Stellar populations in local AGNs: evidence for enhanced star formation in the inner 100pc

Abstract

In modern models and simulations of galactic evolution, the star formation in massive galaxies is regulated by an ad hoc active galactic nuclei (AGN) feedback process. However, the physics and the extension of such effects on the star formation history of galaxies is matter of vivid debate. In order to shed some light in the AGN effects over the star formation, we analyzed the inner 500$\times$500pc of a sample of 14 Seyfert galaxies using GMOS and MUSE integral field spectroscopy. We fitted the continuum spectra in order to derive stellar age, metallicity, velocity and velocity dispersion maps in each source. After stacking our sample and averaging their properties, we found that the contribution of young SP, as well as that of AGN featureless continuum both peak at the nucleus. The fraction of intermediate-age SPs is smaller in the nucleus if compared to outer regions, and the contribution of old SPs vary very little within our field of view (FoV). We also found no variation of velocity dispersion or metallicity within our FoV. Lastly, we detected an increase in the dust reddening towards the center of the galaxies. These results lead us to conclude that AGN phenomenon is usually related to a recent star formation episode in the circumnuclear region.

18 pages, 17 figures. Accepted for publication at MNRAS

References in corpus (69)

• Stellar population synthesis at the resolution of 2003
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• The Host Galaxies of AGN
• Cosmic Star Formation History
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• UV Star Formation Rates in the Local Universe
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• How Do Massive Black Holes Get Their Gas?
• The UV-optical Galaxy Color-Magnitude Diagram I: Basic Properties
• A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
• The 105 month Swift-BAT all-sky hard X-ray survey
• Evolutionary Stellar Population Synthesis at High Spectral Resolution: Optical Wavelengths
• The Ultraviolet-Optical Color-Magnitude Diagram III: Constraints on Evolution from the Blue to Red Sequence
• The star formation history of Seyfert 2 nuclei
• The Luminosity Function of X-ray Selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift
• Relativistic jet feedback III: feedback on gas disks
• Unification of the Fundamental Plane and Super-Massive Black Holes Masses
• Resolving galaxies in time and space: I: Applying STARLIGHT to CALIFA data cubes
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• SDSS-IV MaNGA: Spatially resolved star formation histories in galaxies as a function of galaxy mass and type
• The LABOCA survey of the Extended Chandra Deep Field South: Two modes of star formation in AGN hosts?
• Resolving galaxies in time and space: II: Uncertainties in the spectral synthesis of datacubes
• Circumnuclear stellar population, morphology and environment of Seyfert 2 galaxies: an evolutionary scenario
• AGN Flickering and Chaotic Accretion
• The MUSE Atlas of Disks (MAD): Resolving Star Formation Rates and Gas Metallicities on < 100pc Scales
• Circumnuclear Multi-phase Gas in the Circinus Galaxy II: The Molecular and Atomic Obscuring Structures Revealed with ALMA
• Probing the near infrared stellar population of Seyfert galaxies
• The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728
• The mean star formation rates of unobscured QSOs: searching for evidence of suppressed or enhanced star formation
• Galaxies hosting an AGN: a view from the CALIFA survey
• The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN
• P-MaNGA: Full spectral fitting and stellar population maps from prototype observations
• The star formation rates of active galactic nuclei host galaxies
• Dust emission in early-type galaxies: The mid-infrared view
• On the relation of optical obscuration and X-ray absorption in Seyfert galaxies
• AGN Feedback Compared: Jets versus Radiation
• Quenching star formation: insights from the local main sequence
• The inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey
• The frequency of nuclear star-formation in Seyfert 2 galaxies
• Feeding and feedback in the active nucleus of Mrk 1157 probed with Gemini Near-Infrared Integral-Field Spectrograph
• 2D mapping of young stars in the inner 180 pc of NGC 1068: correlation with molecular gas ring and stellar kinematics
• Do AGN outflows quench or enhance star formation?
• Intermediate age stars as origin of the low velocity dispersion nuclear ring in Mrk1066
• Intermediate-age Stars as Origin of Low Stellar velocity Dispersion Nuclear Rings: the case of Mrk 1157
• Outflows in the Narrow Line Region of Bright Seyfert Galaxies - I: GMOS-IFU Data
• Young ages and other intriguing properties of massive compact galaxies in the Local Universe
• Comparing six evolutionary population synthesis models through spectral synthesis on galaxies
• The first 62 AGN observed with SDSS-IV MaNGA - II: resolved stellar populations
• Determining star-formation rates in Active Galactic Nuclei hosts via stellar population synthesis
• Probing the Active Galactic Nuclei Unified Model Torus Properties in Seyfert Galaxies
• Abundance ratios and IMF slope in the dwarf elliptical galaxy NGC~1396 with MUSE
• Binary black holes and tori in AGN II. Can stellar winds constitute a dusty torus?
• Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: I - Stellar kinematics
• Resolved Spectroscopy of the Narrow-Line Region in NGC 1068. I. The Nature of the Continuum Emission
• Keck Imaging of the Globular Cluster Systems in the Early--type Galaxies NGC 1052 and NGC 7332
• Feedback by AGN Jets and Wide-Angle Winds on a Galactic Scale
• Deep Spectroscopy of the $M_V\sim -14.8$ Host Galaxy of a Tidal Disruption Flare in A1795
• Probing Evolutionary Population Synthesis Models in the Near Infrared with Early Type Galaxies
• A treatment procedure for GMOS/IFU data cubes: application to NGC 2835
• Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: II -The sample and surface mass density profiles
• Outflows, Inflows and Young Stars in the inner 200 pc of the Seyfert galaxy NGC 2110
• Nuclear and Extended Spectra of NGC 1068 - II: Near-Infrared Stellar Population Synthesis
• A panchromatic spatially resolved study of the inner 500 pc of NGC 1052 - I: Stellar population
• LLAMA: Nuclear stellar properties of Swift BAT AGN and matched inactive galaxies
• Stellar Populations of a Sample of Optically Selected AGN-host Dwarf Galaxies
• Stellar population properties for a sample of hard X-ray AGNs
• The impact of low luminosity AGN on their host galaxies: A radio and optical investigation of the kpc-scale outflow in MaNGA 1-166919

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• Infrared Spectral Energy Distribution and Variability of Active Galactic Nuclei: Clues to the Structure of Circumnuclear Material
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• Star formation efficiency and AGN feedback in narrow-line Seyfert 1 galaxies with fast X-ray nuclear winds
• NIHAO XXVIII: Collateral effects of AGN on dark matter concentration and stellar kinematics
• HELLO project: High-$z$ Evolution of Large and Luminous Objects
• Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies
• Digging deeper into NGC\,6868 I: stellar population
• Extragalactic globular cluster near-infrared spectroscopy: I. Integrated near-infrared spectra of Centaurus A/NGC 5128
• Stellar populations from H-band VLT spectroscopy in a sample of seven active galaxies