6C B140400.6+405554

6C B140400.6+405554
SDSS image of 6C B140400.6+405554
Observation data (J2000.0 epoch)
ConstellationCanes Venatici
Right ascension14h 06m 04.08s[1]
Declination+40° 41′ 38.95″[1]
Redshift0.210916[1]
Heliocentric radial velocity63,231 ± 9 km/s[1]
Distance3,050.1 ± 213.5 Mly (935.16 ± 65.46 Mpc)
Group or clusterWHL J140604.0+404139
magnitude (K)13.90[1]
Characteristics
TypeBrClG[1]
Size~551,000 ly (168.8 kpc) (estimated)[1]
Other designations
2MASX J14060404+4041387, ASK 323191.0, LRG J140604.11+404140.2, LEDA 2169565, OGC 0642, SDSS J140604.03+404138.8, WHL J140604.0+404139 BCG[1]

6C B140400.6+405554 also known as OGC 642 and J140604.1+404140, is a radio galaxy located in the constellation of Canes Venatici. The redshift of the galaxy is (z) 0.210[1] and it was first discovered in the Sixth Cambridge Survey of Radio Sources in 1988 by astronomers.[2]

Description

6C B140400.6+405554 is an elliptical galaxy[3] residing as the brightest cluster galaxy of the WHL J140604.0+404139 galaxy cluster with 20 confirmed galaxy member candidates. The R-band magnitude of the galaxy is estimated to be 16.68 magnitude while absolute magnitude is -23.54.[4][5] The supermassive black hole lying in the center of the galaxy is found to be 8.77 M☉ although it has been suggested to be 8.76 M☉.[6][5]

The nucleus is found to be active and it has been classified as either a Fanaroff-Riley Class Type I radio galaxy or a bend-tail X-shaped radio galaxy with a Fanaroff-Riley Class Type II-like source.[6][7] Both of the radio lobes are resolved and they are shown to reach a maximum size of 84.28 kiloparsecs while the total log radio luminosity is found to be 26.07 W Hz−1.[6] It has also been classified as a narrow-angle-tail (NAT) radio galaxy. There are detected radio jets with the opening angle estimated as 64.3° while the curvature radius of these jets are 16.2 arcseconds. The largest angular size of the source is 48 arcseconds whereas the largest linear size is 171.0 kiloparsecs.[5] The radio flux density calculated by NRAO VLA Sky Survey (NVSS) is 261.00 mJy at 1.4 GHz frequencies while the radio spectral index is 0.98α.[7][5]

The optical spectrum of the galaxy has presence of both hydrogen-alpha and doubly ionized oxygen emission lines with estimated line luminosities of 7.367 and 7.018 L☉ respectively.[6] A study classified it as a C-shaped radio galaxy with a total radio luminosity of 25.58 W Hz−1 at 1.4 GHz frequencies and it has total extent of 0.13 megaparsecs.[8]

References

  1. 1 2 3 4 5 6 7 8 9 "NED Search results for 6C B140400.6+405554". NASA/IPAC Extragalactic Database. Retrieved 2026-06-26.
  2. ↑ Hales, S. E. G.; Baldwin, J. E.; Warner, P. J. (October 1988). "The 6C survey of radio sources - II. The zone 30 <delta<51, 08h30m <alpha<17h30m". Monthly Notices of the Royal Astronomical Society. 234: 919–936. Bibcode:1988MNRAS.234..919H. doi:10.1093/mnras/234.4.919.
  3. ↑ Ogle, Patrick M.; Lanz, Lauranne; Appleton, Philip N.; Helou, George; Mazzarella, Joseph (2019-07-15). "A Catalog of the Most Optically Luminous Galaxies at z < 0.3: Super Spirals, Super Lenticulars, Super Post-mergers, and Giant Ellipticals". The Astrophysical Journal Supplement Series. 243 (1): 14. arXiv:1904.02806. Bibcode:2019ApJS..243...14O. doi:10.3847/1538-4365/ab21c3. ISSN 1538-4365.
  4. ↑ Wen, Z. L.; Han, J. L.; Liu, F. S. (2012-03-30). "A Catalog of 132,684 Clusters of Galaxies Identified from Sloan Digital Sky Survey III". The Astrophysical Journal Supplement Series. 199 (2): 34. arXiv:1202.6424. Bibcode:2012ApJS..199...34W. doi:10.1088/0067-0049/199/2/34. ISSN 0067-0049.
  5. 1 2 3 4 Lao, Baoqiang; Andernach, Heinz; Yang, Xiaolong; Zhang, Xiang; Zhao, Rushuang; Zhao, Zhen; Yu, Yun; Sun, Xiaohui; Qin, Sheng-Li (2025-01-16). "Identification of 4876 Bent-tail Radio Galaxies in the FIRST Survey Using Deep Learning Combined with Visual Inspection". The Astrophysical Journal Supplement Series. 276 (2): 46. arXiv:2501.09883. Bibcode:2025ApJS..276...46L. doi:10.3847/1538-4365/ad9c6d. ISSN 0067-0049.
  6. 1 2 3 4 Sikora, Marek; Stasińska, Grażyna; Kozieł-Wierzbowska, Dorota; Madejski, Greg M.; Asari, Natalia V. (2013-02-15). "Constraining Jet Production Scenarios by Studies of Narrow-Line Radio Galaxies". The Astrophysical Journal. 765 (1): 62. arXiv:1210.2571. Bibcode:2013ApJ...765...62S. doi:10.1088/0004-637x/765/1/62. ISSN 0004-637X.
  7. 1 2 Ma, Zhixian; Xu, Haiguang; Zhu, Jie; Hu, Dan; Li, Weitian; Shan, Chenxi; Zhu, Zhenghao; Gu, Liyi; Li, Jinjin; Liu, Chengze; Wu, Xiangping (2019-02-01). "A Machine Learning Based Morphological Classification of 14,245 Radio AGNs Selected from the Best–Heckman Sample". The Astrophysical Journal Supplement Series. 240 (2): 34. arXiv:1812.07190. Bibcode:2019ApJS..240...34M. doi:10.3847/1538-4365/aaf9a2. ISSN 0067-0049.
  8. ↑ Liu, Yu-Xing; Xu, Hai-Guang; Zheng, Dong-Chao; Li, Wei-Tian; Zhu, Zheng-Hao; Ma, Zhi-Xian; Lian, Xiao-Li (2019-09-01). "The environment of C- and S-shaped radio galaxies". Research in Astronomy and Astrophysics. 19 (9): 127. Bibcode:2019RAA....19..127L. doi:10.1088/1674-4527/19/9/127. ISSN 1674-4527.
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