Bibcode
Gómez-Guijarro, Carlos; González-Martín, Omaira; Ramos Almeida, C.; Rodríguez-Espinosa, J. M.; Gallego, Jesús
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 469, Issue 3, p.2720-2736
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8
2017
Citations
19
Refereed citations
18
Description
Several studies of nearby active galactic nuclei (AGNs) have shown that
the soft X-ray emission presents a size and morphology resembling that
of the narrow-line region (NLR) traced by [O III]. Since the NLR is
mainly constituted by gas photoionized by the AGN, it seems logical to
assume that this is also the primary source of the soft X-ray emission.
However, these results are based on individual sources or small samples,
particularly focused on type-2 Seyfert galaxies. Very little has been
said concerning other types of AGNs. The purpose of this work is to
compare the circumnuclear morphologies of soft X-ray and [O III] images
to test whether they match in different optical classes of AGNs. Our
sample is composed of 27 AGNs: 9 type-1 Seyferts, 10 type-2 Seyferts and
8 low-ionization nuclear emission-line regions (LINERs). We find a good
match in 100 per cent of the type-2 Seyferts in our sample. This
correspondence is less frequent in type-1 Seyferts (22 per cent) and it
is not seen in LINERs. The good resemblance in type-2 Seyferts
constitutes evidence for a common physical origin. We argue that the
lack of correspondence in type-1 Seyferts might be due to the line of
sight perpendicular to the accretion disc. Based on the morphologies of
the eight LINERs in our sample, we discard a common origin for the soft
X-ray and [O III] emissions in these objects. Regarding the X-ray
properties, both high column density and hard X-ray luminosity are
associated with matched morphologies.
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