6 papers
A Critical Eddington Ratio for X-Shaped Radio Galaxies
David Garofalo
We derive a quantitative condition for the formation of X-shaped radio galaxies by evaluating the competition between black hole spin evolution and the radiative fading of relic pl…
Winds Versus Jets in Active Galactic Nuclei
David Garofalo, Chandra B. Singh, Atticus Magerko +3
The well-established anti-correlation between disk winds and relativistic jets in X-ray binaries is often interpreted in a scale-invariant black hole accretion context. If so, acti…
A GRMHD-Calibrated Semi-Analytical Model for Hot Sub-Keplerian Accretion Flows in Kerr Spacetime
Nabin Bhushal, Manil Khatiwada, Yogesh Maharjan +2
We develop a simple, semi-analytical, kinematic model for hot, thick accretion flows, constructed by interpolating between Keplerian and free-fall geodesic solutions in the Kerr me…
On the origin and nature of double-double radio galaxies
David Garofalo, Zhiyuan Liu, Atticus V. Magerko
Double-double radio galaxies (DDRGs) display inner and outer jets or lobes thought to result from intermittent accretion. Due to randomly triggered accretion events, the lifetime o…
How a Klein-Nishina Modified Eddington limited accretion explains rapid black hole growth in the early universe
Jackson Frangos, Erick Rosen, Michael Williams +2
The discovery of quasars and their supermassive black holes (SMBHs) over merely hundreds of millions of years after the Big Bang generates tension with the idea…
Why Jet Power and Star Formation Are Uncorrelated in Active Galaxies
David Garofalo, Brent McDaniel, Max North
Jet luminosity from active galaxies and the rate of star formation have recently been found to be uncorrelated observationally. We show how to understand this in the context of a m…