Hoyle on Copernicus

N. Copernicus Astronomical Center

In our review of the blazar phenomenon, we discuss blazar models, with a focus on the following issues: sub-parsec jets and their environment; energy dissipation and particle acceleration; and radiative processes.

Leadership Eric Hoyle

Hoyle–Lyttleton Accretion onto Accretion Disks

We investigate Hoyle–Lyttleton accretion for the case where the central source is a luminous accretion disk. In classical Hoyle-Lyttleton accretion onto a “spherical” source, accretion takes place in an axially symmetric manner around a so-called accretion axis. In the spherical case the accretion rate Ṁ is given as ṀHL(1− Γ), where ṀHL is the accretion rate of the classical Hoyle–Lyttleton acc...

Copernicus-Daten und Informationsdienste für alle

Earth observation data and related services from the Copernicus Program are meanwhile embedded in the European spatial data infrastructures. From land, marine and atmosphere monitoring to emergency management and support to humanitarian action, the rich service portfolio provides satellite-based information products for Europe and – for some applications – even globally. This AGIT Special addre...

Effect of Radiation Drag on Hoyle-Lyttleton Accretion

Hoyle-Lyttleton type accretion is investigated, by taking account of not only the effect of radiation pressure but the effect of radiation drag. We calculate the trajectories of particles for three cases: only the effect of gravity is considered (case A); the effect of radiation pressure is taken into account (case B); the effect of radiation drag as well as radiation pressure is taken into acc...