Publications (69)
The pulsar synchrotron: coherent radio emission
Ioannis Contopoulos
We propose a simple physical picture for the generation of coherent radio emission in the axisymmetric pulsar magnetosphere that is quite different from the canonical paradigm of r…
Magnetar Spin-Down
Alice K. Harding, Ioannis Contopoulos, Demosthenes Kazanas
We examine the effects of a relativistic wind on the spin down of a neutron star and apply our results to the study of Soft Gamma Repeaters (SGRs), thought to be neutron stars with…
The Coughing Pulsar Magnetosphere
Ioannis Contopoulos
Polar magnetospheric gaps consume a fraction of the electric potential that develops accross open field lines. This effect modifies significantly the structure of the axisymmetric…
Generation and transport of magnetic flux in accretion-ejection flows
Ioannis Contopoulos
Astrophysical accretion flows are associated with energetic emission of radiation and outflows (winds and jets). Extensive observations of these two processes in X-ray binary outbu…
The Pulsar Magnetosphere with Machine Learning: Methodology
Ioannis Dimitropoulos, Ioannis Contopoulos, Vassilis Mpisketzis +1
In this study, we introduce a novel approach for deriving the solution of the ideal force-free steady-state pulsar magnetosphere in three dimensions. Our method involves partitioni…
Variable Nature of Magnetically-Driven Ultra-Fast Outflows
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
Among a number of active galactic nuclei (AGNs) that drive ionized outflows in X-rays, a low-redshift (z = 0.184) quasar, PDS 456, is long known to exhibit one of the exemplary ult…