Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 3516

Abstract

The changes of broad emission lines should be a crucial issue to understanding the physical properties of changing-look active galactic nucleus (CL-AGN). Here, we present the results of an intensive and homogeneous 6-month long reverberation mapping (RM) monitoring campaign during a low-activity state of the CL-AGN Seyfert galaxy NGC 3516. Photometric and spectroscopic monitoring was carried out during 2018--2019 with the Lijiang 2.4 m telescope. The sampling is 2 days in most nights, and the average sampling is $\sim$3 days. The rest frame time lags of H$\alpha$ and H$\beta$ are ${\tau }_{\mathrm{H}\alpha }=7.56_{-2.10}^{+4.42}$ days and ${\tau }_{\mathrm{H}\beta }=7.50_{-0.77}^{+2.05}$ days, respectively. From a RMS H$\beta$ line dispersion of ${\sigma }_{\mathrm{line}}=1713.3\pm 46.7$ $\mathrm{km}$ ${\mathrm{s}}^{-1}$ and a virial factor of $f_{\sigma }$ = 5.5, the central black hole mass of NGC 3516 is estimated to be $M_{\mathrm{BH}}=2.4_{-0.3}^{+0.7}\times 10^7{M}_{\odot }$, which is in agreement with previous estimates. The velocity-resolved delays show that the time lags increase towards negative velocity for both H$\alpha$ and H$\beta$. The velocity-resolved RM of H$\alpha$ is done for the first time. These RM results are consistent with other observations before the spectral type change, indicating a basically constant BLR structure during the changing-look process. The CL model of changes of accretion rate seems to be favored by long-term H$\beta$ variability and RM observations of NGC 3516.

25 pages, 6 figures, Accepted for publication in ApJ

References in corpus (21)

• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• The black hole mass - stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
• The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
• Broad-line Balmer Decrements in Blue Active Galactic Nuclei
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• The destruction and recreation of the X-ray corona in a changing-look Active Galactic Nucleus
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• A possible mechanism for multiple changing look phenomenon in Active Galactic Nuclei
• Double-peaked profiles: ubiquitous signatures of disks in the Broad Emission Lines of Active Galactic Nuclei
• New changing look case in NGC 1566
• Reverberation Mapping of the Broad-line Region in NGC 5548: Evidence for Radiation Pressure?
• Long-term optical spectral monitoring of a changing-look AGN NGC 3516 I: Continuum and broad-line flux variability
• Astronomical Site Monitoring System at Lijiang Observatory
• A flare in the optical spotted in the changing-look Seyfert NGC 3516
• Broad-line Region of the Quasar PG 2130+099 from a Two-Year Reverberation Mapping Campaign with High Cadence
• Broad line region and black hole mass of PKS 1510-089 from spectroscopic reverberation mapping
• Optical and X-ray discovery of the changing-look AGN IRAS23226-3843 showing extremely broad and double-peaked Balmer profiles
• Improving the Flux Calibration in Reverberation Mapping by Spectral Fitting: Application to the Seyfert Galaxy MCG--6-30-15
• Search for intra-day optical variability in Mrk 501
• Dust Reverberation Mapping of Z229-15
• Radiation Magnetohydrodynamic Simulations of Sub-Eddington accretion Flows in AGN: Origin of Soft X-ray Excess and Rapid Time Variabilities

Cited by in corpus (22)

• Reverberation Mapping Measurements of Black Hole Masses and Broad-Line Region Kinematics in Mrk 817 and NGC 7469
• Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC~4151 During Outburst Stage: Evidence for Kinematics Evolution of Broad-line Region
• Velocity-resolved Reverberation Mapping of Changing-look AGN NGC 2617
• Multi-Wavelength Monitoring and Reverberation Mapping of a Changing Look Event in the Seyfert Galaxy NGC 3516
• Changing-look event in NGC 3516: continuum or obscuration variability?
• WISE view of changing-look AGNs: evidence for a transitional stage of AGNs
• Narrow Fe-K$\alpha$ Reverberation Mapping Unveils the Deactivated Broad-Line Region in a Changing-Look Active Galactic Nucleus
• Velocity-resolved Reverberation Mapping of Changing-look Active Galactic Nucleus NGC 4151 during Outburst Stage. II. Four Season Observation Results
• Long-term optical spectral monitoring of a changing-look active galactic nucleus NGC 3516 -- II. Broad-line profile variability
• Spiral Arms in Broad-line Regions of Active Galactic Nuclei. II. Loosely Wound Cases: Reverberation Properties
• Statistical analysis of AlIII 1860 and CIII] 1909 emission lines as virial black hole mass estimators in quasars
• The Fermi-LAT view of the changing-look blazar OQ 334
• Fundamental Reference AGN Monitoring Experiment (FRAMEx) III: Radio Emission in the Immediate Vicinity of Radio Quiet AGNs
• B3\,0749+460A: A New "Changing-Look" Active Galactic Nucleus Associated with X-ray Spectral Slope Variations
• Velocity-Resolved Ionization Mapping of Broad Line Region. I. Insights into Diverse Geometry and Kinematics
• Measuring the Virial Factor in SDSS DR5 Quasars with Redshifted H$\beta$ and Fe ii Broad Emission Lines
• The Mini-SiTian Array: Optical design
• Strange Quasar Candidates with Abnormal Astrometric Characteristics from Gaia EDR3 and SDSS (SQUAB-II): Optical Identifications
• Measuring the Virial Factor in SDSS DR7 AGNs with Redshifted H$\beta$ and H$\alpha$ Broad Emission Lines
• Morpho-Photometric Classification of KiDS DR5 Sources Based on Neural Networks: A Comprehensive Star-Quasar-Galaxy Catalog
• Correcting the Contamination of Second-order Spectra: Improving Hα Measurements in Reverberation Mapping Campaigns
• Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass