Long-term optical spectral monitoring of a changing-look AGN NGC 3516 I: Continuum and broad-line flux variability

Abstract

Here we present the long-term optical spectral monitoring of a changing-look active galactic nuclei (AGN) NGC 3516 that covers 22 years (from 1996 to 2018). We explore a variability in the broad lines and continuum, finding that the continuum is changing by more than a factor of 2, while the broad lines are varying by more than a factor of 10. The minimum of activity is observed in 2014, when the broad lines almost disappeared. We confirm that NGC 3516 is a changing-look AGN, and the absorption seen in the UV and X-ray may indicate that there is an obscuring region which is responsible for this. The line profiles are also changing. The mean profiles of the broad Halpha and Hbeta lines show shoulder-like structure in the wings, and enhanced peak, that may indicate a complex BLR. The rms-profiles of both lines seem to have the same shape and width of around 4200 km/s, indicating practically the same kinematics in the Halpha and Hbeta emitting regions. Measured time-lags between the continuum and Halpha and Hbeta broad-line variability are ~15 and 17 days, respectively, that in combination with the broad lines width allows us to estimate the NGC 3516 central black hole mass. We find that the black hole mass is 4.73+-1.40 x 10^7M_sun which is in agreement with previous estimates.

arXiv commentAccepted for publication in MNRAS

References in corpus (45)

• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Supermassive Black Holes in Active Galactic Nuclei. II. Calibration of the M-sigma Relationship for AGNs
• Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies
• Modeling reverberation mapping data II: dynamical modeling of the Lick AGN Monitoring Project 2008 dataset
• Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
• Spectral Classification of Quasars in the Sloan Digital Sky Survey: Eigenspectra; Redshift and Luminosity Effects
• Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale
• The black hole mass - stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
• Changing look: from Compton-thick to Compton-thin, or the re-birth of fossil AGN
• Explaining changing-look AGN with state transition triggered by rapid mass accretion rate drop
• Spectral Classification of Galaxies: An Orthogonal Approach
• Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
• Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey
• Geometric and Dynamical Models of Reverberation Mapping Data
• The Structure of the Broad-Line Region In Active Galactic Nuclei. II. Dynamical Modeling of Data from the AGN10 Reverberation Mapping Campaign
• Spectral Decomposition of Broad-Line AGNs and Host Galaxies
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XI. Techniques for time delay measurement in presence of microlensing
• The flux ratio of the [OIII] 5007,4959 lines in AGN: Comparison with theoretical calculations
• Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-Based Monitoring of 3C 390.3
• Spectroscopic Indication for a Centi-parsec Supermassive Black Hole Binary in the Galactic Center of NGC 5548
• Velocity-resolved reverberation mapping of five bright Seyfert 1 galaxies
• Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564
• Evidence for periodicity in 43 year-long monitoring of NGC 5548
• A search for changing-look AGN in the Grossan catalog
• Long-term variability of the optical spectra of NGC 4151: I. Light curves and flux correlations
• Profile variability of the H-alpha and H-beta broad emission lines in NGC5548
• Spectropolarimetry of Seyfert 1 galaxies with equatorial scattering: Black hole masses and Broad Line Region characteristics
• Intermediate resolution H-beta spectroscopy and photometric monitoring of 3C 390.3 I. Further evidence of a nuclear accretion disk
• Variable UV Absorption in the Seyfert 1.5 Galaxy NGC 3516: The Case for Associated UV and X-ray Absorption
• Black Hole Masses in Three Seyfert Galaxies
• Spectral optical monitoring of 3C390.3 in 1995-2007: I. Light curves and flux variation of the continuum and broad lines
• X-ray Characteristics of NGC 3516: A View through the Complex Absorber
• Spectral optical monitoring of the double peaked emission line AGN Arp 102B: II. Variability of the broad line properties
• X-ray and Optical Correlation of Type I Seyfert NGC 3516 Studied with Suzaku and Japanese Ground-Based Telescopes
• Recoiling supermassive black hole in changing-look AGN Mrk 1018
• Spectral optical monitoring of 3C 390.3 in 1995-2007: II. Variability of the spectral line parameters
• First long-term optical spectro-photometric monitoring of a binary black hole candidate E1821+643: I. Variability of spectral lines and continuum
• X-Ray Absorption Analysis of NGC3516: Appearance of Fast Components with Increased Source Flux
• Spectral optical monitoring of a double-peaked emission line AGN Arp 102B: I. Variability of spectral lines and continuum
• Long-term optical spectral monitoring of NGC 7469
• Virilization of the Broad Line Region in Active Galactic Nuclei - connection between shifts and widths of broad emission lines
• Formation of Ionization-Cone Structures in Active Galactic Nuclei: I. Stationary Model and Linear Stability Analysis
• A Multiwavelength Cross-Correlation Variability Study of Fermi-LAT Blazars
• Photoionization Modeling of the Low Luminosity Seyfert 1 Nucleus in NGC 3516

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• A Systematic Analysis of Stellar Populations in the Host Galaxies of Changing-look AGNs
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• Investigating Changing-Look Active Galactic Nuclei with Long-term Optical and X-Ray Observations
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• Long-term optical spectral monitoring of a changing-look active galactic nucleus NGC 3516 -- II. Broad-line profile variability
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• A Systematic Survey for z < 0.04 Changing-Look AGNs
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• Small telescopes being effective: MAGIC or not?
• PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis
• The Shape of AGN-Driven Winds in the Seyfert Galaxy NGC 3516
• Modeling quasar variability through self-organizing map-based process
• The first supermassive black hole mass measurement in active galactic nuclei using the polarization of broad emission line Mg II
• Time Domain Astronomy with the THESEUS Satellite