3C 20

Radio galaxy in the constellation Cassiopeia
3C 20
Observation data (J2000 epoch)
ConstellationCassiopeia
Right ascension00h 43m 08.84s[1]
Declination+52° 03′ 33.8″[1]
Redshift0.174
Distance~ 700 Mpc
Apparent magnitude (V)19[2]
Characteristics
TypeE[1]
Apparent size (V)76.8 × 76.8 arcsec²[3] (radiogalaxy)
Other designations
DA 22, LEDA 2817481, 3C 20

3C 20 is a radio galaxy[4] located in the constellation Cassiopeia. It is one of largest known galaxies with a diameter of 850,000 ly (260 kpc).[a] The galaxy features a prominent double hotspot in its eastern lobe. An unusually low fraction of the flux lies within the radio core, which is suggested to be caused by a combination of factors, including jet orientation, synchrotron self-absorption and aging, as well as interactions with surrounding gas and dust.[5]

A radio image of 3C 20 at 0.22 arc-sec resolution.

References

  1. ^ a b c "NASA/IPAC Extragalactic Database". Results for QSO B1637+826. Retrieved 2006-10-26.
  2. ^ Simbad
  3. ^ www.jb.man.ac.uk/atlas/
  4. ^ Hiltner, P. R.; Meisenheimer, K.; Roeser, H. J.; Laing, R. A.; Perley, R. A. (1994). "Hot SPOT 3C20 west: an optical synchrotron source". Astronomy and Astrophysics. 286: 25–36. Bibcode:1994A&A...286...25H.
  5. ^ Hardcastle, M. J.; Alexander, P.; Pooley, G. G.; Riley, J. M. (1997-07-11). "High-resolution observations at 3.6 cm of seventeen FR II radio galaxies with 0.15". Monthly Notices of the Royal Astronomical Society. 288 (4): 859–890. doi:10.1093/mnras/288.4.859. ISSN 0035-8711.

Notes

  1. ^ Calculated from apparent size and distance: 700 M p c ∗ s i n ( 76.8 a r c s e c ) = 850 , 000 l y {\displaystyle 700Mpc*sin(76.8arcsec)=850,000ly}


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