Two New "Turn-off" Changing-look Active Galactic nuclei and Implication on "Partially Obscured" AGNs

Abstract

We here report a spectroscopic identification of two new changing-look AGNs (CL-AGNs): SDSS\,J104705.16+544405.8 and SDSS\,J120447.91+170256.8 both with a "turn-off" type transition from type 1 to type 1.8/1.9. The identification is arrived by a follow-up spectroscopic observation of the five changing-look AGN (CL-AGN) candidates that are extracted from the sample recently released in Macleod et al. The candidates are extract by the authors from the Sloan Digit Sky Survey Data Release 7 spectroscopically confirmed quasars with large amplitude variability. By compiling a sample of 26 previously identified CL-AGNs, we confirm the claim in Macleod et al. that CL-AGNs tend to be biased against low Eddington ratio, and identify an overlap between the CL-AGNs at their dim state and the so-called intermediate-type AGNs. The overlap implies that there two populations of the intermediate-type AGNs with different origins. One is due to the torus orientation effect, and the another the intrinsic change of the accretion rate of the central supermassive blackholes.

10 pages, 6 figures and 2 tables, accepted by ApJ

References in corpus (55)

• Stellar population synthesis at the resolution of 2003
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• A Catalog of Quasar Properties from SDSS DR7
• Estimating Black Hole Masses in Active Galaxies Using the Halpha Emission Line
• The Relationship Between Luminosity and Broad-Line Region Size in Active Galactic Nuclei
• Initial Performance of the NEOWISE Reactivation Mission
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• The diversity of quasars unified by accretion and orientation
• A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample
• A Systematic Search for Changing-Look Quasars in SDSS
• The unusual emission line spectrum of IZw1
• Changing look: from Compton-thick to Compton-thin, or the re-birth of fossil AGN
• Broad Emission Line Regions in AGN: the Link with the Accretion Power
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• Discovery of 21 New Changing-look AGNs in Northern Sky
• On the Disappearance of the Broad-Line Region in Low-Luminosity Agns
• 1ES 1927+654: An AGN Caught Changing Look on a Timescale of Months
• Continuum and Emission Line Strength Relations for a large Active Galactic Nuclei Sample
• Evolution of Broad-line Emission from Active Galactic Nuclei
• A Mid-IR Selected Changing-Look Quasar and Physical Scenarios for Abrupt AGN Fading
• Changing-Look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars
• The Xinglong 2.16-m Telescope: Current Instruments and Scientific Projects
• Towards an Understanding of Changing-Look Quasars: An Archival Spectroscopic Search in SDSS
• Mid-infrared variability of changing-look AGN
• Science with a wide-field UV transient explorer
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• On the variability of quasars: a link between Eddington ratio and optical variability?
• Supermassive black holes with high accretion rates in active galactic nuclei: II. the most luminous standard candles in the Universe
• Extreme AGN variability: evidence of magnetically elevated accretion?
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• Black hole mass estimation with a relation between the BLR size and emission line luminosity of AGN
• A new physical interpretation of optical and infrared variability in quasars
• Zoom-Simulations of Protoplanetary Disks starting from GMC scales
• Quasar Viscosity Crisis
• A New Class of Changing-Look LINERs
• The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source
• The Swift BAT-detected Seyfert 1 Galaxies: X-ray Broadband Properties and Warm Absorbers
• Long-term variability of the optical spectra of NGC 4151: II. Evolution of the broad Ha and Hb emission-line profiles
• IC 751: a new changing-look AGN discovered by NuSTAR
• Iron Opacity Bump Changes the Stability and Structure of Accretion Disks in Active Galactic Nuclei
• The Close AGN Reference Survey (CARS) - What is causing Mrk1018's return to the shadows after 30 years?
• Estimating Black Hole Masses in Quasars Using Broad Optical and UV Emission Lines
• Rapid "Turn-on" of type 1 AGN in a quiescent early type galaxy SDSS1115+0544
• Identification of SDSSJ141324.27+530527.0 as A New "Changing-Look" Quasar with a "Turn-on" Transition
• Outflows from active galactic nuclei: The BLR-NLR metallicity correlation
• The XMM-Newton view of IRAS 09104+4109: evidence for a changing-look Type 2 quasar?
• A catalog of quasar properties from the Baryon Oscillation Spectroscopic Survey
• Extending the Eigenvector 1 Space to the Optical Variability of Quasars
• Wide-field Ultraviolet Imager for Astronomical Transient Studies
• Role of Feedback in AGN-HOST Coevolution: A Study from Partially Obscured Active Galactic Nuclei
• Learning Transient Universe in Near-Ultraviolet By Wide-angle Cameras

Cited by in corpus (17)

• Exploring Changing-look Active Galactic Nuclei with the Sloan Digital Sky Survey V: First Year Results
• Changing-look active galactic nuclei: close binaries of supermassive black holes in action
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine
• The Eddington ratio-dependent changing look events in NGC 2992
• A magnetic accretion disk-outflow model for changing look active galactic nuclei
• WISE view of changing-look AGNs: evidence for a transitional stage of AGNs
• A Systematic Analysis of Stellar Populations in the Host Galaxies of Changing-look AGNs
• Optical and X-ray discovery of the changing-look AGN IRAS23226-3843 showing extremely broad and double-peaked Balmer profiles
• The Type 1 and Type 2 AGN dichotomy according to their ZTF optical variability
• Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 4151 during Outburst Stage. II. Four Season Observation Results
• The origin of the vanishing soft X-ray excess in the changing-look Active Galactic Nucleus Mrk 590
• Suspended and restored activities of A Nearby Super Massive Black Hole
• B3\,0749+460A: A New "Changing-Look" Active Galactic Nucleus Associated with X-ray Spectral Slope Variations
• AstroSat view of spectral transition in the changing-look active galaxy NGC1566 during the declining phase of the 2018 outburst
• Does Feedback from Supermassive Blackhole Co-evolve With Host In Type 2 Quasars?
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• PEARLS: Discovery of Point-Source Features Within Galaxies in the North Ecliptic Pole Time Domain Field