Determination of magnetic field strength on the event horizon of supermassive black holes in active galactic nuclei

Abstract

We estimated the magnetic field strength at the event horizon for a sample of supermassive black holes (SMBHs) in active galactic nuclei (AGNs). Our estimates were made using the values of the inclination angles of the accretion disk to the line of sight, that we obtained previously from spectropolarimetric observations in the visible spectrum. We also used published values of full width at half maximum (FWHM) of spectral line $H_{\beta }$ from broad line region, masses of SMBHs and luminosity of AGNs at 5100 angstrom. In addition we used literature data on the spins of SMBHs obtained from their X-ray spectra. Our estimates showed that the magnetic field strength at the event horizon of the majority of SMBHs in AGNs ranges from several to tens of kG and have mean values of about $10^4$G. At the same time, for individual objects, the fields are significantly larger - of the order of hundreds kG or even 1 MG.

arXiv comment8 pages, 8 figures

References in corpus (32)

• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• Measuring Black Hole Spin using X-ray Reflection Spectroscopy
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• Measuring the kinetic power of AGN in the radio mode
• A Magnetically-Switched, Rotating Black Hole Model For the Production of Extragalactic Radio Jets and the Fanaroff and Riley Class Division
• Enhanced Star Formation in Narrow Line Seyfert 1 AGN revealed by Spitzer
• The Structure of the Broad-Line Region In Active Galactic Nuclei. II. Dynamical Modeling of Data from the AGN10 Reverberation Mapping Campaign
• Evolution characteristics of central black hole of magnetized accretion disc
• Line driven winds and the UV turnover in AGN accretion discs
• Accretion Disk Torqued by a Black Hole
• A Highly Magnetized Twin-Jet Base Pinpoints a Supermassive Black Hole
• Black Hole Spin and Accretion Disk Magnetic Field Strength Estimates for more than 750 AGN and Multiple GBH
• The Effects of Disc Winds on the Spectrum and Black Hole Growth Rate of Active Galactic Nuclei
• The Sloan Digital Sky Survey Reverberation Mapping Project: Accretion-Disk Sizes from Continuum Lags
• Geometry and inclination of the broad line region in blazars
• Are there reliable methods to estimate the nuclear orientation of Seyfert galaxies?
• Extending the Shakura-Sunyaev approach to a strongly magnetized accretion disc model
• On the Accretion Rates and Radiative Efficiencies of the Highest Redshift Quasars
• Quasar Accretion Disk Sizes from Continuum Reverberation Mapping in the DES Standard Star Fields
• Magnetic coupling of a rotating black hole with its surrounding accretion disk
• Active galactic nuclei at z ~ 1.5: III. Accretion discs and black hole spin
• Accretion and jet power in active galactic nuclei
• Winds Can "Blow Up" AGN Accretion Disk Sizes
• Broad-line region structure and line profile variations in the changing look AGN HE1136-2304
• Influence of the Magnetic Coupling Process on the Advection Dominated Accretion Flows around Black Holes
• A Fundamental Line of Black Hole Activity
• Constraints on accretion disk size in the massive type 1 quasar PG 2308+098 from optical continuum reverberation lags
• Single-Epoch Black Hole Mass Estimators For Broad-Line Active Galactic Nuclei: Recalibrating Hbeta with A New Approach
• Is there a connection between Broad Absorption Line Quasars and Narrow Line Seyfert 1 galaxies?
• Quasar Host Galaxies and the $M_{SMBH}$ - ${\sigma }_{\ast }$ Relation

Cited by in corpus (8)

• Cosmic Ray Extremely Distributed Observatory
• The Estimation of Fundamental Physics Parameters for Fermi-LAT Blazars
• Black hole in a combined magnetic field: ionized accretion disks in the jetlike and looplike configurations
• Radiative Back-Reaction on Charged Particle Motion in the Dipole Magnetosphere of Neutron Stars
• Powerful Jets from Radiatively Efficient Disks, a Decades-Old Unresolved Problem in High Energy Astrophysics
• On the Non-Minimal Coupling of Magnetic Fields with Gravity in Schwarzschild Spacetime
• Probing AGN with spectropolarimetry: accretion disk and SMBH parameters
• Determination of the Physical Parameters of AGNs in Seyfert 1 Galaxies LEDA 3095839 and VII Zw 244 Based on Spectropolarimetric Observations