray detections $-$ II: Metallicity calibrations for the $N_{2} O_{2}$ and $N_{2} S_{2}$ diagnostics