Doppler beaming

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• Doppler — Contents 1 Doppler effect and its applications 2 People 3 Other 4 …   Wikipedia

• Doppler radar — Doppler effect A Doppler radar is a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection …   Wikipedia

• Relativistic beaming — Doppler beaming redirects here. For other uses named for Christian Doppler, see Doppler (disambiguation). Only a single jet is visible in M87. Two jets are visib …   Wikipedia

• Relativistic Doppler effect — The relativistic Doppler effect is the change in frequency (and wavelength) of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect), when taking into account effects of the special theory of… …   Wikipedia

• Astrophysical maser — An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum. This emission may arise in molecular clouds, comets, planetary atmospheres, stellar… …   Wikipedia

• Blazar — A blazar is a very compact and highly variable energy source associated with a presumed supermassive black hole at the center of a host galaxy. Blazars are among the most violent phenomena in the universe and are an important topic in… …   Wikipedia

• Relativistic aberration — is described by Einstein s special theory of relativity, and in other relativistic models such as Newtonian emission theory. It describes aberration of light due to objects moving at relativistic speeds] and is described by the following formula …   Wikipedia

• Gamma ray burst emission mechanisms — are theories that explain how the energy from a gamma ray burst progenitor (regardless of the actual nature of the progenitor) is turned into radiation. These mechanisms are a major topic of research as of 2007. Neither the light curves nor the… …   Wikipedia

• Look-down/shoot-down — is a capability a radar system is said to possess if it is able to detect, track and lock a target moving below the horizon as seen by the radar. Look down/shoot down capability is an essential feature of modern airborne military radar systems.… …   Wikipedia

• Radio — is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of… …   Wikipedia

• Quasar — This article is about the astronomical object. For other uses, see Quasar (disambiguation). Artist s rendering of ULAS J1120+0641, a very distant quasar powered by a black hole with a mass two billion times that of the Sun[1]. Credit: ESO/M.… …   Wikipedia