Exploring the accretion model of M87 and 3C 84 with the Faraday rotation measure observations

Abstract

Low-luminosity active galactic nuclei (LLAGNs) are believed to be powered by an accretion-jet model, consisting of an inner advection-dominated accretion flow (ADAF), an outer truncated standard thin disk, and a jet. But model degeneracy still exists in this framework. For example, the X-ray emission can originate from either the ADAF or jet. The aim of the present work is to check these models with the Faraday rotation measure (RM) observations recently detected for two LLAGNs, M87 and 3C 84, in the sub-mm band. For M87, we find that the RM predicted by the model in which the X-ray emission originates from the ADAF is larger than the observed upper limit of RM by over two orders of magnitude, while the model in which the X-ray emission originates from the jet predicts a RM lower than the observed upper limit. For 3C 84, the sub-mm emission is found to be dominated by the jet component, while the Faraday screen is attributed to the ADAFs. This scenario can naturally explain the observed {\it external} origin of the RM and why RM is found to be stable during a two-year interval although the sub-mm emission increases at the same period.

10 pages, 9 figures, Accepted for publication in ApJ

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Cited by in corpus (9)

• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• Decomposing the Internal Faraday Rotation of Black Hole Accretion Flows
• Constraint on the black-hole spin of M87 from the accretion-jet model
• Fundamental Plane of Black Hole Activity in Quiescent Regime
• Ordered magnetic fields around the 3C 84 central black hole
• Accretion disks, quasars and cosmology: meandering towards understanding
• Hard X-ray Emission from the M87 AGN Detected with NuSTAR
• Diverse Polarimetric Features of AGN Jets from Various Viewing Angles: Towards a Unified View