3C 20

3C 20
3C 20
Observation data (J2000 epoch)
Constellation	Cassiopeia
Right ascension	00h 43m 09.18s
Declination	+52° 03′ 36.15″
Redshift	0.174±0.001
Heliocentric radial velocity	52,164±300 km/s
Galactocentric velocity	52,352±300 km/s
Distance	2,501 ± 175.5 Mly (766.7 ± 53.8 Mpc)h−1; 0.6774; (Comoving) ; 2.213 Gly (678.5 Mpc)h−1; 0.6774; (Light-travel)
Apparent magnitude (V)	19.0
Apparent magnitude (B)	19.0
Magnitude (J)	16.368±0.112
Magnitude (H)	15.582±0.126
Magnitude (K)	14.756±0.115
Characteristics
Type	NLRG
Apparent size (V)	76.8″ × 76.8″² (radiogalaxy)
Other designations
	DA 22, 3C 20, LEDA 2817481

3C 20 is a radio galaxy 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.

References

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.
1 2 3 3C 20
1 2 3 4 5 6 7 3C 020 on NASA/IPAC Extragalactic Database
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.
↑ 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.

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[chambers-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.

[SIMBAD-2] 1 2 3 3C 20

[ned-3] 1 2 3 4 5 6 7 3C 020 on NASA/IPAC Extragalactic Database

[cutri-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/

[Hiltner-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.