# Beaver galaxy

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Radio galaxy in the constellation Draco

Beaver galaxy SDSS image of the Beaver galaxy Observation data (J2000.0 epoch) Constellation Draco Right ascension 17h 13m 16.00s[1] Declination +63° 47′ 37.56″[1] Redshift 0.082955 Heliocentric radial velocity 24,869 km/s ± 4[1] Distance 1,205.6 ± 84.4 Mly (369.65 ± 25.88 Mpc)[1] Group or cluster Abell 2255 magnitude (J) 12.97[1] Characteristics Type Radio galaxy[1] Size ~362,000 ly (110.9 kpc) (estimated)[1] Other designations 14W 119, PGC 59867, 2MASX J17131603+6347378, 7C 1712+6352, 1712+638, ABELL 2255:[ZBO89] O4, [GMF2006] J1713.3+6347[1]

The **Beaver galaxy** known as **7C 1712+6352** or **1712+638**, is a [radio galaxy](/source/Radio_galaxy) located in the constellation of [Draco](/source/Draco_(constellation)). The [redshift](/source/Redshift) of the galaxy is (z) 0.082[1] and it was first discovered by [astronomers](/source/Astronomer) in 1980. It is also considered to be a member of [Abell 2255](/source/Abell_2255) alongside the [Goldfish galaxy](/source/Goldfish_galaxy), [Original TRG](/source/Original_TRG) and the [Embryo galaxy](https://en.wikipedia.org/w/index.php?title=Embryo_galaxy&action=edit&redlink=1).[2][3]

## Description

The Beaver galaxy is classified to be head-tail [radio galaxy](/source/Radio_galaxy) or alternatively, a narrow angle tail radio galaxy, positioned in the southern region away from the center of Abell 2255.[2][4][5] When observed, the source is found to be extended over an area of 400 [kiloparsecs](/source/Parsec) with two regions of [polarized](/source/Polarization_(cosmology)) emission located by 10 [arcseconds](/source/Minute_and_second_of_arc) west and northwest from the peak of the northern radio region, in the [position angle](/source/Position_angle) of 90°.[2] The tail feature of the Beaver galaxy has been described to have a long appearance and shown to drastically increase its length to around 1 megaparsec. It also exhibits signs of steepening of the [spectral index](/source/Spectral_index) indicating the [electrons](/source/Electron) lost energy after being ejected from the host. The ages of the [plasma](/source/Plasma_(physics)) of the tail end is estimated to be 2.2 × 108 years.[6][7]

Radio imaging made by [Very Large Array](/source/Very_Large_Array) (VLA), showed the presence of two [radio jets](/source/Astrophysical_jet) bending backwards from the radio core of the Beaver galaxy.[8] Evidence also found the inner regions of the jets displaying significant signs of polarization at 20 kiloparsecs from the core. However the eastern jet seems less polarized when imaged at 3.6 [centimeters](/source/Centimetre) while the western jet is more polarized. The estimated [fractional](/source/Fractional) polarization of the eastern jet is 12% while the western jet has fractional polarization of 23%.[9] Further radio observations also found both of the jets are shown closer to each other along the tail position, before subsequently forming a [corkscrew](/source/Corkscrew) feature. Observations at low frequencies, found the tail feature as twisted and fading away upon reaching the cluster [radio emission](/source/Radio_wave) halo.[4]

## 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) [***h***](#cite_ref-ned_1-7) [***i***](#cite_ref-ned_1-8) ["NED Search results for Beaver galaxy"](https://ned.ipac.caltech.edu/byname?objname=LEDA+59867&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2026-02-15.

1. ^ [***a***](#cite_ref-:0_2-0) [***b***](#cite_ref-:0_2-1) [***c***](#cite_ref-:0_2-2) Harris, D. E.; Kapahi, V. K.; Ekers, R. D. (February 1980). ["Westerbork synthesis observations of 8 clusters of galaxies which contain tailed radio galaxies"](https://articles.adsabs.harvard.edu//full/1980A%26AS...39..215H/0000219.000.html). *Astronomy and Astrophysics Supplement Series*. **39**: 215–233. [Bibcode](/source/Bibcode_(identifier)):[1980A&AS...39..215H](https://ui.adsabs.harvard.edu/abs/1980A&AS...39..215H). [ISSN](/source/ISSN_(identifier)) [0365-0138](https://search.worldcat.org/issn/0365-0138).

1. **[^](#cite_ref-3)** Burns, Jack O.; Roettiger, Kurt; Pinkney, Jason; Perley, Rick A.; Owen, Frazer N.; Voges, Wolfgang (June 1995). ["Evidence for an On-going Cluster/Group Merger in Abell 2255"](https://articles.adsabs.harvard.edu/pdf/1995ApJ...446..583B). *The Astrophysical Journal*. **446**: 583. [doi](/source/Doi_(identifier)):[10.1086/175817](https://doi.org/10.1086%2F175817). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. ^ [***a***](#cite_ref-:1_4-0) [***b***](#cite_ref-:1_4-1) Rubeis, E. De; Bondi, M.; Botteon, A.; Weeren, R. J. van; Jong, J. M. G. H. J. de; Rudnick, L.; Brunetti, G.; Rajpurohit, K.; Gheller, C.; Röttgering, H. J. A. (2025-07-01). ["Revealing the intricacies of radio galaxies and filaments in the merging galaxy cluster Abell 2255 - I. Insights from deep LOFAR-VLBI sub-arcsecond resolution images"](https://www.aanda.org/articles/aa/abs/2025/07/aa55268-25/aa55268-25.html). *Astronomy & Astrophysics*. **699**: A229. [arXiv](/source/ArXiv_(identifier)):[2505.13595](https://arxiv.org/abs/2505.13595). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202555268](https://doi.org/10.1051%2F0004-6361%2F202555268). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-5)** Govoni, F.; Murgia, M.; Feretti, L.; Giovannini, G.; Dolag, K.; Taylor, G. B. (2006-12-01). ["The intracluster magnetic field power spectrum in Abell 2255"](https://www.aanda.org/articles/aa/pdf/2006/47/aa5964-06.pdf) (PDF). *Astronomy & Astrophysics*. **460** (2): 425–438. [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20065964](https://doi.org/10.1051%2F0004-6361%3A20065964). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-6)** Pizzo, R. F.; Bruyn, A. G. de; Bernardi, G.; Brentjens, M. A. (2011-01-01). ["Deep multi-frequency rotation measure tomography of the galaxy cluster A2255"](https://www.aanda.org/articles/aa/pdf/2011/01/aa14158-10.pdf) (PDF). *Astronomy & Astrophysics*. **525**: A104. [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201014158](https://doi.org/10.1051%2F0004-6361%2F201014158). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-7)** Pizzo, R. F.; Bruyn, A. G. de (2009-11-01). ["Radio spectral study of the cluster of galaxies Abell 2255"](https://www.aanda.org/articles/aa/abs/2009/44/aa12465-09/aa12465-09.html). *Astronomy & Astrophysics*. **507** (2): 639–659. [arXiv](/source/ArXiv_(identifier)):[0909.5198](https://arxiv.org/abs/0909.5198). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/200912465](https://doi.org/10.1051%2F0004-6361%2F200912465). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-8)** O'Dea, C. P.; Owen, F. N. (June 1985). ["VLA observations of 57 sources in clusters of galaxies"](https://articles.adsabs.harvard.edu/pdf/1985AJ.....90..927O). *The Astronomical Journal*. **90**: 927–953. [doi](/source/Doi_(identifier)):[10.1086/113801](https://doi.org/10.1086%2F113801). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-9)** Govoni, F.; Murgia, M.; Feretti, L.; Giovannini, G.; Dolag, K.; Taylor, G. B. (2006-12-01). ["The intracluster magnetic field power spectrum in Abell 2255"](https://www.aanda.org/articles/aa/pdf/2006/47/aa5964-06.pdf) (PDF). *Astronomy & Astrophysics*. **460** (2): 425–438. [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20065964](https://doi.org/10.1051%2F0004-6361%3A20065964). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

## External links

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

- [Beaver galaxy on SIMBAD](https://simbad.cds.unistra.fr/simbad/sim-id?Ident=NAME%20Beaver%20Galaxy)

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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