Physical Conditions in the Seyfert Galaxy NGC 2992

Allen, M. G.; Dopita, Michael A.; Tsvetanov, Z.; Sutherland, Ralph S.

doi:10.1086/306718

Cited by 72 publications

(105 citation statements)

References 38 publications

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“…Concerning outflows, we cannot provide direct evidence, even though at least two of the objects in our sample (NGC 4388, NGC 2992) have had an outflow component confirmed by several authors (e.g., Veilleux et al 1999b;Márquez et al 1998;Allen et al 1999;Veilleux et al 2001). We are partially limited by the small FOV, but a clearer understanding is expected from our future detailed kinematic modelling.…”

Section: Non-axisymmetric Potentialsmentioning

confidence: 58%

“…The diagrams provide further possibilities for future detailed modelling of the ionisation structure, similar to that performed e.g., by Bennert et al (2006b), or Allen et al (1999) for long-slit spectroscopic data.…”

Section: General Commentsmentioning

confidence: 74%

“…A disturbed dust lane was identified at PA = 15 • by Márquez et al (1998) and at PA = 30 • by Veilleux et al (2001). Multi-component optical emission lines were detected, and the velocity field was suggested to be a superposition of rotation and an outflow (Márquez et al 1998;Allen et al 1999;Veilleux et al 2001). The FOV in OASIS observations enables only one of the emission cones to be imaged, located south-east of the dust lane.…”

Section: Ngc 2992mentioning

confidence: 94%

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OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies

Stoklasová

Ferruit

Emsellem

et al. 2009

A&A

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Aims. We examine the physical conditions of ionised gas in the central kiloparsec(s) of nearby Seyfert galaxies. Our aim is a detailed two-dimensional mapping of optical spectroscopic properties, searching for features in the emission structure and in gas kinematics which would be common to all the active galactic nuclei (AGN) or their class, and which would help us to understand the origin and nature of the circumnuclear gas, and its role in the AGN. Methods. We map narrow-line regions (NLRs) of 11 nearby Seyfert 2 galaxies with the optical integral-field spectrograph OASIS mounted at CFHT. We model emission-line profiles of 5 forbidden-line doublets and 2 Balmer lines, correcting for the underlying stellar absorption by reconstructing stellar spectra with synthetic evolutionary stellar population models. Results. For each of the 11 targets, we present 2D maps of surface brightness in the observed emission lines, diagnostic line intensity ratios, gas kinematics (mean line-of-sight velocity and velocity dispersion), electron density, and interstellar reddening, and we plot spatially resolved spectral-diagnostic diagrams. The stellar data are represented by maps of mean line-of-sight (LOS) velocities and of the relative mass fractions of the young stellar populations. The gas velocity fields in 80% of the sample exhibit twisted Sshaped isovelocity contours, which are signatures of non-circular orbits and indicate non-axisymmetric gravitational potentials, gas motions out of the galactic plane, or possible outflows and inflows. Based on the kinematic measurements, we identified a possible nuclear ring or radial gas flow in NGC 262 (Mrk 348), not reported before. Eight of the eleven observed objects exhibit strongly asymmetric or multi-component emission-line profiles, in most cases confined to an elongated region passing through the galactic centre, perpendicular to the major axis of emission.

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Section: Non-axisymmetric Potentialsmentioning

confidence: 58%

Section: General Commentsmentioning

confidence: 74%

Section: Ngc 2992mentioning

confidence: 94%

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OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies

Stoklasová

Ferruit

Emsellem

et al. 2009

A&A

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“…The high spectral resolution observations (4.9 Å: 3440-5579 Å, 11.9 Å: 5840-9725 Å) of narrow line regions in NGC 2992 of Allen et al (1999) show at most positions a double component line profile. One component of the double peaked lines follows the galactic rotation curve, while the other is identified as a wind that is expanding out of the plane of the galaxy with a velocity of up to 200 km s −1 .…”

Section: Measured [O Iii] and Hα Lines Atmentioning

confidence: 93%

Adaptive optics near infrared integral field spectroscopy of NGC 2992

Friedrich¹,

Davies²,

Hicks³

et al. 2010

A&A

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Aims. NGC 2992 is an intermediate Seyfert 1 galaxy showing outflows on kilo parsec scales which might be due either to AGN or starburst activity. We therefore aim at investigating its central region for a putative starburst in the past and its connection to the AGN and the outflows. Methods. Observations were performed with the adaptive optics near infrared integral field spectrograph SINFONI on the VLT, complemented by longslit observations with ISAAC on the VLT, as well as N-and Q-band data from the Spitzer archive. The spatial and spectral resolutions of the SINFONI data are 50 pc and 83 km s −1 , respectively. The field of view of 3 × 3 corresponds to 450 pc × 450 pc. Brγ equivalent width and line fluxes from PAHs were compared to stellar population models to constrain the age of the putative recent star formation. A simple geometric model of two mutually inclined disks and an additional cone to describe an outflow was developed to explain the observed complex velocity field in H 2 1-0S(1). Results. The morphologies of the Brγ and the stellar continuum are different suggesting that at least part of the Brγ emission comes from the AGN. This is confirmed by PAH emission lines at 6.2 μm and 11.2 μm and the strength of the silicon absorption feature at 9.7 μm, which point to dominant AGN activity with a relatively minor starburst contribution. We find a starburst age of 40-50 Myr from Brγ line diagnostics and the radio continuum; ongoing star formation can be excluded. Both the energetics and the timescales indicate that the outflows are driven by the AGN rather than the starburst. The complex velocity field observed in H 2 1-0S(1) in the central 450 pc can be explained by the superposition of the galaxy rotation and an outflow.

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“…Comparisons of these line ratios and [O III]/Hβ, used as diagnostics of the energy source (as in the BPT/VO87 diagrams; Baldwin, Phillips & Terlevich 1981;Veilleux & Osterbrock 1987), would misidentify a starburst galaxy with shocks as a LINER or composite galaxy (e.g. Armus et al 1989;Veilleux et al 1995;Martin 1997;Dopita et al 1997;Kim et al 1998;Allen et al 1999;Veilleux et al 1999;Sharp & Bland-Hawthorn 2010;Rich et al 2010Rich et al , 2011Rich et al , 2014. Measurements that rely on emission line fluxes or ratios, such as star formation rate and metallicity, can also be affected unless shocks are identified and removed from the calculation.…”

Section: Introductionmentioning

confidence: 99%

Shocked gas in IRAS F17207-0014: ISM collisions and outflows

Medling

Vivian

Kewley

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We combine optical and near-infrared AO-assisted integral field observations of the merging ULIRG IRAS F17207-0014 from the Wide-Field Spectrograph (WiFeS) and Keck/OSIRIS. The optical emission line ratios [N II]/Hα, [S II]/Hα, and [O I]/Hα reveal a mixing sequence of shocks present throughout the galaxy, with the strongest contributions coming from large radii (up to 100% at ∼5 kpc in some directions), suggesting galactic-scale winds. The nearinfrared observations, which have approximately 30 times higher spatial resolution, show that two sorts of shocks are present in the vicinity of the merging nuclei: low-level shocks distributed throughout our field-of-view evidenced by an H 2 /Brγ line ratio of ∼0.6-4, and strong collimated shocks with a high H 2 /Brγ line ratio of ∼4-8, extending south from the two nuclear disks approximately 400 pc (∼0. ′′ 5). Our data suggest that the diffuse shocks are caused by the collision of the interstellar media associated with the two progenitor galaxies and the strong shocks trace the base of a collimated outflow coming from the nucleus of one of the two disks.

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Physical Conditions in the Seyfert Galaxy NGC 2992

Cited by 72 publications

References 38 publications

OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies

OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies

Adaptive optics near infrared integral field spectroscopy of NGC 2992

Shocked gas in IRAS F17207-0014: ISM collisions and outflows

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