Comparing X-Ray Emission Line Fluxes of NGC 5548 to NGC 1068

The Unification Model of Active galactic nucleus (AGN) suggests that all AGN galaxies should exhibit similar line ratios in their spectra. NGC 5548, a Seyfert I, underwent obscuration—similar to naturally obscured Seyfert II galaxies—due to an outflowing accretion wind, resulting in absorption. As p...

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Bibliographic Details
Published inResearch notes of the AAS Vol. 9; no. 8; pp. 220 - 219
Main Authors Patel, Divya, Dehghanian, Maryam, Ferland, Gary
Format Journal Article
LanguageEnglish
Published The American Astronomical Society 20.08.2025
Subjects
Active galactic nuclei
Emission line galaxies
X-ray active galactic nuclei
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Summary:The Unification Model of Active galactic nucleus (AGN) suggests that all AGN galaxies should exhibit similar line ratios in their spectra. NGC 5548, a Seyfert I, underwent obscuration—similar to naturally obscured Seyfert II galaxies—due to an outflowing accretion wind, resulting in absorption. As per the Model, a Seyfert I and a Seyfert II should show similar flux ratios during their respective obscuration states. In this note, we present a comparison of emission fluxes between NGC 5548 and NGC 1068, a Seyfert II. We present the CLOUDY prediction of NGC 5548, which underpredicts the line ratios compared to observations, likely due to spectral energy distribution choices. The differing observed line ratios of NGC 5548 and NGC 1068 suggest additional unknown factors in the unification model.
Bibliography:AAS68171
Galaxies and Cosmology
ISSN:2515-5172
2515-5172
DOI:10.3847/2515-5172/adfc47