SIMBAD references

2017MNRAS.469.2720G - Mon. Not. R. Astron. Soc., 469, 2720-2736 (2017/August-2)

A comparison between the soft X-ray and [O III] morphologies of active galactic nuclei.

GOMEZ-GUIJARRO C., GONZALEZ-MARTIN O., RAMOS ALMEIDA C., RODRIGUEZ-ESPINOSA J.M. and GALLEGO J.

Abstract (from CDS):

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.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert - X-rays: galaxies - X-rays: galaxies

Simbad objects: 36

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2019.10.21-13:32:22

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