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5C 7.170

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5C 7.170
SDSS image of 5C 5.170
Observation data (J2000.0 epoch)
ConstellationCancer
Right ascension08h 21m 21.26s[1]
Declination+25° 19′ 03.11″[1]
Redshift0.267570[1]
Heliocentric radial velocity80,216 ± 16 km/s[1]
Distance3,869.7 ± 270.9 Mly (1,186.45 ± 83.05 Mpc)[1]
Group or clusterWHL J082121.3+251903
magnitude (J)15.92[1]
Characteristics
TypeBrClG[1]
Size~356,000 ly (109.0 kpc) (estimated)[1]
Other designations
2MASX J08212126+2519038, B2 0818+25, [BFS2025] J0821+2519, NVSS J082121+251903, RGZ J082121.2+251903, TONS08 0669, SDSS J082121.27+251903.0, WHL J082121.3+251903 BCG, LEDA 3523322

5C 7.170 also known as NYU-VAGC 1039773, is a radio galaxy located in the constellation of Cancer. The redshift of the galaxy is (z) 0.267[1] and it was first discovered as an astronomical radio source by astronomers with the Bologna Northern Cross Telescope in 1972 and designated as B2 0818+25.[2]

Description

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5C 7.170 is a narrow-line radio galaxy residing as the brightest cluster galaxy (BCG) of the WHL J082121.3+251903 galaxy cluster with 52 confirmed galaxy member candidates. The K-band magnitude of the galaxy is estimated to be 14.33 ± 0.01 while the R-band magnitude is 17.84. There is presence of narrow doubly ionized oxygen emission lines in its optical spectrum with line luminosities less than 33.68 Lʘ.[3][4] The spectrum also has singly ionized calcium and neutral magnesium emission lines.[5]

The central nucleus is categorized to be active and it is a Fanaroff-Riley Type II radio galaxy with a non-bend tail source whose total flux density is 127.90 mJy at 1.4 GHz frequencies by NRAO VLA Sky Survey (NVSS).[6] The total linear size of the source is estimated to be 97.1 kiloparsecs in extent with the logarithm radio luminosity of 25.19 WHz-1 sr-1.[7] The largest angular size of the radio structure is 45 arcseconds whereas the deprojected length is 184 kiloparsecs. There is a presence of a radio jet with its jet inclination angle being 90°. The volume of the radio lobes is 2.49 Vℓ × 1063 m3 while the spectral index is 0.892α.[8] Evidence found the source is mainly bent, with its bending angle measured to be 11.4° while the excess bending angle is 14.2°.[9]

A study found the stellar velocity dispersion of the galaxy is 280 kilometers per seconds. The effective radius of the galaxy is found to be 20.4 kiloparsecs.[10] In May 2025, it was classified as an X-shaped radio galaxy with its total radio power estimated as 2.64 × 1026 W Hz-1 and a total radio flux density of 1134.9 mJy at 144 MHz frequencies. Both the angular size and linear size of the source are 67 arcseconds and 285 kiloparsecs respectively.[11]

References

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  1. 1 2 3 4 5 6 7 8 9 "NED Search results for 5C 7.170". NASA/IPAC Extragalactic Database. Retrieved 2026-06-30.
  2. ↑ Colla, G.; Fanti, C. (September 1972). "The B2 Catalogue of radio sources - second part". Astronomy and Astrophysics Supplement. 7: 1. Bibcode:1972A&AS....7....1C.
  3. ↑ Willott, C. J.; Rawlings, S.; Jarvis, M. J.; Blundell, K. M. (2003-02-11). "Near-infrared imaging and the K--z relation for radio galaxies in the 7C Redshift Survey". Monthly Notices of the Royal Astronomical Society. 339 (1): 173–188. arXiv:astro-ph/0209439. Bibcode:2003MNRAS.339..173W. doi:10.1046/j.1365-8711.2003.06172.x. ISSN 0035-8711.
  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. ↑ Willott, Chris J.; Rawlings, Steve; Blundell, Katherine M.; Lacy, Mark; Hill, Gary J.; Scott, Susan E. (2002-05-29). "Optical spectroscopy of radio galaxies in the 7C Redshift Survey". Monthly Notices of the Royal Astronomical Society. 335 (4): 1120–1132. arXiv:astro-ph/0205507. Bibcode:2002MNRAS.335.1120W. doi:10.1046/j.1365-8711.2002.05718.x.
  6. ↑ 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.
  7. ↑ Wang, Yang; Kaiser, Christian R. (2008-08-01). "Cosmological evolution of the Fanaroff–Riley type II source population". Monthly Notices of the Royal Astronomical Society. 388 (2): 677–696. arXiv:0805.4541. Bibcode:2008MNRAS.388..677W. doi:10.1111/j.1365-2966.2008.13417.x. ISSN 0035-8711.
  8. ↑ Machalski, Jerzy; Kozieł-Wierzbowska, Dorota; Goyal, Arti (2021-07-27). "An Atlas of Dynamical Evolution Models of 361 Fanaroff–Riley Type II Radio Sources". The Astrophysical Journal Supplement Series. 255 (2): 22. Bibcode:2021ApJS..255...22M. doi:10.3847/1538-4365/ac08a0. ISSN 0067-0049.
  9. ↑ Garon, Avery F.; Rudnick, Lawrence; Wong, O. Ivy; Jones, Tom W.; Kim, Jin-Ah; Andernach, Heinz; Shabala, Stanislav S.; Kapińska, Anna D.; Norris, Ray P.; de Gasperin, Francesco; Tate, Jean; Tang, Hongming (2019-02-28). "Radio Galaxy Zoo: The Distortion of Radio Galaxies by Galaxy Clusters". The Astronomical Journal. 157 (3): 126. arXiv:1901.05480. Bibcode:2019AJ....157..126G. doi:10.3847/1538-3881/aaff62. ISSN 0004-6256.
  10. ↑ Lin, Yen-Ting; Shen, Yue; Strauss, Michael A.; Richards, Gordon T.; Lunnan, Ragnhild (2010-10-19). "ON THE POPULATIONS OF RADIO GALAXIES WITH EXTENDED MORPHOLOGY ATz< 0.3". The Astrophysical Journal. 723 (2): 1119–1138. arXiv:1006.5452. Bibcode:2010ApJ...723.1119L. doi:10.1088/0004-637x/723/2/1119. ISSN 0004-637X.
  11. ↑ Bera, Soumen Kumar; Fang, Taotao; Sasmal, Tapan K.; Kunert-Bajraszewska, M.; Chen, Xuelei; Mondal, Soumen (2025-05-15). "A Morphological Identification and Study of Radio Galaxies from LoTSS DR2. I. The "Winged" Radio Galaxies". The Astrophysical Journal Supplement Series. 278 (2): 34. arXiv:2604.22347. Bibcode:2025ApJS..278...34B. doi:10.3847/1538-4365/adc67f. ISSN 0067-0049.
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