3C 48
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| 3C 48 | |
|---|---|
 |
|
| 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] 0.367[1] |
| Distance | 3.9 billion light-years (Light travel time)[1] 4.5 billion light-years (present)[1] |
| 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.
[edit] References
- ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for 3C 48. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=3C+48&extend=no. Retrieved 2006-10-26.
- ^ Simbad
- ^ Weaver, Kenneth F. (May 1974). "The Incredible Universe". National Geographic (Vol. 145 No. 5): 589–633.
- ^ 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.
- ^ 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.
- ^ 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.
