Radio Galaxies
A particular type of active galaxy that emits more light at radio wavelengths than at visible wavelengths, also known as a radio-luminous galaxy or radio-loud galaxy. Radio galaxies are driven by non-thermal emission.
Radio galaxies are active galaxies that emit most of their energy in the radio part of the spectrum. They are generally comparable to the Seyferts in total energy output. Unlike Seyferts, they are usually associated with elliptical galaxies.
Radio galaxies were found as the optical counterparts of radio sources from early surveys - see Matthews, Morgan, and Schmidt 1964 (ApJ 140, 35).
RADIO GALAXIES
Radio galaxies are usually elliptical or elliptical-like galaxies that are strong sources of radio sychrotron emission (emission produced by electrons moving nearly at the speed of light while spiraling around magnetic field lines).
Radio galaxies
Most galaxies probably emit radio waves and do so at energies comparable to that of our own galaxy-about 1032 W. In the cases of the so-called radio galaxies, however, the radio emission is up to 100 million times stronger.
Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths (up to 1038 W between 10 MHz and 100 GHz). The radio emission is due to the synchrotron process.
Radio galaxies, as their name implies, are strong emitters of radio emission. These are elliptical galaxies with nuclear radio emission, often accompanied by single or twin radio lobes (straddling the galaxy) that can be Mpc-sized.
Radio galaxies. These objects show nuclear and extended radio emission. Their other AGN properties are heterogeneous. They can broadly be divided into low-excitation and high-excitation classes ().
Radio galaxies
Galaxies which are extremely powerful emitters of radio radiation.
Red shift ...
Radio galaxies can come in a variety of shapes - they can be spirals or ellipticals, though it seems that the most extreme ones tend to be ellipticals.
"Spiral-host large radio galaxies are rare, likely because gaseous discs, capable of forming stars, ...
radio jets (astronomy) (NASA Thesaurus) Jets of energetic particles occurring in radio galaxies and quasars usually emitted from the nuclear (active) region of the extragalactic radio source.
Radio galaxies belong to the former class, and quasars (short for "quasi-stellar radio sources") to the latter.
The impact of double black holes and radio galaxies in the Milky Way PhysOrg - January 4, 2011
Radio galaxies beam as much as one trillion solar-luminosities of radiation into space at radio wavelengths.
AGN are found at the heart of active galaxies, including quasars, Seyfert galaxies, blazars, and radio galaxies. In addition to their great energy output, they can be highly variable.
Finally, there is evidence that the normal double quasars and broadline radio galaxies that lie very close to the sky plane are observed and classified as narrow-line radio galaxies, at least in some cases.
They found strange radio structures on opposite sides of radio galaxies, plus a tiny source of radio emission at the nucleus.
Of those optically identified radio sources, roughly one third are quasars, and the remainder are radio galaxies. In addition to these localized radio sources, there is uniform low-level radio noise from every direction in the sky.
BL Lacertae objects are radio galaxies characterized by rapidly varying luminosity, no emission lines in the spectrum, and point-like appearance. As with blazars, they are aligned so that their plasma jets point in our direction.
Radio galaxies and supernova remnants are intense sources of synchrotron radiation. Characteristics of synchrotron radiation are its high degree of polarization and nonthermal spectrum. (sometimes called magnetic bremsstrahlung) [Silk90] ...
'Radio galaxies' of this type are often very luminous in visible light meaning they can be seen by optical telescopes at large distances.
Supernovae
Quasars
Radio galaxies
Groups and clusters of galaxies
See also Galaxy formation and evolution ...
These jets emerge from the cores of radio galaxies and can extend outward across regions of space larger than the size of the galaxy itself.
Any of a class of galaxies whose luminosity is greatest in radio wavelengths. Radio galaxies are usually large elliptical galaxies, with synchrotron radiation emitted from one or more pairs of lobes located on opposite sides of the visible galaxy.
Gas escaping along the magnetic field would produce the beams of electrons and gas seen in the jets to make the radio lobes of radio galaxies. Also, the shape of the accretion disk may play a role in directing the gas into the jets.
In any case, at the present time, this accreting-black-hole model is accepted as an explanation for the behavior of quasars, radio galaxies, and blazars, known collectively as active galactic nuclei (AGNs), ...
blazars a class of active galaxies that exhibit rapidly variable emission from the radio through gamma-ray band. The radiation is predominantly from jets moving near the speed of light. Blazars are thought to be radio galaxies with their jets ...
active galaxies
Energetic galaxies that release huge amounts of energy, mostly in the form of long-wavelength radiation. The two most common types are Seyfert galaxies and Radio galaxies.
Approximately 14 light-years distant, it is one of the closest radio galaxies (active galaxies that are very luminous at radio wavelengths) to Earth.
Active galactic nuclei are believed to contain supermassive black holes that power the nonstellar phenomena associated with active galaxies. Examples of active galaxies include: Seyfert galaxies, Radio galaxies (image), and BL Lac objects.
 See also: Galaxies, Galaxy, Emission, Time, Light
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