Accretion Disk MHD Winds and Blazar Classification

Abstract

The Fermi Gamma-Ray Space Telescope observations of blazars show a strong correlation between the spectral index of their gamma-ray spectra and their synchrotron peak frequency ${\nu }_{\mathrm{pk}}^{\mathrm{syn}}$; additionally, the rate of Compton Dominance of these sources also seems to be a function of ${\nu }_{\mathrm{pk}}^{\mathrm{syn}}$. In this work, we adopt the assumption that the nonthermal emission of blazars is primarily due to radiation by a population of Fermi-accelerated electrons in a relativistic outflow (jet) along the symmetry axis of the blazar's accretion disk. Furthermore, we assume that the Compton component is related to an external photon field of photons, which are scattered from particles of the magnetohydrodynamic (MHD) wind emanating from the accretion disk. Our results reproduce well the aforementioned basic observational trends of blazar classification by varying just one parameter, namely the mass accretion rate onto the central black hole.

arXiv comment5 pages, 3 figures, submitted to MNRAS Letters

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• The Fermi-LAT view of the changing-look blazar OQ 334
• Powerful extragalactic jets dissipate their kinetic energy far from the central black hole
• Multi-Frequency Study of Spectral Indices of BL Lacertae Objects and Flat Spectrum Radio Quasars
• A one-parameter two-zone leptonic model for the blazar sequence
• A two-zone emission model for Blazars and the role of Accretion Disk MHD winds