Cygnus A
(3C 405, QSO B1957+405)
(early-discovered radio galaxy showing a quasar)
Cygnus A (i.e., 3C 405 or QSO B1957+405) is a radio galaxy,
one of the first identified. As a radio source, it was discovered
by Grote Reber in 1938, with his back-yard radio telescope, the
first radio receiver built for that purpose. An apparent
quasar was discovered within it in the 1990s: this is no mystery
since quasars are interpreted as active galactic nuclei (AGNs), which are also often
the driver for strong radio emission from galaxies. Cygnus
A demonstrates the involvement of jets in creating a radio
galaxy's radio emission; its strongest radio signal comes from two
regions in opposite directions from the galaxy itself.
(galaxy,radio,quasar,jet)
Further reading:
https://en.wikipedia.org/wiki/Cygnus_A
https://hubblesite.org/contents/news-releases/1994/news-1994-42.html
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cygnus+A
Redshift | Parsecs /Distance | Lightyears /Lookback Years | | |
.056 | 232Mpc | 757Mly | | Cygnus A |
|
Coordinates: | 3C 405 J195928.3566+404402.096 |
|
Referenced by page:
quasar (QSO)
Index