The orientation dependence of quasar single-epoch black hole mass scaling relationships

Abstract

Black hole masses are estimated for radio-loud quasars using several self-consistent scaling relationships based on emission-line widths and continuum luminosities. The emission lines used, H-beta, Mg II, and C IV, have different dependencies on orientation as estimated by radio core dominance. We compare differences in the log of black hole masses estimated from different emission lines and show that they depend on radio core dominance in the sense that core-dominated, jet-on objects have systematically smaller H-beta and Mg II determined masses compared to those from C IV, while lobe-dominated edge-on objects have systematically larger H-beta and Mg II determined masses compared to those from C IV. The effect is consistent with the H-beta line width, and to a lesser extent that of Mg II, being dependent upon orientation in the sense of a axisymmetric velocity field plus a projection effect. The size of the effect is nearly an order of magnitude in black hole mass going from one extreme orientation to the other. We find that radio spectral index is a good proxy for radio core dominance and repeating this analysis with radio spectral index yields similar results. Accounting for orientation could in principle significantly reduce the scatter in black hole mass scaling relationships, and we quantify and offer a correction for this effect cast in terms of radio core dominance and radio spectral index.

16 pages, 16 figures, accepted to MNRAS

References in corpus (9)

• The effect of radiation pressure on virial black hole mass estimates and the case of Narrow Line Seyfert 1 galaxies
• Reverberation Mapping Results for Five Seyfert 1 Galaxies
• Are Outflows Biasing Single-Epoch CIV Black Hole Mass Estimates?
• Orientation dependency of broad-line widths in quasars and consequences for black-hole mass estimation
• On the geometry of broad emission region in quasars
• Spectral Properties From Lyman-alpha to H-alpha For An Essentially Complete Sample of Quasars I: Data
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. III. Deep VLA Images at 1.4 GHz
• An Improved Method for Using MgII to Estimate Black Hole Masses in Active Galactic Nuclei
• Simultaneous Ultraviolet and Optical Emission-line Profiles of Quasars: Implications for Black Hole Mass Determination

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