Jet Launching Radius in Low-Power Radio-Loud AGNs in Advection-Dominated Accretion Flows

TL;DR

This study estimates jet launching radii and accretion rates in low-power radio-loud AGNs, revealing how jet formation depends on accretion dynamics and proximity to the black hole horizon.

Contribution

It introduces a theoretical method to determine jet launching locations and accretion rates in AGNs based on observed jet powers, emphasizing the relation to accretion flow properties.

Findings

Jet launching radius decreases with increasing accretion rate.

Significant energy conversion occurs near the event horizon.

Jet formation ceases beyond 44 gravitational radii.

Abstract

Using our theory for the production of relativistic outflows, we estimate the jet launching radius and the inferred mass accretion rate for 52 low-power radio-loud AGNs based on the observed jet powers. Our analysis indicates that (1) a significant fraction of the accreted energy is required to convert the accreted mass to relativistic energy particles for the production of the jets near the event horizon, (2) the jets launching radius moves radially toward the horizon as the mass accretion rate or jets power increases, and (3) no jet/outflow formation is possible beyond 44 gravitational radii.