Book contents
- Frontmatter
- Contents
- Participants
- Preface
- Violent Star Formation in 30 Doradus
- The Initial Mass Function of the Center of 30 Doradus
- The Nature and Kinematics of the Emission Nebulae in the Cyg OBI Supershell
- Asymmetry in the Vertical Distribution of Giant Molecular Clouds in the Carina Arm
- Supersonic Motions in Giant HII Regions
- A Kinematical Study of NGC 604
- UV Spectroscopy of Giant Extragalactic HII Regions: the Case of NGC 604
- Evolution of GEHRs: The Effects Caused by Champagne Flows
- Bursts of Star Formation in Central Disks of Galaxies
- Violent Star Formation
- Superassociations as Star Complexes with Violent Star Formation
- Violent Star Formation Driven by Shock-Shock Collisions
- The Search for Hierarchical Structure inside M31 Superassociations
- A Stochastic PSF Model: Smooth Spirals in Differentially Rotating Disks
- Spatiotemporal Pattern Driven by a Self-Regulating Mechanism of Star Formation
- Detection of an Age Gradient along the z-Axis in a Star-Forming Region
- Abundances of HII Regions and the Chemical Evolution of Galaxies
- Galaxy Properties in Different Environments: Star Formation in Bulges of Late-Type Spirals
- Star Formation in Galaxies in the Bootes Void
- Physical Properties of Giant Extragalactic HII Regions
- The Giant HII Region NGC 2363
- Photometric Diagrams of NGC 2366
- Spectroscopical Imaging of Star-Forming Regions
- A Study on the HII Regions of NGC 4449
- Metallicity Effects on the Properties of Very Young Star Clusters
- The Prototype Starburst Galaxy NGC 7714: Physical Conditions of the Gas and the Stellar Populations
- Tracing Violent Star Formation: HI Observations of Nearby Galaxies
- Massive Star Formation and Supergiant Shells in the Irregular Galaxy NGC 55
- Galactic Supershells
- Violent Star Formation in Dwarf Irregular Galaxies
- Very Metal-Poor Galaxies and the Primordial Helium Abundance
- Implications from HI Composition and Lyα Emission of HII Galaxies
- The IR- and X-Radiation of the Starburst Dwarf Galaxy UGCA 86
- High-Resolution CCD Photometry of HII Galaxies
- Formation of Narrow Hell λ4686 Emission in HII Galaxies: Link with X-Ray Emission
- Environmental Effects in Star-Forming Dwarf Galaxies
- Theory of Starburst and Ultraluminous Galaxies
- Colliding Galaxies, Shocked Gas, and Violent Star Formation
- Violent Star Formation in Merger Remnants
- UV Variability of IRAS 13224-3809
- Star Formation in Polar-Ring Galaxies
- Infrared Spectroscopy of IR-Luminous Galaxies
- Application of the Multiphase Model to the Galactic Bulge
- Stellar Populations and Population Gradients in Spiral Bulges
- Implications of Galaxy Alignment for the Galaxy Formation Problem
- Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217
- How a Dust Concentration Mimics Dynamical Signatures around the Nucleus of NGC 7331
- UGC 5101: An Ultraluminous IRAS Galaxy with Circumnuclear Star Formation
- The Stellar Content of Nearby and Distant Starbursts
- WR Stars in the Giant HII Region NGC 4236III
- Consequences of High Mass Loss Rates on Wolf-Rayet Populations in Starbursts
- Optical and Ultraviolet Morphology of the Starburst Regions in Wolf-Rayet Galaxies
- The Starburst Nucleus of M83
- Spectrophotometry of Haro Starburst Galaxies
- Starbursts in the Irregular Galaxy VV 523
- Long-Slit Spectroscopy of the Central Regions of Starburst Galaxies Henize 2-10 and Markarian 52
- Star Formation in Active Galactic Nuclei: the Cases of NGC 5135, NGC 6221 and NGC 7130
- Metallicity Effects on Starburst
- From 30 Doradus to QSOs
- Distance Indicators to Low-Luminosity AGN
- Broad- and Narrow-Band Imaging of the CfA Seyfert Sample
- Type Transitions in Starburst-Powered AGN
- Stellar Ionization of Low-Luminosity Active Galactic Nuclei
- Line Profiles in Compact Supernova Remnants and Active Galactic Nuclei
- Composite Galactic Nuclei
- The Nature and Origin of X-Ray Emission in Active Galaxies
- Starbursts and Compact Supernova Remnants
- Broad-Band and Line Emission from Fast Radiative Shocks in Dense Media
- Study of the Stellar Populations in AGN
- Bidimensional Spectroscopy of Seyfert Galaxies: Offset BLR in NGC 3227
- ROSAT Detection of the Most Rapidly Varying Seyfert Galaxy
- QSO Evolution: a Link with Starbursts?
- Evolution of Elliptical Galaxies – a Chemo-Dynamical Model
- Birth of Galaxies at z = 2 or Violent Star Formation at z = 0.4?
Type Transitions in Starburst-Powered AGN
Published online by Cambridge University Press: 10 November 2010
- Frontmatter
- Contents
- Participants
- Preface
- Violent Star Formation in 30 Doradus
- The Initial Mass Function of the Center of 30 Doradus
- The Nature and Kinematics of the Emission Nebulae in the Cyg OBI Supershell
- Asymmetry in the Vertical Distribution of Giant Molecular Clouds in the Carina Arm
- Supersonic Motions in Giant HII Regions
- A Kinematical Study of NGC 604
- UV Spectroscopy of Giant Extragalactic HII Regions: the Case of NGC 604
- Evolution of GEHRs: The Effects Caused by Champagne Flows
- Bursts of Star Formation in Central Disks of Galaxies
- Violent Star Formation
- Superassociations as Star Complexes with Violent Star Formation
- Violent Star Formation Driven by Shock-Shock Collisions
- The Search for Hierarchical Structure inside M31 Superassociations
- A Stochastic PSF Model: Smooth Spirals in Differentially Rotating Disks
- Spatiotemporal Pattern Driven by a Self-Regulating Mechanism of Star Formation
- Detection of an Age Gradient along the z-Axis in a Star-Forming Region
- Abundances of HII Regions and the Chemical Evolution of Galaxies
- Galaxy Properties in Different Environments: Star Formation in Bulges of Late-Type Spirals
- Star Formation in Galaxies in the Bootes Void
- Physical Properties of Giant Extragalactic HII Regions
- The Giant HII Region NGC 2363
- Photometric Diagrams of NGC 2366
- Spectroscopical Imaging of Star-Forming Regions
- A Study on the HII Regions of NGC 4449
- Metallicity Effects on the Properties of Very Young Star Clusters
- The Prototype Starburst Galaxy NGC 7714: Physical Conditions of the Gas and the Stellar Populations
- Tracing Violent Star Formation: HI Observations of Nearby Galaxies
- Massive Star Formation and Supergiant Shells in the Irregular Galaxy NGC 55
- Galactic Supershells
- Violent Star Formation in Dwarf Irregular Galaxies
- Very Metal-Poor Galaxies and the Primordial Helium Abundance
- Implications from HI Composition and Lyα Emission of HII Galaxies
- The IR- and X-Radiation of the Starburst Dwarf Galaxy UGCA 86
- High-Resolution CCD Photometry of HII Galaxies
- Formation of Narrow Hell λ4686 Emission in HII Galaxies: Link with X-Ray Emission
- Environmental Effects in Star-Forming Dwarf Galaxies
- Theory of Starburst and Ultraluminous Galaxies
- Colliding Galaxies, Shocked Gas, and Violent Star Formation
- Violent Star Formation in Merger Remnants
- UV Variability of IRAS 13224-3809
- Star Formation in Polar-Ring Galaxies
- Infrared Spectroscopy of IR-Luminous Galaxies
- Application of the Multiphase Model to the Galactic Bulge
- Stellar Populations and Population Gradients in Spiral Bulges
- Implications of Galaxy Alignment for the Galaxy Formation Problem
- Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217
- How a Dust Concentration Mimics Dynamical Signatures around the Nucleus of NGC 7331
- UGC 5101: An Ultraluminous IRAS Galaxy with Circumnuclear Star Formation
- The Stellar Content of Nearby and Distant Starbursts
- WR Stars in the Giant HII Region NGC 4236III
- Consequences of High Mass Loss Rates on Wolf-Rayet Populations in Starbursts
- Optical and Ultraviolet Morphology of the Starburst Regions in Wolf-Rayet Galaxies
- The Starburst Nucleus of M83
- Spectrophotometry of Haro Starburst Galaxies
- Starbursts in the Irregular Galaxy VV 523
- Long-Slit Spectroscopy of the Central Regions of Starburst Galaxies Henize 2-10 and Markarian 52
- Star Formation in Active Galactic Nuclei: the Cases of NGC 5135, NGC 6221 and NGC 7130
- Metallicity Effects on Starburst
- From 30 Doradus to QSOs
- Distance Indicators to Low-Luminosity AGN
- Broad- and Narrow-Band Imaging of the CfA Seyfert Sample
- Type Transitions in Starburst-Powered AGN
- Stellar Ionization of Low-Luminosity Active Galactic Nuclei
- Line Profiles in Compact Supernova Remnants and Active Galactic Nuclei
- Composite Galactic Nuclei
- The Nature and Origin of X-Ray Emission in Active Galaxies
- Starbursts and Compact Supernova Remnants
- Broad-Band and Line Emission from Fast Radiative Shocks in Dense Media
- Study of the Stellar Populations in AGN
- Bidimensional Spectroscopy of Seyfert Galaxies: Offset BLR in NGC 3227
- ROSAT Detection of the Most Rapidly Varying Seyfert Galaxy
- QSO Evolution: a Link with Starbursts?
- Evolution of Elliptical Galaxies – a Chemo-Dynamical Model
- Birth of Galaxies at z = 2 or Violent Star Formation at z = 0.4?
Summary
There is mounting evidence that type transitions are a common property of AGN: the broad lines in at least eleven Seyfert galaxies have appeared or disappeared, leading to the reclassification of their nuclei from type 1–1.5 to type 1.8–2 or vice versa. We show that these phenomena find a natural explanation in the starburst model for AGN as transient phases without supernova activity in a 10–60 Myr old metal-rich massive stellar cluster with a low supernova rate (νSN ≲ 3 yr−1).
Type transient AGN: casuistry
Spectroscopic observations of Seyfert galaxies established early on that the broad permitted lines can experience strong variations in time scales of a few weeks–months. There is a growing number of extreme cases in which the broad components have temporarilly disappeared or become so weak that a reclassification of the objects has been allowed: from Seyfert nuclei of type 1–1.5 to type 1.8–2/LINER. Among them we can find the prototypes NGC 4151 and NGC 5548, along with NGC 1566, NGC 3516, NGC 6814, NGC 7603, Mrk 372 and 3C 390.3. In most of these cases, we know that the transitions took place while the nuclei were in deep photometric minima. Conversely, there are some narrow-line objects that have developed prominent broad components while brightening. Among them we can find Mrk 6, Mrk 993 and Mrk 1018.
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- Violent Star FormationFrom 30 Doradus to QSOs, pp. 347 - 352Publisher: Cambridge University PressPrint publication year: 1994
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