Theory Group


Cosmic Reionization

Early Universe

First Stars & Galaxies

Fundamental Physics

Structure Formation

Extragalactic Astrophysics

Active Galactic Nuclei

Clusters of Galaxies

Theoretical & Computational Astrophysics

Galactic Evolution

ISM and Star Formation

Milky Way Evolution

Planetary Sciences


Planet Formation

Stellar Astrophysics


Gamma-ray Bursts

Neutron Stars & Magnetars


White Dwarfs

Theory Group : Extragalactic Astrophysics : Active Galactic Nuclei

Gregory Shields

ADS | astro-ph

Gregory Shields  

Professor (Retired)


Research Interests

Active galactic nuclei; supermassive black holes; chemical evolution of galaxies.

Group Areas

Extragalactic, Black Holes & AGN, Active Galactic Nuclei

Test particle simulation of accretion disk at time t = 1 after recoil of the central black hole (see text). In the dimensionless units of the model, the recoil has νkick = 65 and is inclined 45 degrees to the initial disk axis. This corresponds to 65% of the innermost orbital velocity. The pre-kick Keplerian orbital period is Pb = 2.28 at the radius Rb = 23.6 where νKep = νkick. The orbital period at the inner and outer boundaries of the initial disk are P = 0.63 and 7.0, respectively.


Powerful Flares from Recoiling Black Holes in Quasars astro-ph