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]
| 3C 20 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 00h 43m 08.84s[1] |
| Declination | +52° 03′ 33.8″[1] |
| Redshift | 0.174 |
| Distance | ~ 700 Mpc |
| Apparent magnitude (V) | 19[2] |
| Characteristics | |
| Type | E[1] |
| Apparent size (V) | 76.8 × 76.8 arcsec²[3] (radiogalaxy) |
| Other designations | |
| DA 22, LEDA 2817481, 3C 20 | |
References
edit- ^ a b c "NASA/IPAC Extragalactic Database". Results for QSO B1637+826. Retrieved 2006-10-26.
- ^ Simbad
- ^ www.jb.man.ac.uk/atlas/
- ^ 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.
- ^ 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
edit- ^ Calculated from apparent size and distance:
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