SIMBAD references

2023ApJ...945...59L - Astrophys. J., 945, 59 (2023/March-1)

[O III] 5007 Å Emission Line Width as a Surrogate for σ in Type 1 AGNs?

LE H.A.N., XUE Y., LIN X. and WANG Y.

Abstract (from CDS):

We present a study of the relation between the [O III] 5007 Å emission line width (σ[OIII]) and stellar velocity dispersion (σ*), utilizing a sample of 740 type 1 active galactic nuclei (AGNs) with high-quality spectra at redshift z < 1.0. We find the broad correlation between the core component of the [O III] emission line width (${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$) and σ* with a scatter of 0.11 dex for the low redshift (z < 0.1) sample; for redshift (0.3 < z < 1.0) AGNs, the scatter is larger, being 0.16 dex. We also find that the Eddington ratio (Lbol/LEdd) may play an important role in the discrepancies between ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ and σ*. As the Lbol/LEdd increases, ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ tends to be larger than σ*. By classifying our local sample with different minor-to-major axis ratios, we find that σ* is larger than ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ for those edge-on spiral galaxies. In addition, we also find that the effects of outflow strength properties such as maximum outflow velocity (${V}_{\max }$) and the broader component of the [O III] emission line width and line shift (σ[OIII,out] and V[OIII,out]) may play a major role in the discrepancies between ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ and σ*. The discrepancies between ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ and σ* are larger when ${V}_{\max }$, V[OIII,out], and σ[OIII,out] increase. Our results show that the outflow strengths may have significant effects on the differences between narrow-line region gas and stellar kinematics in AGNs. We suggest that caution should be taken when using ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ as a surrogate for σ*. In addition, the substitute of ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$ for σ* could be used only for low luminosity AGNs.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galaxies - Emission line galaxies - Galaxy kinematics

Simbad objects: 71

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2023ApJ...945...59L and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact