3C 147

From Wikipedia, the free encyclopedia
Jump to: navigation, search
3C 147
Hubble Legacy Archive WFPC2 image of 3C 147
Observation data (Epoch J2000)
Constellation Auriga
Right ascension 05h 42m 36.138s[1]
Declination +49° 51′ 07.23″[1]
Redshift 0.545[1][2]
Distance 5.1 billion light-years
(Light travel time)[2]
6.4 billion light-years
Type Quasar[3]
Seyfert 1[1][2]
Apparent magnitude (V) 17.8[1][2]
Other designations
PGC 2355407, 2E 1506, 2MASS J05423614+4951071, QSO B0538+498[1]
See also: Quasar, List of quasars

3C 147 (B0538+498) is a compact steep-spectrum (CSS) quasar[3] that was discovered in 1964. It is located in the constellation Auriga not far in the sky from the 5th magnitude star Omicron Aurigae.

The "distance" of a far away galaxy depends on what distance measurement you use. With a redshift of 0.545,[1][2] light from this active galaxy is estimated to have taken around 5.1 billion years to reach us.[2] But as a result of the expansion of the Universe, the present (co-moving) distance to this galaxy is about 6.4 billion light-years (1974 Mpc).[2]

Very Long Baseline Array (VLBA) observations have identified a complex central region that is dominated by two bright components, A and B.[3] The separation between the two central components of the source seems to be increasing with an apparent velocity (superluminal motion) of 1.2 ± 0.4 c.[3]


  1. ^ a b c d e f g "3C 147". SIMBAD Astronomical Database. Retrieved 2010-04-21. 
  2. ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for 3C 147. Retrieved 2010-04-21. 
  3. ^ a b c d Rossetti, A.; Mantovani; Dallacasa; Junor; Salter; Saikia (2009). "VLBA polarimetric observations of the CSS quasar 3C 147". Astronomy & Astrophysics 504 (3): 741–749. arXiv:0910.2146. Bibcode:2009A&A...504..741R. doi:10.1051/0004-6361/200811190. 

External links[edit]

  • Wikisky image of 3C 147 (PGC 2355407)