Cygnus A


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Cygnus A

An intense radio source in Cygnus that has a flux density at 178 megahertz of 8100 jansky. It is a typical double radio source (see illustration at radio-source structure) and is identified with a 16-magnitude radio galaxy; a narrow radio jet connects the central galaxy to the NW lobe. The galaxy has a redshift of 0.057, indicating a distance of about 230 megaparsecs, and a spectral index of –0.8 below 1 GHz. It is the brightest low-redshift radio source, with a radio luminosity more typical of very distant radio galaxies (those above a redshift of one).

The galaxy is at the center of a cooling flow cluster (see clusters of galaxies), and its optical spectrum is rich in forbidden emission lines. It also contains a polarized blue continuum that is due to scattered light from a hidden quasar nucleus.

Cygnus A

[′sig·nəs ′ā]
(astronomy)
A strong, discrete radio source in the constellation Cygnus, associated with two spiral galaxies in collision.
References in periodicals archive ?
But scientists have now confirmed that one of these brilliant beacons resides at the heart of Cygnus A, a galaxy just 600 million light-years away.
She and her colleagues analyzed the spectra of ultraviolet light recorded by the Hubble Space Telescope to confirm that a quasar lies at the center of Cygnus A, the brightest radio galaxy in the northern sky.
Those radio galaxies seen edge on, including Cygnus A, appear to emit only narrow bands of visible light.
But the spectra of visible light reflected from the core of Cygnus A have no such pattern, casting doubt on whether the galaxy truly harbors a quasar.
the researchers photographed Cygnus A at four successively longer near-infrared wavelengths -- each penetrating the dust more deeply than the last.
According to Djorgovski, this all but proves that the core of Cygnus A harbors a quasar.
He and his colleagues describe the Cygnus A data in the May 10 ASTROPHYSICAL JOURNAL LETTERS.
He brings to Cygnus a strategic approach to organizational planning and development, useful in managing future growth at Cygnus.
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Cary held many positions which have given him a breadth of operating experience which will be valuable to Cygnus as we make the transition from an R&D company to a fully integrated business.
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