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3C 20

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Radio galaxy in the constellation Cassiopeia
3C 20
Observation data (J2000 epoch)
Constellation Cassiopeia
Right ascension 00h 43m 09.18s[1] [2]
Declination +52°03′36.15′′[1] [2]
Redshift 0.174±0.001[3]
Heliocentric radial velocity 52,164±300km/s [3]
Galactocentric velocity52,352±300km/s [3]
Distance 2,501±175.5Mly (766.7±53.8Mpc)h−1
0.6774
(Comoving)[3]
2.213Gly (678.5Mpc)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
Type NLRG[3]
Apparent size(V)76.8′′ ×ばつ 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. 1 2 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. 1 2 3 3C 20
  3. 1 2 3 4 5 6 7 3C 020 on NASA/IPAC Extragalactic Database
  4. 1 2 3 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年07月11日). "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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