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- Q1147716 subject Q10662.
- Q1147716 subject Q7282341.
- Q1147716 subject Q7282778.
- Q1147716 subject Q8209347.
- Q1147716 abstract "Cygnus A (3C 405) is a radio galaxy, and one of the strongest radio sources in the sky. It was discovered by Grote Reber in 1939. In 1951, Cygnus A, along with Cassiopeia A, and Puppis A were the first "radio stars" identified with an optical source. Of these, Cygnus A became the first radio galaxy; the other two being nebulae inside the Milky Way. In 1953 Roger Jennison and M K Das Gupta showed it to be a double source. Like all radio galaxies, it contains an active galactic nucleus.Images of the galaxy in the radio portion of the electromagnetic spectrum show two jets protruding in opposite directions from the galaxy's center. These jets extend many times the width of the portion of the host galaxy which emits radiation at visible wavelengths. At the ends of the jets are two lobes with "hot spots" of more intense radiation at their edges. These hot spots are formed when material from the jets collides with the surrounding intergalactic medium.Cygnus A appears in Carl Sagan's Contact as the result of beings actively creating a galaxy.".
- Q1147716 thumbnail 3c405.jpg?width=300.
- Q1147716 wikiPageExternalLink text.
- Q1147716 wikiPageExternalLink cyga.html.
- Q1147716 wikiPageExternalLink sim-id?protocol=html&Ident=Cygnus+A&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id.
- Q1147716 wikiPageExternalLink nph-bib_query?1994Natur.367..713H&db_key=AST.
- Q1147716 wikiPageExternalLink p7bb.htm.
- Q1147716 wikiPageExternalLink sim-id.pl?protocol=html&Ident=cygnus+a&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0.
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- Q1147716 name "Cygnus A".
- Q1147716 names "4".
- Q1147716 type Place.
- Q1147716 type CelestialBody.
- Q1147716 type Galaxy.
- Q1147716 type Location.
- Q1147716 type Place.
- Q1147716 type Thing.
- Q1147716 type Q318.
- Q1147716 comment "Cygnus A (3C 405) is a radio galaxy, and one of the strongest radio sources in the sky. It was discovered by Grote Reber in 1939. In 1951, Cygnus A, along with Cassiopeia A, and Puppis A were the first "radio stars" identified with an optical source. Of these, Cygnus A became the first radio galaxy; the other two being nebulae inside the Milky Way. In 1953 Roger Jennison and M K Das Gupta showed it to be a double source.".
- Q1147716 label "Cygnus A".
- Q1147716 depiction 3c405.jpg.
- Q1147716 name "4C40.40,2E4309, CYG A,W57,BWE1957+4035,NRAO620,1C19.01,QSOB1957+405,3C405,1RXSJ195928.7+404405,3C405.0,2U1957+40,3CR405,LEDA63932,4U1957+40,VV2000cJ195928.3+404402,DA500,MCG+07-41-003,DB117,Mills19+4,VV72.".
- Q1147716 name "Cygnus A".