Exploring the AGN-Merger Connection in Arp 245 I: Nuclear Star Formation and Gas Outflow in NGC 2992

Abstract

Galaxy mergers are central to our understanding of galaxy formation, especially within the context of hierarchical models. Besides having a large impact on the star formation history, mergers are also able to influence gas motions at the centre of galaxies and trigger an Active Galactic Nucleus (AGN). In this paper, we present a case study of the Seyfert galaxy NGC 2992, which together with NGC 2993 forms the early-stage merger system Arp 245. Using Gemini Multi-Object Spectrograph (GMOS) integral field unit (IFU) data from the inner 1.1 kpc of the galaxy we were able to spatially resolve the stellar populations, the ionisation mechanism and kinematics of ionised gas. From full spectral synthesis, we found that the stellar population is primarily composed by old metal-rich stars (t $\ge$ 1.4 Gyr, $Z\ge 2.0$\zsun), with a contribution of at most 30 per cent of the light from a young and metal-poor population (t $\le$ 100 Myr, $Z\le 1.0$\zsun). We detect \halpha and \hbeta emission from the Broad Line Region (BLR) with a Full Width at Half Maximum (FWHM) of $\sim$ 2000\kms. The Narrow Line Region (NLR) kinematics presents two main components: one from gas orbiting the galaxy disk and a blueshifted (velocity $\approx$ -200\kms) outflow, possibly correlated with the radio emission, with mass outflow rate of $\sim$ 2 M${}_{\odot }$ yr${}^{-1}$ and a kinematic power of $\sim$ 2 $\times 10^{40}$ erg s${}^{-1}$ (\Eout/\Lbol $\approx$ 0.2 per cent). We also show even though the main ionisation mechanism is the AGN radiation, ionisation by young stars and shocks may also contribute to the emission line ratios presented in the innermost region of the galaxy.

20 pages, 13 Figs, Accepted for publication to the MNRAS

References in corpus (39)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Cosmic Star Formation History
• The Host Galaxies and Classification of Active Galactic Nuclei
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• The MAPPINGS III Library of Fast Radiative Shock Models
• The MUSE second-generation VLT instrument
• The Luminosity Function of X-ray Selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift
• The Current Status of Galaxy Formation
• Galaxy pairs in the Sloan Digital Sky Survey - IX: Merger-induced AGN activity as traced by the Wide-field Infrared Survey Explorer
• The Metallicity of Galaxy Disks: Infall versus Outflow
• Kinematics of the Local Universe XIII. 21-cm line measurements of 452 galaxies with the Nançay radiotelescope, JHK Tully-Fisher relation and preliminary maps of the peculiar velocity field
• Merging and Clustering of the Swift BAT AGN Sample
• Firefly (Fitting IteRativEly For Likelihood analYsis): a full spectral fitting code
• Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting
• Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy
• IFU observations of luminous type II AGN - I. Evidence for ubiquitous winds
• AGN-Starburst connection in NGC7582: Gemini near-infrared spectrograph integral field unit observations
• Triggering Active Galactic Nuclei in Hierarchical Galaxy Formation: Disk instability vs. Interactions
• Sizes and Kinematics of Extended Narrow-Line Regions in Luminous Obscured AGN Selected by Broadband Images
• Starburst-AGN mixing: II. Optically-selected active galaxies
• The complex gas kinematics in the nucleus of the Seyfert 2 galaxy NGC 1386: rotation, outflows and inflows
• Constraints on the Broad Line Region Properties and Extinction in Local Seyferts
• Dissecting Galaxies: Separating Star Formation, Shock Excitation and AGN Activity in the Central Region of NGC 613
• Feedback from Mass Outflows in Nearby Active Galactic Nuclei. II. Outflows in the Narrow-Line Region of NGC 4151
• Comparison of Stellar Population Model Predictions Using Optical and Infrared Spectroscopy
• 2D velocity fields of simulated interacting disc galaxies
• Jet-ISM Interaction in the Radio Galaxy 3C293: Jet-driven Shocks Heat ISM to Power X-ray and Molecular H2 emission
• Abundance ratios and IMF slope in the dwarf elliptical galaxy NGC~1396 with MUSE
• The nuclear and extended infrared emission of the Seyfert galaxy NGC 2992 and the interacting system Arp 245
• The evolution of the metallicity gradient and the star formation efficiency in disc galaxies
• Recovering stellar population parameters via different population models and stellar libraries
• CHANG-ES VIII: Uncovering Hidden AGN Activity in Radio Polarization
• Deep Spectroscopy of the $M_V\sim -14.8$ Host Galaxy of a Tidal Disruption Flare in A1795
• The H$\alpha$ kinematics of interacting galaxies in 12 compact groups
• Impact of an AGN featureless continuum on estimation of stellar population properties
• Short-Timescale monitoring of the X-ray, UV and broad double-peak emission line of the nucleus of NGC 1097
• Gas inflows towards the nucleus of NGC1358
• Major Mergers Host the Most Luminous Red Quasars at z ~ 2: A Hubble Space Telescope WFC3/IR Study
• Stellar population gradients in Seyfert 2 galaxies

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• GATOS XI : Excess dust heating in the Narrow Line Regions of nearby AGN revealed with JWST/MIRI
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