radio source


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radio source

A celestial object whose radio emissions may be detected with a radio telescope. Within our Solar System these sources include Jupiter and the Sun, both of which emit powerful radio bursts. Galactic radio sources include pulsars, supernova remnants, H I and H II regions, maser sources, and the galactic center itself. Synchrotron emission from cosmic rays in the Galaxy gives rise to a diffuse background radiation, centered broadly on the galactic plane but having several spurs away from it (see interstellar medium). This background radiation may limit the sensitivity of a radio telescope, especially at frequencies below about 400 megahertz.

Extragalactic radio sources include spiral galaxies (whose H I and carbon monoxide emissions may be used to map the distribution of hydrogen within them), radio galaxies, and quasars. An extragalactic radio source is often classified according to the spatial distribution of the radio emission shown on a radio map of the source. See radio-source spectrum; radio-source structure.

radio source

[′rād·ē·ō ‚sȯrs]
(astrophysics)
A source of extragalactic or interstellar electromagnetic emission in radio wavelengths.
References in periodicals archive ?
Figure 9 shows the expected graphical standard response of any strong radio source like the Sun, the Moon or the Galaxy while slowly horizontally crossed by the antenna main beam.
The faint, persistent radio source could be the shock wave from the original supernova explosion.
Our local black hole is located in a region known as Sagittarius A - Sgr A - after a nearby radio source. It has a mass about four million times that of our Sun and lies around 26 000 light-years away from the Solar System.
Moreover, this change in speed is directed toward a compact radio source, called Sagittarius A*, that lies at the presumed location of the black hole.
Bolton had a radio telescope that was capable of locating a radio source with sufficient precision to associate it with an object that could be identified optically.
All his ratings are doing is plummeting & that can't continue RADIO SOURCE yesterday
The first quasar, short for "quasi-stellar radio source," was discovered 50 years ago this month by Caltech astronomer Mrten Schmidt.
It was used in the detection of radio noise from the Great Nebula in Andromeda -the first time that a kno wn extra galactic radio source had been detected.
A radio source in Cygnus was unusually strong, and optical investigation of the region revealed a peculiarly shaped galaxy that looked rather like two galaxies undergoing a collision.
This was the name of the compact radio source detected at the black hole's position; the * emphasizes its unusual nature.
Quasar - a quasi-stellar radio source - is a compact region surrounding a galaxy's supermassive black hole, heated to such an extent that it emits massive amounts of energy and can even outshine the galaxy in which it resides.
The central radio source was previously known and has a flat radio spectrum, typical of giant radio galaxies.