Gemini Imaging of the Host Galaxies of Changing-Look Quasars

Abstract

Changing-look quasars are a newly-discovered class of luminous active galactic nuclei that undergo rapid ($\lesssim$10 year) transitions between Type 1 and Type 1.9/2, with an associated change in their continuum emission. We characterize the host galaxies of four faded changing-look quasars using broadband optical imaging. We use \textit{gri} images obtained with the Gemini Multi Object Spectrograph (GMOS) on Gemini North to characterize the surface brightness profiles of the quasar hosts and search for [O III] $\lambda 4959,\lambda 5007$ emission from spatially extended regions, or voorwerpjes, with the goal of using them to examine past luminosity history. Although we do not detect, voorwerpjes surrounding the four quasar host galaxies, we take advantage of the dim nuclear emission to characterize the colors and morphologies of the host galaxies. Three of the four galaxies show morphological evidence of merger activity or tidal features in their residuals. The three galaxies which are not highly distorted are fit with a single Sérsic profile to characterize their overall surface brightness profiles. The single-Sérsic fits give intermediate Sérsic indices between the $n=1$ of disk galaxies and the $n=4$ of ellipticals. On a color-magnitude diagram, our changing-look quasar host galaxies reside in the blue cloud, with other AGN host galaxies and star-forming galaxies. On a color-Sérsic index diagram the changing-look quasar hosts reside with other AGN hosts in the "green valley". Our analysis suggests that the hosts of changing-look quasars are predominantly disrupted or merging galaxies that resemble AGN hosts, rather than inactive galaxies.

arXiv comment20 pages, 5 figures

References in corpus (60)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• The Sloan Digital Sky Survey: Technical Summary
• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Host Galaxies of AGN
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Detailed Structural Decomposition of Galaxy Images
• The Host Galaxies and Classification of Active Galactic Nuclei
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• Observational constraints on growth of massive black holes
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment
• The cosmological evolution of quasar black-hole masses
• Quasars, their host galaxies, and their central black holes
• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• Quasi-Stellar Objects, Ultraluminous IR Galaxies, and Mergers
• Statistical Properties of Bright Galaxies in the SDSS Photometric System
• Quasar Clustering and the Lifetime of Quasars
• A comparative HST imaging study of the host galaxies of radio-quiet quasars, radio-loud quasars and radio galaxies: Paper I
• A Systematic Search for Changing-Look Quasars in SDSS
• Galaxy Zoo : 'Hanny's Voorwerp', a quasar light echo?
• History of Galaxy Interactions and their Impact on Star Formation over the Last 7 Gyr from GEMS
• Discovery of 21 New Changing-look AGNs in Northern Sky
• Size and Structure of the Narrow-Line Region of Quasars
• Total Galaxy Magnitudes and Effective Radii from Petrosian Magnitudes and Radii
• Colors of AGN host galaxies at 0.5<z<1.1 from GEMS
• The Evolution of AGN Host Galaxies: From Blue to Red and the Influence of Large-Scale Structures
• A Mid-IR Selected Changing-Look Quasar and Physical Scenarios for Abrupt AGN Fading
• A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
• Towards an Understanding of Changing-Look Quasars: An Archival Spectroscopic Search in SDSS
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• A new physical interpretation of optical and infrared variability in quasars
• Galaxy And Mass Assembly (GAMA): the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph
• Type 1 AGN at low z. II. The relative strength of narrow lines and the nature of intermediate type AGN
• Extended Emission-Line Regions: Remnants of Quasar Superwinds?
• The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows
• The History and Environment of a Faded Quasar: Hubble Space Telescope observations of Hanny's Voorwerp and IC 2497
• SALT Long-slit Spectroscopy of Luminous Obscured Quasars: An Upper Limit on the Size of the Narrow-Line Region?
• Fading AGN Candidates: AGN Histories and Outflow Signatures
• HST Imaging of Fading AGN Candidates I: Host-Galaxy Properties and Origin of the Extended Gas
• The Sudden Death of the Nearest Quasar
• Gemini Long-slit Observations of Luminous Obscured Quasars: Further Evidence for an Upper Limit on the Size of the Narrow-Line Region
• The detection and X-ray view of the changing look AGN HE 1136-2304
• Massive Star-Forming Host Galaxies of Quasars on Sloan Digital Sky Survey Stripe 82
• Galaxy And Mass Assembly (GAMA): the wavelength dependence of galaxy structure versus redshift and luminosity
• Identification of SDSSJ141324.27+530527.0 as A New "Changing-Look" Quasar with a "Turn-on" Transition
• Recoiling supermassive black hole in changing-look AGN Mrk 1018
• A Census of Broad-Line Active Galactic Nuclei in Nearby Galaxies: Coeval Star Formation and Rapid Black Hole Growth
• The [O III] Nebula of the Merger Remnant NGC 7252: A Likely Faint Ionization Echo
• Imaging Extended Emission-Line Regions of Obscured AGN with the Subaru Hyper Suprime-Cam Survey
• The Close AGN Reference Survey (CARS): Mrk 1018 halts dimming and experiences strong short-term variability
• Interactions as a Driver of Galaxy Evolution
• Spatially-Resolved Spectra of the "Teacup" AGN: Tracing the History of a Dying Quasar
• An Active Galactic Nucleus Caught in the Act of Turning Off and On
• Low redshift quasars in the SDSS Stripe 82. Host galaxy colors and close environment

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• The Time Domain Spectroscopic Survey: Changing-Look Quasar Candidates from Multi-Epoch Spectroscopy in SDSS-IV
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• The Landscape of Galaxies Harboring Changing-Look Active Galactic Nuclei in the Local Universe
• A Systematic Analysis of Stellar Populations in the Host Galaxies of Changing-look AGNs
• Host Galaxy Properties of Changing-look AGN Revealed in the MaNGA Survey
• Local Active Galactic Nuclei with Large Broad-Hα Variability Reside in Red Galaxies
• Active galactic nuclei catalog from the AKARI NEP Wide field
• Modeling Star Formation Histories of Changing-Look AGN Host Galaxies with Prospector
• Identifying Changing-Look AGN Transitions in Light Curve Data with the Zwicky Transient Facility