Gemini NIFS survey of feeding and feedback in nearby active galaxies – IV. Excitation

ABSTRACT The near-infrared spectra of active galactic nuclei (AGN) present emission lines of different atomic and molecular species. The mechanisms involved in the origin of these emission lines in AGN are still not fully understood. We use J- and K-band integral field spectra of six luminous ($43.1\lt \log L_{\rm bol}/({\rm erg\, s^{-1}})\lt 44.4$) Seyfert galaxies (NGC 788, Mrk 607, NGC 3227, NGC 3516, NGC 5506, and NGC 5899) in the local Universe (0.0039 < z < 0.0136) to investigate the gas excitation within the inner 100–300 pc radius of the galaxies at spatial resolutions of a few tens of parsecs. In all galaxies, the H2 emission originates from thermal processes with excitation temperatures in the range 2400–5200 K. In the high-line ratio (HLR) region of the H2/Brγ versus [Fe ii]/Paβ diagnostic diagram, which includes 29 per cent of the spaxels, shocks are the main excitation mechanism, as indicated by the correlation between the line widths and line ratios. In the AGN region of the diagram (64 per cent of the spaxels) the H2 emission is due to the AGN radiation. The [Fe ii] emission is produced by a combination of photoionization by the AGN radiation and shocks in five galaxies and is dominated by photoionization in NGC 788. The [S ix]1.2523 μm coronal emission line is present in all galaxies, and its flux distributions are extended from 80 to 185 pc from the galaxy nuclei, except for NGC 5899, in which this line is detected only in the integrated spectrum.

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Evidence of AGN-driven Outflows in Young Radio Quasars Selected from the Wide-field Infrared Survey Explorer

Proceedings of the International Astronomical Union ◽

10.1017/s1743921314004268 ◽

2013 ◽

Vol 9 (S304) ◽

pp. 347-348

Author(s):

Minjin Kim ◽

Luis C. Ho ◽

Carol J. Lonsdale ◽

Mark Lacy ◽

Andrew W. Blain ◽

...

Keyword(s):

Active Galactic Nuclei ◽

Near Infrared ◽

Galactic Nuclei ◽

Emission Lines ◽

Wide Field ◽

Near Infrared Spectra ◽

Sky Survey ◽

Line Widths ◽

Infrared Survey ◽

Narrow Emission

AbstractWe present near-infrared spectra of young radio quasars selected by cross-correlating the Wide-field Infrared Survey Explorer (WISE) all-sky survey catalog with the radio catalog [Faint Images of the Radio Sky at Twenty cm (FIRST) and NRAO VLA Sky Survey (NVSS)]. The objects have typical redshifts of z ≈ 2 and [O III] luminosities of 107 erg s−1 comparable to those of luminous quasars. The observed flux ratios of narrow emission lines indicate that these objects appear to be powered by active galactic nuclei. The [O III] line is broad, with full width at half maximum ~1300 to 2100 km s−1, significantly larger than that of ordinary quasars. These large line widths might be explained by jet-induced outflows.

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Turbulence/outflows perpendicular to low-power jets in Seyfert galaxies

Proceedings of the International Astronomical Union ◽

10.1017/s1743921320002197 ◽

2019 ◽

Vol 15 (S359) ◽

pp. 464-466

Author(s):

Giacomo Venturi ◽

Alessandro Marconi ◽

Matilde Mingozzi ◽

Giovanni Cresci ◽

Stefano Carniani ◽

...

Keyword(s):

Low Power ◽

Active Galactic Nuclei ◽

Interaction Mechanism ◽

Galactic Nuclei ◽

Seyfert Galaxies ◽

Near Ir ◽

The Galaxy ◽

Line Widths ◽

Integral Field Spectrograph ◽

Integral Field

AbstractWe present recent results from our MAGNUM survey of nearby active galactic nuclei (AGN), which exploits observations from the optical/near-IR integral field spectrograph MUSE at VLT. We detect strongly enhanced line widths in emission line maps of four galaxies perpendicularly to their low-power jets and AGN ionisation cones, indicative of turbulent/outflowing material. The observation of a similar phenomenon in other works suggests that it originates from an interaction mechanism between the jet and the galaxy disc through which it propagates.

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NIR–IFU observations of the merger remnant NGC 34

Proceedings of the International Astronomical Union ◽

10.1017/s1743921320002033 ◽

2019 ◽

Vol 15 (S359) ◽

pp. 355-356

Author(s):

Juliana C. Motter ◽

Rogério Riffel ◽

Tiago V. Ricci ◽

Natacha Z. Dametto ◽

Luis G. Dahmer-Hahn ◽

...

Keyword(s):

Galaxy Evolution ◽

Adaptive Optics ◽

Near Infrared ◽

Galactic Nuclei ◽

Molecular Gas ◽

The Galaxy ◽

Open Issue ◽

Nuclear Regions ◽

Disc Galaxies ◽

Integral Field

AbstractUnderstanding the interplay between the phenomena of active galactic nuclei (AGN) and starbursts remains an open issue in studies of galaxy evolution. The galaxy NGC 34 is the remnant of the merger of two former gas-rich disc galaxies and it also hosts a strong nuclear starburst. In this work, we map the ionized and molecular gas present in the nuclear regions of the galaxy NGC 34 using adaptive optics (AO) assisted near infrared (NIR) integral field unity (IFU) observations. Our main goals are to better constrain the energy source of this object and to use NGC 34 as a laboratory to probe the AGN-starburst connection in the context of galaxy evolution and AGN feeding and feedback processes.

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Gas Motion Mapping for Three Seyfert Galaxies

Open Astronomy ◽

10.1515/astro-2017-0325 ◽

2011 ◽

Vol 20 (3) ◽

Author(s):

A. Smirnova ◽

A. Moiseev ◽

I. Katkov ◽

V. Afanasiev

Keyword(s):

Active Galactic Nuclei ◽

Galactic Nuclei ◽

Seyfert Galaxies ◽

Velocity Fields ◽

Emission Lines ◽

Ionized Gas ◽

Preliminary Results ◽

Fabry Perot ◽

Integral Field Spectrograph ◽

Integral Field

AbstractWe report the preliminary results of a kinematical study of three Seyfert galaxies selected from a sample of nearby active galactic nuclei observed using 3D spectroscopy. The observations were performed at the prime focus of the 6 m telescope of SAO RAS with the integral-field spectrograph MPFS and with a scanning Fabry-Pérot interferometer, installed on the multimode device SCORPIO. Based on these data, the monochromatic maps and velocity fields in different emission lines were constructed. We have detected the nuclear outflow or ionized gas motions associated with a radio jet in all the circumnuclear regions of these galaxies.

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Chemical abundances in Seyfert galaxies – V. The discovery of shocked emission outside the AGN ionization axis

Monthly Notices of the Royal Astronomical Society Letters ◽

10.1093/mnrasl/slaa194 ◽

2020 ◽

Vol 501 (1) ◽

pp. L54-L59

Author(s):

R A Riffel ◽

O L Dors ◽

M Armah ◽

T Storchi-Bergmann ◽

A Feltre ◽

...

Keyword(s):

Electron Temperature ◽

Active Galactic Nuclei ◽

Direct Evidence ◽

Galactic Nuclei ◽

Seyfert Galaxies ◽

Chemical Abundances ◽

Temperature Distributions ◽

Field Unit ◽

Dusty Torus ◽

Integral Field

ABSTRACT We present maps for the electron temperature in the inner kpc of three luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini Multi-Object Spectrograph-integral field unit observations at spatial resolutions of ∼110–280 pc. We study the distributions of electron temperature in active galaxies and find temperatures varying in the range from ∼8000 to $\gtrsim 30\, 000\,$K. Shocks due to gas outflows play an important role in the observed temperature distributions of Mrk 79 and Mrk 348, while standard photoionization models reproduce the derived temperature values for Mrk 607. In Mrk 79 and Mrk 348, we find direct evidence for shock ionization with overall orientation orthogonal to the ionization axis, where shocks can be easily observed as the active galactic nuclei radiation field is shielded by the nuclear dusty torus. This also indicates that even when the ionization cones are narrow, the shocks can be much wider angle.

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Feeding versus feedback in active galactic nuclei from near-infrared integral field spectroscopy – XII. NGC 5548

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stw2263 ◽

2016 ◽

Vol 464 (2) ◽

pp. 1771-1782 ◽

Cited By ~ 14

Author(s):

Astor J. Schönell ◽

Thaisa Storchi-Bergmann ◽

Rogemar A. Riffel ◽

Rogério Riffel

Keyword(s):

Active Galactic Nuclei ◽

Near Infrared ◽

Galactic Nuclei ◽

Integral Field Spectroscopy ◽

Field Spectroscopy ◽

Ngc 5548 ◽

Integral Field

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Identification of AGN in the XMM-Newton X-ray survey of the SMC

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833663 ◽

2019 ◽

Vol 622 ◽

pp. A29 ◽

Cited By ~ 6

Author(s):

Chandreyee Maitra ◽

Frank Haberl ◽

Valentin D. Ivanov ◽

Maria-Rosa L. Cioni ◽

Jacco Th. van Loon

Keyword(s):

Near Infrared ◽

Spectral Characteristics ◽

Selection Criterion ◽

Galactic Nuclei ◽

Seyfert Galaxies ◽

Mid Infrared ◽

X Ray ◽

Stellar Density ◽

Narrow Emission

Context. Finding active galactic nuclei (AGN) behind the Magellanic Clouds (MCs) is difficult because of the high stellar density in these fields. Although the first AGN behind the Small Magellanic Cloud (SMC) were reported in the 1980s, it is only recently that the number of AGN known behind the SMC has increased by several orders of magnitude. Aims. The mid-infrared colour selection technique has proven to be an efficient means of identifying AGN, especially obscured sources. The X-ray regime is complementary in this regard and we use XMM-Newton observations to support the identification of AGN behind the SMC. Methods. We present a catalogue of AGN behind the SMC by correlating an updated X-ray point-source catalogue from our XMM-Newton survey of the SMC with previously identified AGN from the literature as well as a list of candidates obtained from the ALLWISE mid-infrared colour-selection criterion. We studied the properties of the sample with respect to their redshifts, luminosities, and X-ray spectral characteristics. We also identified the near-infrared counterpart of the sources from the VISTA observations. Results. The redshift and luminosity distributions of the sample (where known) indicate that we detect sources ranging from nearby Seyfert galaxies to distant and obscured quasars. The X-ray hardness ratios are compatible with those typically expected for AGN, and the VISTA colours and variability are also consistent with AGN. A positive correlation was observed between the integrated X-ray flux (0.2–12 keV) and the ALLWISE and VISTA magnitudes. We further present a sample of new candidate AGN and candidates for obscured AGN. Together these make an interesting subset for further follow-up studies. An initial spectroscopic follow-up of 6 out of the 81 new candidates showed that all six sources are active galaxies, although two have narrow emission lines.

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