# UGC 8669

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Radio galaxy located in the constellation Boötes

UGC 8669 SDSS image of UGC 8669. Observation data (J2000.0 epoch) Constellation Boötes Right ascension 13h 41m 49.10s[1] Declination +26° 22′ 21.01″[1] Redshift 0.075732[1] Heliocentric radial velocity 22,704 km/s[1] Distance 1.045 Gly Group or cluster Abell 1775 Apparent magnitude (V) 15.3 Characteristics Type Elliptical;BrCLG[1] Size ~330,000 ly (100 kpc) (estimated)[1] Notable features Radio 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](/source/Radio_galaxy) located in the constellation of [Boötes](/source/Bo%C3%B6tes). The [redshift](/source/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](/source/Brightest_cluster_galaxy) (BCG), dominating the center of Abell 1775, an [X-ray](/source/X-ray) luminous and rich [galaxy cluster](/source/Galaxy_cluster).[4][5]

## Description

UGC 8669 is classified as a [Fanaroff-Riley class](/source/Fanaroff%E2%80%93Riley_classification) Type I radio galaxy. Its host is an [elliptical galaxy](/source/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](/source/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 × 1013 [M☉](/source/Solar_mass) 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](/source/Galaxy) twisting with [ellipticity](/source/Flattening) variations, suggestive of a collision.[9]

The galaxy has head-tail [radio source](/source/Astronomical_radio_source) with an extension of 380 [kiloparsecs](/source/Parsec) in extent.[10][11] When imaged with [Very Large Array](/source/Very_Large_Array), it has a head component showing an innermost structure found detected as an off-centered nucleus with two [radio jets](/source/Astrophysical_jet) on opposite [symmetry](/source/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](/source/Surface_brightness) in some of the tail regions suggesting its jets display a complex bend. There was also evidence that the [spectral index](/source/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](/source/Plasma_(physics)) filament with an ultra-steep [spectrum](/source/Spectrum), it is likely the [radio emission](/source/Radio_wave) is contaminating the galaxy.[13]

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

## References

1. ^ [***a***](#cite_ref-ned_1-0) [***b***](#cite_ref-ned_1-1) [***c***](#cite_ref-ned_1-2) [***d***](#cite_ref-ned_1-3) [***e***](#cite_ref-ned_1-4) [***f***](#cite_ref-ned_1-5) [***g***](#cite_ref-ned_1-6) ["NED Search results for UGC 8869 NED01"](https://ned.ipac.caltech.edu/byname?objname=LEDA+48495&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2025-09-01.

1. ^ [***a***](#cite_ref-:1_2-0) [***b***](#cite_ref-:1_2-1) Chincarini, Guido; Rood, Herbert J.; Sastry, Gummuluru N.; Welch, Gary A. (August 1971). ["A Supermassive Double Galaxy in the Cluster Abell 1775"](https://articles.adsabs.harvard.edu/pdf/1971ApJ...168...11C). *The Astrophysical Journal*. **168**: 11. [Bibcode](/source/Bibcode_(identifier)):[1971ApJ...168...11C](https://ui.adsabs.harvard.edu/abs/1971ApJ...168...11C). [doi](/source/Doi_(identifier)):[10.1086/151055](https://doi.org/10.1086%2F151055). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-3)** Miley, G. K.; Harris, D. E. (November 1977). ["Westerbork observations of three cluster radio galaxies"](https://ui.adsabs.harvard.edu/abs/1977A&A....61L..23M/abstract). *Astronomy and Astrophysics*. **61**: L23–L26. [Bibcode](/source/Bibcode_(identifier)):[1977A&A....61L..23M](https://ui.adsabs.harvard.edu/abs/1977A&A....61L..23M). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-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](/source/ArXiv_(identifier)):[0908.4391](https://arxiv.org/abs/0908.4391), [Bibcode](/source/Bibcode_(identifier)):[2009A&A...505..509L](https://ui.adsabs.harvard.edu/abs/2009A&A...505..509L), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/200912586](https://doi.org/10.1051%2F0004-6361%2F200912586)

1. **[^](#cite_ref-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"](https://doi.org/10.3847%2F1538-4357%2Fabf09e). *The Astrophysical Journal*. **913** (1): 8. [arXiv](/source/ArXiv_(identifier)):[2103.03382](https://arxiv.org/abs/2103.03382). [Bibcode](/source/Bibcode_(identifier)):[2021ApJ...913....8H](https://ui.adsabs.harvard.edu/abs/2021ApJ...913....8H). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/abf09e](https://doi.org/10.3847%2F1538-4357%2Fabf09e). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-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](/source/ArXiv_(identifier)):[astro-ph/0009056](https://arxiv.org/abs/astro-ph/0009056). [Bibcode](/source/Bibcode_(identifier)):[2000A&A...362..871C](https://ui.adsabs.harvard.edu/abs/2000A&A...362..871C). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-7)** ["NED Search results for UGC 8669 NED02"](https://ned.ipac.caltech.edu/byname?objname=UGC+8669+NED02&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2025-09-01.

1. **[^](#cite_ref-8)** Hintzen, P. (August 1979). ["VV 5-32-63/64 - The 'supermassive double galaxy' in Abell 1775 revisited"](https://iopscience.iop.org/article/10.1086/130514/pdf). *Publications of the Astronomical Society of the Pacific*. **91**: 426. [doi](/source/Doi_(identifier)):[10.1086/130514](https://doi.org/10.1086%2F130514). [ISSN](/source/ISSN_(identifier)) [0004-6280](https://search.worldcat.org/issn/0004-6280).

1. **[^](#cite_ref-9)** Hayes, J. J. E.; Bhattacharya, B. (November 1990). ["The cD galaxy in Abell cluster 1775"](https://articles.adsabs.harvard.edu//full/1990NASCP3098..195H/0000199.000.html). *NASA Conference Publication*. **3098** (124): 195–199. [Bibcode](/source/Bibcode_(identifier)):[1990NASCP3098..195H](https://ui.adsabs.harvard.edu/abs/1990NASCP3098..195H).

1. ^ [***a***](#cite_ref-:0_10-0) [***b***](#cite_ref-:0_10-1) [***c***](#cite_ref-:0_10-2) 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"](https://www.aanda.org/articles/aa/pdf/2021/05/aa40083-20.pdf) (PDF). *Astronomy & Astrophysics*. **649**: A37. [arXiv](/source/ArXiv_(identifier)):[2103.01989](https://arxiv.org/abs/2103.01989). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...649A..37B](https://ui.adsabs.harvard.edu/abs/2021A&A...649A..37B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202040083](https://doi.org/10.1051%2F0004-6361%2F202040083). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-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"](https://www.aanda.org/articles/aa/pdf/2007/46/aa7918-07.pdf) (PDF). *Astronomy & Astrophysics*. **476** (1): 99–119. [arXiv](/source/ArXiv_(identifier)):[0708.4330](https://arxiv.org/abs/0708.4330). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...476...99G](https://ui.adsabs.harvard.edu/abs/2007A&A...476...99G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20077918](https://doi.org/10.1051%2F0004-6361%3A20077918). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-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"](https://www.aanda.org/articles/aa/abs/2017/12/aa30878-17/aa30878-17.html). *Astronomy & Astrophysics*. **608**: A58. [arXiv](/source/ArXiv_(identifier)):[1709.00223](https://arxiv.org/abs/1709.00223). [Bibcode](/source/Bibcode_(identifier)):[2017A&A...608A..58T](https://ui.adsabs.harvard.edu/abs/2017A&A...608A..58T). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201730878](https://doi.org/10.1051%2F0004-6361%2F201730878). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-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"](https://www.aanda.org/articles/aa/abs/2025/02/aa53391-24/aa53391-24.html). *Astronomy & Astrophysics*. **694**: A317. [arXiv](/source/ArXiv_(identifier)):[2502.04913](https://arxiv.org/abs/2502.04913). [Bibcode](/source/Bibcode_(identifier)):[2025A&A...694A.317B](https://ui.adsabs.harvard.edu/abs/2025A&A...694A.317B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202453391](https://doi.org/10.1051%2F0004-6361%2F202453391). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

## External links

- UGC 8669 on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=UGC+8669&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=UGC+8669&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=UGC+8669&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=UGC+8669&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=UGC+8669&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=UGC+8669&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=UGC+8669&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=UGC+8669), [Articles and images](http://www.wikisky.org/starview?object=UGC+8669)

- [UGC 8669 on SIMBAD](http://simbad.u-strasbg.fr/simbad/sim-id?bibyear1=1850&bibyear2=%24currentYear&submit=Display&Ident=%402192475&Name=4C+26.41&bibdisplay=refsum&bibyear1=1850&bibyear2=%24currentYear#lab_bib)

v t e Constellation of Boötes Boötes in Chinese astronomy Boötes Void List of stars in Boötes Stars Bayer α (Arcturus) β (Nekkar) γ (Seginus) δ (Qigong) ε (Izar, Pulcherrima) ζ η (Muphrid) θ ι κ λ (Xuange) μ1 (Alkalurops) μ2 ν1 ν2 ξ ο π ρ (Kalasungsang) σ (Genghe) τ (Tepiamenit) υ φ χ ψ ω Flamsteed 1 2 3 6 (e) 7 9 10 11 12 (d) 13 14 15 18 20 22 (f) 24 (g) 26 31 32 33 34 (Alrumh) 38 (Merga) 39 40 44 (Quadrans) 45 (c) 46 (b) 47 (k) 50 Variable R S T RX ZZ AB BL BP BX BY CE CH CI CN CP CR CX CY (101 Vir) DE EK HN HP HD 118508 118889 122563 125040 125351 (A) 125658 126128 126129 126141 126200 126271 127304 127334 127726 128093 128198 129132 129357 130084 130603 130917 131040 131473 131496 (Arcalís) 132029 132406 132563 134064 134335 135438 135530 135944 141399 Other 2MASS J15031961+2525196 CFBDSIR 1458+10 Gliese 526 HAT-P-4 LHS 2924 PSR J1544+4937 SDSS J1416+1348 SDSS J1433+1011 TVLM 513-46546 WASP-14 WD 1425+540 ZTF J153932.16+502738.8 Exoplanets HAT-P-4b HD 128311 b c HD 132406 b HD 136418 b (Awasis) τ Boötis b TOI-1853 b WASP-14b Star clusters NGC 5466 Galaxies NGC 5008 5248 5251 5416 5490 5500 5504 5508 5514 5523 5529 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5562 5579 5582 5591 5601 5603 5609 5613 5614 5615 5624 5629 5630 5641 5642 5653 5665 5676 5681 5682 5683 5698 5714 5722 5752 5753 5754 5755 5772 5778 5784 5790 5820 5821 5829 5837 5857 5875 5876 5886 5888 5896 5929 5930 5966 Numbered I II III Other 3C 295 3C 299 3C 300 3C 303 3C 315 4C 19.44 4C +26.42 7C 1354+2552 Abell 2009 BCG Arp 302 B2 1420+32 B2 1441+26 CEERS-2112 CEERS-93316 CEERS2-588 CLASS B1359+154 Cloverleaf quasar DDO 190 EGS-zs8-1 EGS-z11-R0 EGSY8p7 H1426+428 IC 4397 IC 4461 IC 4462 IC 4481 IC 4516 IRAS 13349+2438 IRAS 14394+5332 IRAS 15206+3342 LEDA 2108986 MACS 1423-z7p64 MACS J1447.4+0827 BCG Maisie's Galaxy Markarian 463 Markarian 471 Markarian 478 MS 1455.0+2232 BCG MS 1512-cB58 NVSS J141343+433945 OQ 172 OQ 530 PG 1411+442 PG 1543+489 PGC 93125 PGC 1470080 PKS 1345+125 PKS 1413+135 QSO B1422+202 RBS 1467 RGZ J145001.5+144747 RGZ J145039.8+441829 SBS 1415+437 SDSS J135646.10+102609.0 SDSS J1430+2303 Teacup galaxy UGC 8669 UGC 9128 UGC 9425 UGC 9684 UGC 9796 ULAS J1342+0928 VV 191 Galaxy clusters Abell 1795 Abell 1991 BoRG-58 IDCS J1426.5+3508 Astronomical events GRB 990123 GRB 080319B SCP 06F6 SN 2003fg SN 2005bc SN 2020tlf Category

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Adapted from the Wikipedia article [UGC 8669](https://en.wikipedia.org/wiki/UGC_8669) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/UGC_8669?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.