Is very high energy emission from the BL Lac 1ES 0806+524 centrifugally driven?

TL;DR

This paper explores whether centrifugal acceleration of electrons near the supermassive black hole in BL Lac 1ES 0806+524 can explain its observed very high energy gamma-ray emission, considering inverse Compton scattering and magnetic field geometry.

Contribution

It presents a detailed analysis of centrifugal electron acceleration and its potential to produce VHE emission, incorporating dynamics, cooling processes, and specific magnetic field configurations.

Findings

Centrifugal acceleration can produce electrons with sufficient energy for VHE emission.

The observed VHE pattern is consistent with electron densities within a specific range.

Inclination angles of magnetic field lines critically influence the acceleration efficiency.

Abstract

We investigate the role of centrifugal acceleration of electrons in producing the very high energy (VHE) radiation from the BL Lac object 1ES 0806+524, recently detected by VERITAS. The efficiency of the inverse Compton scattering (ICS) of the accretion disk thermal photons against rotationally accelerated electrons is examined. By studying the dynamics of centrifugally induced outflows and by taking into account a cooling process due to the ICS, we estimate the maximum attainable Lorentz factors of particles and derive corresponding energetic characteristics of the emission. Examining physically reasonable parameters, by considering the narrow interval of inclination angles (0.7^o-0.95^o) of magnetic field lines with respect to the rotation axis, it is shown that the centrifugally accelerated electrons may lead to the observational pattern of the VHE emission, if the density of electrons is in a certain interval.