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UGC 8669

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UGC 8669
SDSS image of UGC 8669.
Observation data (J2000.0 epoch)
ConstellationBoötes
Right ascension13h 41m 49.10s[1]
Declination+26° 22′ 21.01″[1]
Redshift0.075732[1]
Heliocentric radial velocity22,704 km/s[1]
Distance1.045 Gly
Group or clusterAbell 1775
Apparent magnitude (V)15.3
Characteristics
TypeElliptical;BrCLG[1]
Size~330,000 ly (100 kpc) (estimated)[1]
Notable featuresRadio galaxy
Other designations
VV 195b, MCG +05-32-063, CGCG 161-121 NED01, 2MASX J13414914+2622248, OGC 0935, KOS NP5 007, PGC 48495, 4C 26.41, B2 1339+26B

UGC 8669 known as UGC 8669 NED01 and B2 1339+26B, is a radio galaxy located in the constellation of Boötes. The redshift of the galaxy is estimated to be (z) 0.075[1] and it was first discovered by astronomers in 1971,[2] later designated as 4C 26.41 in 1977.[3] It is the brightest cluster galaxy (BCG), dominating the center of Abell 1775, an X-ray luminous and rich galaxy cluster.[4][5]

Description

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UGC 8669 is classified as a Fanaroff-Riley class Type I radio galaxy. Its host is an elliptical galaxy with a small dark nuclear band.[6] It is a giant double galaxy system pairing up with another elliptical galaxy UGC 8669 NED02[7] or B2 1339+26A, to collectively form VV 5-32-63/64.[8] The two nuclei of the system are estimated to display a radial velocity difference of 1700 kilometers per seconds with the separation of approximately 30 kiloparsecs from each other. The total mass of the system is 2 x 1013 Mʘ making it somehow larger comparing to the low limit of double galaxies located in clusters.[2] Both of the galaxies in the system display strong forms of isophotal twisting with ellipticity variations, suggestive of a collision.[9]

The galaxy has head-tail radio source with an extension of 380 kiloparsecs in extent.[10][11] When imaged with Very Large Array, it has a head component showing an innermost structure found detected as an off-centered nucleus with two radio jets on opposite symmetry. The northeast jet is straight in the path of the tail direction while the southwest jet mainly displays a bend at 0.7 kiloparsecs. There is a radio core located southwards from a bright hotspot.[12] The other galaxy B2 1339+26A has been classified as a double radio galaxy.[10]

Recent observations have showed the galaxy has an unexpected increase of surface brightness in some of the tail regions suggesting its jets display a complex bend. There was also evidence that the spectral index is rising in an unexpected manner for some of the regions ranging between 1.37 ± 0.14 and 0.88 ± 0.14. Because the regions are situated close to a fossil plasma filament with an ultra-steep spectrum, it is likely the radio emission is contaminating the galaxy.[13]

A tail extension has been discovered in the galaxy making the source longer with a collimated structure reaching up to 400 kiloparsecs, before breaking up and becoming diffused at the spot of a cold front. This might be suggested by dormant tail electrons displaying re-acceleration.[10]

References

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  1. ^ a b c d e f g "NED Search results for UGC 8869 NED01". NASA/IPAC Extragalactic Database. Retrieved 2025-09-01.
  2. ^ a b Chincarini, Guido; Rood, Herbert J.; Sastry, Gummuluru N.; Welch, Gary A. (August 1971). "A Supermassive Double Galaxy in the Cluster Abell 1775". The Astrophysical Journal. 168: 11. Bibcode:1971ApJ...168...11C. doi:10.1086/151055. ISSN 0004-637X.
  3. ^ Miley, G. K.; Harris, D. E. (November 1977). "Westerbork observations of three cluster radio galaxies". Astronomy and Astrophysics. 61: L23 – L26. Bibcode:1977A&A....61L..23M. ISSN 0004-6361.
  4. ^ Liuzzo, E.; Giovannini, G.; Giroletti, M.; Taylor, G. B. (2009-08-31), "The Bologna complete sample of nearby radio sources", Astronomy & Astrophysics, 505 (2): 509–520, arXiv:0908.4391, Bibcode:2009A&A...505..509L, doi:10.1051/0004-6361/200912586
  5. ^ Hu, Dan; Xu, Haiguang; Zhu, Zhenghao; Shan, Chenxi; Zhu, Yongkai; Fan, Shida; Zhao, Yuanyuan; Liu, Chengze; Siew, Hoongwah; Zhang, Zhongli; Gu, Liyi; Johnston-Hollitt, Melanie; Kang, Xi; Tan, Qinghua; Chang, Jiang (2021-05-01). "The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source". The Astrophysical Journal. 913 (1): 8. arXiv:2103.03382. Bibcode:2021ApJ...913....8H. doi:10.3847/1538-4357/abf09e. ISSN 0004-637X.
  6. ^ Capetti, A.; de Ruiter, H. R.; Fanti, R.; Morganti, R.; Parma, P.; Ulrich, M.-H. (October 2000). "The HST snapshot survey of the B2 sample of low luminosity radio-galaxies: a picture gallery". Astronomy and Astrophysics. 362: 871–885. arXiv:astro-ph/0009056. Bibcode:2000A&A...362..871C. ISSN 0004-6361.
  7. ^ "NED Search results for UGC 8669 NED02". NASA/IPAC Extragalactic Database. Retrieved 2025-09-01.
  8. ^ Hintzen, P. (August 1979). "VV 5-32-63/64 - The 'supermassive double galaxy' in Abell 1775 revisited". Publications of the Astronomical Society of the Pacific. 91: 426. doi:10.1086/130514. ISSN 0004-6280.
  9. ^ Hayes, J. J. E.; Bhattacharya, B. (November 1990). "The cD galaxy in Abell cluster 1775". NASA Conference Publication. 3098 (124): 195–199. Bibcode:1990NASCP3098..195H.
  10. ^ a b c Botteon, A.; Giacintucci, S.; Gastaldello, F.; Venturi, T.; Brunetti, G.; Weeren, R. J. van; Shimwell, T. W.; Rossetti, M.; Akamatsu, H.; Brüggen, M.; Cassano, R.; Cuciti, V.; Gasperin, F. de; Drabent, A.; Hoeft, M. (2021-05-01). "Nonthermal phenomena in the center of Abell 1775 - An 800 kpc head-tail, revived fossil plasma and slingshot radio halo" (PDF). Astronomy & Astrophysics. 649: A37. arXiv:2103.01989. Bibcode:2021A&A...649A..37B. doi:10.1051/0004-6361/202040083. ISSN 0004-6361.
  11. ^ Giacintucci, S.; Venturi, T.; Murgia, M.; Dallacasa, D.; Athreya, R.; Bardelli, S.; Mazzotta, P.; Saikia, D. J. (2007-10-02). "Radio morphology and spectral analysis of cD galaxies in rich and poor galaxy clusters" (PDF). Astronomy & Astrophysics. 476 (1): 99–119. arXiv:0708.4330. Bibcode:2007A&A...476...99G. doi:10.1051/0004-6361:20077918. ISSN 0004-6361.
  12. ^ Gregory, B. Terni de; Feretti, L.; Giovannini, G.; Govoni, F.; Murgia, M.; Perley, R. A.; Vacca, V. (2017-12-01). "Narrow head-tail radio galaxies at very high resolution". Astronomy & Astrophysics. 608: A58. arXiv:1709.00223. Bibcode:2017A&A...608A..58T. doi:10.1051/0004-6361/201730878. ISSN 0004-6361.
  13. ^ Bushi, A.; Botteon, A.; Dallacasa, D.; Weeren, R. J. van; Venturi, T.; Brüggen, M.; Gastaldello, F.; Giacintucci, S. (2025-02-01). "The head-tail radio galaxy and revived fossil plasma in Abell 1775". Astronomy & Astrophysics. 694: A317. arXiv:2502.04913. Bibcode:2025A&A...694A.317B. doi:10.1051/0004-6361/202453391. ISSN 0004-6361.
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