Estimating supermassive black hole masses in AGNs using polarization of broad MgII, H$\alpha$ and H$\beta$ lines

Abstract

For type-1 active galactic nuclei (AGNs) for which the equatorial scattering is the dominant broad line polarization mechanism, it is possible to measure the supermassive black hole mass by tracing the Keplerian motion across the polarization plane positionangle. So far this method has been used for 30 objects but only for H$\alpha$ emission line. We explore the possibilities this method for determining SMBH masses using polarization in broad emission lines by applying it for the first time to Mg II$\lambda$2798AA spectral line. We use 3D Monte Carlo radiative transfer code stokes for simultaneous modeling of equatorial scattering of H$\alpha$, H$\beta$ and Mg II lines. We included vertical inflows and outflows in the MgII broad line region (BLR). We find that polarization states of H$\alpha$ and H$\beta$ lines are almost identical and SMBH mass estimates differ by 7%. For Mg II line, we find that polarization angle $\phi$ exhibits an additional "plateau" with a constant $\phi$, which deviates than the profiles expected for pure Keplerian motion. SMBH mass estimates using Mg II line are higher by up to 35% than those obtained from H$\alpha$ and H$\beta$ lines. Our model shows that for vertical inflows and outflows in the BLR that is higher or comparable to Keplerian velocity, this method can be applied as a first approximation for obtaining SMBH mass.

arXiv comment8 pages, 4 figures, 3 tables, accepted for publishing in MNRAS

References in corpus (50)

• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• Observational Evidence of AGN Feedback
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Revisiting the Unified Model of Active Galactic Nuclei
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• The Relationship Between Luminosity and Broad-Line Region Size in Active Galactic Nuclei
• Reverberation Mapping of High-Luminosity Quasars: First Results
• The AGN Black Hole Mass Database
• What controls the C IV line profile in active galactic nuclei?
• Black Hole Growth to z = 2 - I: Improved Virial Methods for Measuring M_BH and L/L_Edd
• Supermassive black holes with high accretion rates in active galactic nuclei: I. First results from a new reverberation mapping campaign
• Reverberation Measurements of the Inner Radius of the Dust Torus in 17 Seyfert Galaxies
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H$\beta$ Time Lags and Implications for Super-Eddington Accretion
• The Sloan Digital Sky Survey Reverberation Mapping Project: H$\alpha$ and H$\beta$ Reverberation Measurements From First-year Spectroscopy and Photometry
• Estimating Black Hole Masses in Active Galactic Nuclei Using the MgII 2800 Emission Line
• A Reverberation-Based Mass for the Central Black Hole in NGC 4151
• The Lick AGN Monitoring Project: Reverberation Mapping of Optical Hydrogen and Helium Recombination Lines
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H$\beta$ Lags
• The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
• The Radius-Luminosity Relationship Depends on Optical Spectra in Active Galactic Nuclei
• Mapping the radial structure of AGN tori
• The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region
• Active galactic nuclei at z~1.5: II. Black Hole Mass estimation by means of broad emission lines
• Modeling optical and UV polarization of AGNs I. Imprints of individual scattering regions
• The Sloan Digital Sky Survey Reverberation Mapping Project: First Broad-line Hbeta and MgII Lags at z>~0.3 from six-Month Spectroscopy
• The effect of nuclear gas distribution on the mass determination of supermassive black holes
• The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data
• Equatorial scattering and the structure of the broad-line region in Seyfert nuclei: evidence for a rotating disc
• Flare-like variability of the Mg IIλ2800Å emission line in the gamma-ray blazar 3C 454.3
• Is Mg II 2800 a Reliable Virial Broadening Estimator for Quasars?
• Modeling optical and UV polarization of AGNs II. Polarization imaging and complex reprocessing
• Spectropolarimetry of Seyfert 1 galaxies with equatorial scattering: Black hole masses and Broad Line Region characteristics
• The Sloan Digital Sky Survey Reverberation Mapping Project: Ensemble Spectroscopic Variability of Quasar Broad Emission Lines
• Modeling optical and UV polarization of AGNs III. From uniform-density to clumpy regions
• The structure of the Mg II broad line emitting region in Type 1 AGNs
• The UV and optical Fe II emission lines in type 1 AGNs
• Low-Ionization Outflows in High Eddington Ratio Quasars
• AGN Black hole mass estimates using polarization in broad emission Lines
• Modeling optical and UV polarization of AGNs V. Dilution by interstellar polarization and the host galaxy
• Variability in Spectropolarimetric properties of Sy 1.5 galaxy Mrk 6
• Polarization in lines - a new method for measuring black hole masses in active galaxies
• Dust reverberation mapping in the era of big optical surveys and its cosmological application
• Long-term monitoring of the broad-line region properties in a selected sample of AGN
• Long term variability of the Broad Emission Line profiles in AGN
• Measuring black hole mass of type I active galactic nuclei by spectropolarimetry
• The polarized signal from broad emmission lines in AGN
• 2004 - 2014: Ten years of radiative transfer with STOKES
• Comparison between the influence of outflows and supermassive binary black holes in active galactic nuclei on the polarization angle profiles

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