The nuclear region of NGC 613 – I. Multiwavelength analysis

Silva, Patrícia da; Menezes, R. B.; Steiner, J. E.

doi:10.1093/mnras/staa007

Cited by 13 publications

(12 citation statements)

References 55 publications

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“…Previous studies detected extended soft X-ray emission around AGNs (e.g. Young et al 2001;Hardcastle & Croston 2005;Bianchi et al 2006;Balmaverde et al 2012;Greene et al 2014;da Silva et al 2020) and, in certain cases, with a spatial correspondence between the extended X-ray emission and the ionization cone, usually revealed by the [O iii]λ5007 emission. The most likely hypothesis to explain the X-ray emission assumes that it is originated in the narrow line region (NLR; e.g.…”

Section: Discussion and Comparison With Previous Studiesmentioning

confidence: 86%

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The highly obscured Seyfert 2 nucleus in NGC 1448 observed with MUSE

Menezes,

da Silva,

Steiner

2021

Preprint

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We present the analysis of an optical data cube of the central region of NGC 1448, obtained with the Multi Unit Spectroscopic Explorer (MUSE). Chandra X-ray data indicate that the active galactic nucleus (AGN) is not located at the apparent stellar nucleus of the galaxy, but at a projected distance of 1.75 ± 0.22 arcsec (139 ± 17 pc). This is probably caused by the high interstellar extinction in the surroundings of the AGN, which corresponds to the true nucleus of the galaxy, as also proposed by previous studies. The morphology and classification of the optical line-emitting regions indicate two ionization cones, around an axis with a position angle of P A cones = −50 • ± 7 • , with emission-line spectra characteristic of Seyfert galaxies. The stellar and gas kinematics are consistent with a stellar and gas rotating disc around the nucleus, with a velocity amplitude of 125 km s −1 . Two probable outflows from the AGN were detected along the region of the two ionization cones. The AGN position does not coincide with the brightest line-emitting region at the centre of NGC 1448. That may be a consequence of the high obscuration from the AGN towards the observer (the AGN is actually Compton thick), mostly caused by a nearly edge-on torus. An additional hypothesis is that the AGN reduced its luminosity, during the last 440 yr, to nearly half of the value in the past. In this case, the brightest line-emitting region corresponds to a "light echo" or a "fossil" of the AGN in the past.

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Section: Discussion and Comparison With Previous Studiesmentioning

confidence: 86%

“…The most likely hypothesis to explain the X-ray emission assumes that it is originated in the narrow line region (NLR; e.g. Young et al 2001;Bianchi et al 2006;Balmaverde et al 2012;da Silva et al 2020) and, therefore, it is also the result of the ionization by the central AGN.…”

Section: Discussion and Comparison With Previous Studiesmentioning

confidence: 99%

The highly obscured Seyfert 2 nucleus in NGC 1448 observed with MUSE

Menezes,

da Silva,

Steiner

2021

Preprint

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“…The feeding mechanism of AGNs, on the other hand, may ★ p.silva2201@gmail.com † roberto.menezes@maua.br ‡ yaherlyn.diaz@postgrado.uv.cl be shown by the presence of circumnuclear features, such as nuclear spirals and nuclear rings (e.g. da Silva et al 2020).…”

Section: Introductionmentioning

confidence: 99%

The nuclear environment of NGC 2442: a Compton-thick low-luminosity AGN

da Silva,

Menezes,

Díaz

et al. 2021

Preprint

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The detailed study of nuclear regions of galaxies is important because it can help understanding the active galactic nucleus (AGN) feedback mechanisms, the connections between the nuclei and their host galaxies, and ultimately the galaxy formation processes. We present the analysis of an optical data cube of the central region of the galaxy NGC 2442, obtained with the integral field unit (IFU) of the Gemini Multi-Object Spectrograph (GMOS). We also performed a multiwavelength analysis, with Chandra data, XMM-Newton and NuSTAR spectra, and Hubble Space Telescope (HST) images. The analysis revealed that the nuclear emission is consistent with a Low Ionization Nuclear Emission-line Region (LINER) associated with a highly obscured compact hard X-ray source, indicating a Compton-thick AGN. The HST image in the F658N filter (H𝛼) reveals an arched structure corresponding to the walls of the ionization cone of the AGN. The gas kinematic pattern and the high gas velocity dispersion values in the same region of the ionization cone suggest an outflow emission. The stellar archaeology results indicate the presence of only old stellar populations (∼ 10 Gyr), with high metallicity (z = 0.02 and 0.05), and the absence of recent star formation in the central region of NGC 2442, which is possibly a consequence of the AGN feedback, associated with the detected outflow, shutting off star formation. NGC 2442 is a late-type galaxy similar to the Milky Way, and comparisons show that the main difference between them is the presence of a low-luminosity AGN.

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“…

In this work, we continue the study of the central region of NGC 613 by da Silva et al (2020), by analysing the stellar and gas kinematics and the stellar archaeology in optical and near-infrared data cubes. The high spatial resolution of the Gemini Multi-Object Spectrograph (GMOS) data cube allowed the detection, using spectral synthesis methods, of an inner circumnuclear ring, with a radius of ∼ 1 arcsec, composed of ∼ 10 9 -yr stellar populations.

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confidence: 99%

The nuclear region of NGC 613 -- II. Kinematics and stellar archaeology

da Silva,

Menezes,

Steiner

2020

Preprint

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In this work, we continue the study of the central region of NGC 613 by da Silva et al. (2020), by analysing the stellar and gas kinematics and the stellar archaeology in optical and near-infrared data cubes. The high spatial resolution of the Gemini Multi-Object Spectrograph (GMOS) data cube allowed the detection, using spectral synthesis methods, of an inner circumnuclear ring, with a radius of ∼ 1 arcsec, composed of ∼ 10 9 -yr stellar populations. Such a ring is located between the nucleus and the circumnuclear ring composed by H ii regions detected in previous works. Besides that, there is a stellar rotation around the nucleus and the rings follow the same direction of rotation with different velocities. The intensity-weighted average stellar velocity dispersion at the centre is 92 ± 3 km s −1 . Three distinct gas outflow components were detected. The direction of the outflow observed with the H α emission line is compatible with the direction of the previously observed radio jet. The direction of one of the outflows detected in the [O iii]λ5007 emission coincides with the axis of the ionization cone. There is no difference regarding the stellar populations and the stellar kinematics along the double stellar emission, probably separated by a dust lane as mentioned in Paper I, confirming that they are part of the same structure.

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The nuclear region of NGC 613 – I. Multiwavelength analysis

Cited by 13 publications

References 55 publications

The highly obscured Seyfert 2 nucleus in NGC 1448 observed with MUSE

The highly obscured Seyfert 2 nucleus in NGC 1448 observed with MUSE

The nuclear environment of NGC 2442: a Compton-thick low-luminosity AGN

The nuclear region of NGC 613 -- II. Kinematics and stellar archaeology

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