BAT AGN Spectroscopic Survey – XIX. Type 1 versus type 2 AGN dichotomy from the point of view of ionized outflows
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Archivos
Fecha
2019-11
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Licencia CC
Resumen
We present a detailed study of ionized outflows in a large sample of ∼650 hard X-raydetected
active galactic neuclei (AGNs). Using optical spectroscopy from the BAT AGN
Spectroscopic Survey (BASS), we are able to reveal the faint wings of the [OIII] emission
lines associated with outflows covering, for the first time, an unexplored range of low AGN
bolometric luminosity at low redshift (z ∼0.05).We test if and how the incidence and velocity
of ionized outflow is related to AGN physical parameters: black hole mass (MBH), gas column
density (NH), Eddington ratio (λEdd), [O III], X-ray, and bolometric luminosities. We find a
higher occurrence of ionized outflows in type 1.9 (55 per cent) and type 1 AGNs (46 per cent)
with respect to type 2 AGNs (24 per cent). While outflows in type 2 AGNs are evenly balanced
between blue and red velocity offsets with respect to the [OIII] narrow component, they
are almost exclusively blueshifted in type 1 and type 1.9 AGNs. We observe a significant
dependence between the outflow occurrence and accretion rate, which becomes relevant at
high Eddington ratios [log(λEdd) −1.7]. We interpret such behaviour in the framework
of covering factor-Eddington ratio dependence. We do not find strong trends of the outflow
maximum velocity with AGN physical parameters, as an increase with bolometric luminosity
can be only identified when including samples of AGNs at high luminosity and high redshift
taken from literature.
Notas
Palabras clave
galaxies: active – galaxies: nuclei – quasars: emission lines.
Citación
Monthly Notices of the Royal Astronomical Society Open Access Volume 491, Issue 4, Pages 5867 - 58801 February 2020