3C 48

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3C 48
Radio map of quasar 3C48.jpg
Observation data (Epoch J2000)
Constellation Triangulum
Right ascension 01h 37m 41.1s[1]
Declination +33° 09′ 32″[1]
Redshift 110,024 ± 0 km/s[1]
Distance 3.9 billion light-years
(Light travel time)[1]
4.5 billion light-years
Type E[2]
Apparent dimensions (V) 0.6´X0.5´
Apparent magnitude (V) 16.2
Notable features First quasar discovered
Other designations
PG 0134+329, QSO B0134+329
See also: Quasar, List of quasars

3C48 was the first of many faint, starlike quasi-stellar objects which later were named quasars.[3]

3C48 was the first source in the Third Cambridge Catalogue of Radio Sources for which an optical identification was found by Allan Sandage and Thomas Matthews in 1960 through interferometry.[4] Jesse Greenstein and Thomas Matthews found that it had a redshift of 0.367, making it one of the highest redshift sources then known.[5] It was not until 1982 that the surrounding faint galactic "nebulosity" was confirmed to have the same redshift as 3C48, cementing its identification as an object in a distant galaxy.[6] This was also the first solid identification of a quasar with a surrounding galaxy at the same redshift.


  1. ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for 3C 48. Retrieved 2006-10-26. 
  2. ^ Simbad
  3. ^ Weaver, Kenneth F. (May 1974). "The Incredible Universe". National Geographic (Vol. 145 No. 5): 589–633. 
  4. ^ Matthews, Thomas A.; Sandage, Allan R. (1963). "Optical Identification of 3c 48, 3c 196, and 3c 286 with Stellar Objects". Astrophysical Journal 138: 30–56. Bibcode:1963ApJ...138...30M. doi:10.1086/147615. 
  5. ^ Greenstein, J. L.; Matthews, T. A. (1963). "Red-Shift of the Unusual Radio Source 3C48". Nature 197 (4872): 1041–1042. Bibcode:1963Natur.197.1041G. doi:10.1038/1971041a0. 
  6. ^ Todd A. Boroson & Oke, J. B. (1982). "Detection of the underlying galaxy in the QSO 3C48". Nature 296 (5856): 397–399. Bibcode:1982Natur.296..397B. doi:10.1038/296397a0.