3C 147

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3C 147
3C147-U4496201R.jpg
Hubble Legacy Archive WFPC2 image of 3C 147
Observation data (Epoch J2000)
ConstellationAuriga
Right ascension05h 42m 36.138s[1]
Declination+49° 51′ 07.23″[1]
Redshift0.545[1][2]
Distance5.1 billion light-years
(Light travel time)[2]
6.4 billion light-years
(present)[2]
TypeQuasar[3]
Core-Dominated[2]
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]

3C 147 is one of four primary calibrators used by the Very Large Array (along with 3C 48, , and 3C 286). Visibilities of all other sources are calibrated using observed visibilities of one of these four calibrators.[4]

See also[]

References[]

  1. ^ a b c d e f g "3C 147". SIMBAD. Centre de données astronomiques de Strasbourg. 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.
  4. ^ Witz, Stephan W. (4 December 2015). "Calibration and Flux Density Scale". National Radio Astronomy Observatory. Retrieved 15 May 2016.

External links[]

  • Wikisky image of 3C 147 (PGC 2355407)


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