3C 20

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3C 20
Observation data (J2000 epoch)
ConstellationCassiopeia
Right ascension00h 43m 09.18s[1][2]
Declination+52° 03′ 36.15″[1][2]
Redshift0.174±0.001[3]
Heliocentric radial velocity52,164±300 km/s[3]
Galactocentric velocity52,352±300 km/s[3]
Distance2,501 ± 175.5 Mly (766.7 ± 53.8 Mpc)h−1
0.6774
(Comoving)[3]
2.213 Gly (678.5 Mpc)h−1
0.6774
(Light-travel)[3]
Apparent magnitude (V)19.0[3]
Apparent magnitude (B)19.0[2]
magnitude (J)16.368±0.112[4]
magnitude (H)15.582±0.126[4]
magnitude (K)14.756±0.115[4]
Characteristics
TypeNLRG[3]
Apparent size (V)76.8″ × 76.8″²[5] (radiogalaxy)
Other designations
DA 22, 3C 20, LEDA 2817481

3C 20 is a radio galaxy[6] located in the constellation Cassiopeia. It 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.[7]

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

References

[edit]
  1. ^ a b Chambers, K. C.; et al. (2017). "VizieR Online Data Catalog: The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)". Vizier Online Data Catalog. Bibcode:2017yCat.2349....0C.
  2. ^ a b c 3C 20
  3. ^ a b c d e f g 3C 020 on NASA/IPAC Extragalactic Database
  4. ^ a b c Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode:2003yCat.2246....0C.
  5. ^ www.jb.man.ac.uk/atlas/
  6. ^ 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.
  7. ^ 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.



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