Distribution of the heavy elements throughout the extended narrow-line region of the Seyfert galaxy NGC 7212

Contini, M.; Cracco, V.; Ciroi, S.; Mura, G. La

doi:10.1051/0004-6361/201219184

Cited by 12 publications

(15 citation statements)

References 46 publications

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“…Optical ground-based observations and emission line diagnostics (e.g., BPT diagrams; Baldwin et al 1981), from Congiu et al (2017) (see also Contini et al 2012) suggest that the ionization mechanism for NGC 7212 is a combination of photoionization and shocks, which is qualitatively consistent with our results. Recently, Terao et al (2016) suggests that NGC 7212 is not likely affected by fast shocks based on near-IR observations.…”

Section: Physical Modelssupporting

confidence: 90%

Chandra Observations of NGC 7212: Large-scale Extended Hard X-Ray Emission

Jones

Fabbiano

Elvis

et al. 2020

ApJ

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Recent observations of nearby Compton thick (CT) active galactic nuclei (AGNs) with Chandra have resolved hard (> 3 keV) X-ray emission extending out from the central supermassive black hole to kiloparsec scales, challenging the long-held belief that the characteristic hard X-ray continuum and fluorescent Fe K lines originate in the inner ∼parsec due to the excitation of obscuring material. In this paper we present the results of the most recent Chandra ACIS-S observations of NGC 7212, a CT AGN in a compact group of interacting galaxies, with a total effective exposure of ∼150 ks. We find ∼20% of the observed emission is found outside of the central kiloparsec, with ∼17% associated with the soft X-rays, and ∼3% with hard X-ray continuum and Fe K line. This emission is extended both along the ionization cone and in the cross-cone direction up to ∼3.8 kpc scales. The spectrum of NGC 7212 is best represented by a mixture of thermal and photoionization models that indicate the presence of complex gas interactions. These observations are consistent with what is observed in other CT AGN (e.g., ESO 428−G014, NGC 1068), providing further evidence that this may be a common phenomenon. High-resolution observations of extended CT AGN provide an especially valuable environment for understanding how AGN feedback impacts host galaxies on galactic scales.

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Section: Physical Modelssupporting

confidence: 90%

Chandra Observations of NGC 7212: Large-scale Extended Hard X-Ray Emission

Jones

Fabbiano

Elvis

et al. 2020

ApJ

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“…As observed in nearby Seyferts (e.g. Contini et al 2012;Villar Martín et al 2015;Freitas et al 2018), a radiation-bound photoionization model from the AGN, outflow, jet shocks and young stars and the large amount of gas clouds support the extreme line properties observed in HEGs and the larger covering factors (Hainline et al 2014;Dempsey & Zakamska 2018).…”

Section: Discussionmentioning

confidence: 79%

Hubble Space Telescope Emission-line Images of Nearby 3CR Radio Galaxies: Two Photoionization, Accretion, and Feedback Modes

Baldi

Zaurín

Chiaberge

et al. 2019

ApJ

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We present HST/ACS narrow-band images of a low-z sample of 19 3C radio galaxies to study the Hα and [O III] emissions from the narrow-line region (NLR). Based on nuclear emission line ratios, we divide the sample into High and Low Excitation Galaxies (HEGs and LEGs). We observe different line morphologies, extended line emission on kpc scale, large [O III]/Hα scatter across the galaxies, and a radio-line alignment. In general, HEGs show more prominent emission line properties than LEGs: larger, more disturbed, more luminous, and more massive regions of ionized gas with slightly larger covering factors. We find evidence of correlations between line luminosities and (radio and X-ray) nuclear luminosities. All these results point to a main common origin, the active nucleus, which ionize the surrounding gas. However, the contribution of additional photoionization mechanism (jet shocks and star formation) are needed to account for the different line properties of the two classes.A relationship between the accretion, photoionization and feedback modes emerges from this study. For LEGs (hot-gas accretors), the synchrotron emission from the jet represents the main source of ionizing photons. The lack of cold gas and star formation in their hosts accounts for the moderate ionized-gas masses and sizes. For HEGs (cold-gas accretors), an ionizing continuum from a standard disk and shocks from the powerful jets are the main sources of photoionization, with the contribution from star formation. These components, combined with the large reservoir of cold/dust gas brought from a recent merger, account for the properties of their extended emission-line regions.

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“…Fig. 10 Contini et al, 2012) in a large region within the clouds. The temperatures evaluated in IC 5063 are closer to 10000 K.…”

Section: Gas Properties As a Function Of Velocitymentioning

confidence: 98%

Extended Narrow-Line Region in Seyfert Galaxies

Congiu

Contini

Ciroi

et al. 2017

Front. Astron. Space Sci.

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We present our recent results about the extended narrow-line region (ENLR) of two nearby Seyfert 2 galaxies (IC 5063 and NGC 7212) obtained by modelling the observed line profiles and spectra with composite models (photoionization+shocks) in the different regions surrounding the AGN. Then, we compare the Seyfert 2 ENLRs with the very extended one recently discovered in the narrow-line Seyfert 1 (NLS1) galaxy Mrk 783. We have found several evidences of interaction between the ISM of the galaxies and their radio jets, such as a) the contribution of shocks in ionizing the high velocity gas, b) the complex kinematics showed by the profile of the emission lines, c) the high fragmentation of matter, etc. The results suggest that the ENLR of IC 5063 have a hollow bi-conical shape, with one edge aligned to the galaxy disk, which may cause some kind of dependence on velocity of the ionization parameter. Regarding the Mrk 783 properties, it is found that the extension of the optical emission is almost twice the size of the radio one and it seems due to the AGN activity, although there is contamination by star formation around 12 arcsec from the nucleus. Diagnostic diagrams excluded the contribution of star formation in IC 5063 and NGC 7212, while the shock contribution was used to explain the spectra emitted by their high velocity gas.

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Distribution of the heavy elements throughout the extended narrow-line region of the Seyfert galaxy NGC 7212

Cited by 12 publications

References 46 publications

Chandra Observations of NGC 7212: Large-scale Extended Hard X-Ray Emission

Chandra Observations of NGC 7212: Large-scale Extended Hard X-Ray Emission

Hubble Space Telescope Emission-line Images of Nearby 3CR Radio Galaxies: Two Photoionization, Accretion, and Feedback Modes

Extended Narrow-Line Region in Seyfert Galaxies

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