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 ?
With Digimind Social, organizations have the assurance of 850 million online data sources, integrated with more than 2,000 TV and radio sources to provide the only comprehensive depiction of its brand reputation, consumer insights, and market trends in one place.
Title: The luminosity function and clustering of mJy radio sources at 0.
If we point the antenna towards the strongest radio source, which is the Sun (T [approximately equal to] 6000 K), taking into account that the angle subtended by the Sun if seen from Earth is 0.
A radio source said: "She wants control over all her radio and TV interviews and demanded they were pre-recorded so she can cut out the bits she doesn't like.
Five hours after BeppoSAX detected the burst, the James Clerk Maxwell telescope atop Hawaii's Mauna Kea recorded a submillimeter radio source at the location of the burst.
uk - found that few people from the ethnic minorities listen to BBC stations, and the BBC Asian Network was dismissed by one radio source as: "The English idea of what the Asians want.
Using a DF antenna, an operator could measure the angle of entry of a radio signal bouncing off the ionosphere and pinpoint the distance to the radio source.
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.
Our local black hole is located in a region known as Sagittarius A - Sgr A - after a nearby radio source.
A radio source said: "Everyone at the school was so excited that Will Young was going to be there, especially the children.
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.