# WN B1851+5707

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Radio galaxy in the constellation Draco

WN B1851+5707 Pan-STARRS image of WN B1851+5707 Observation data (J2000.0 epoch) Constellation Draco Right ascension 18h 52m 08.56s[1] Declination +57° 11′ 42.50″[1] Redshift 0.107035[1] Heliocentric radial velocity 32,088 ± 0 km/s[1] Distance 1,554.1 ± 108.8 Mly (476.48 ± 33.35 Mpc)[1] magnitude (J) 13.76[1] Characteristics Type USS[1] Size ~239,000 ly (73.3 kpc) (estimated)[1] Other designations 2MASX J18520859+5711430, 6C B185115.2+570808, LEDA 2559680, 8C 1851+571, NVSS J185208+571142, RX J1852.1+5711:[HDH2012] BCG, WN B1851+5707:[MPM2011] a[1]

**WN B1851+5707** also known as **WN B1851+5707a**, is a [radio galaxy](/source/Radio_galaxy) located in the constellation of [Draco](/source/Draco_(constellation)). The [redshift](/source/Redshift) of the object is (z) 0.107[1] and it was first discovered by [astronomers](/source/Astronomer) in November 1998 from the WENSS survey where they classified it as an [elliptical galaxy](/source/Elliptical_galaxy) without the presence of any [emission lines](/source/Spectral_line) in its [optical spectrum](/source/Visible_spectrum).[2]

## Description

WN B1851+5707 is categorized as a dying radio galaxy located at the center of a cool core [galaxy cluster](/source/Galaxy_cluster), RX J1852.1+5711.[3] Radio imaging made with the [Very Large Array](/source/Very_Large_Array) (VLA) found it is actually made up of two separate [radio sources](/source/Astronomical_radio_source) called WN B1851+5707a and WN B1851+5707b, associated with this object and another dying radio galaxy.[3][4] The main source (WN B1851+5707a) has an ultra steep [radio spectrum](/source/Radio_spectrum) with a compact and luminous appearance.[4][5] The [spectral index](/source/Spectral_index) of the source is found to be 1.7α and the total flux [density](/source/Density) is 53.3 mJy at 1.4 [GHz](/source/Hertz) [frequencies](/source/Frequency). A total radio power at 151 [MHz](/source/Hertz) is calculated as 1025.3 W Hz-1.[6]

There is a point-like source positioned in the center of the galaxy with radio [flux](/source/Flux) originating from within an extended structure, making it a de-energized source. It has a shapeless appearance and is asymmetric. The total linear [size](/source/Size) is estimated to be 30 × 15 [kiloparsecs](/source/Parsec). There are no signs of any [radio jets](/source/Astrophysical_jet) categorized as active.[4] A study published in 2011, has found the [radio lobes](/source/Radio_galaxy) ejected from the galaxy have a total radio [luminosity](/source/Luminosity) of 1.8 × 1025 W/Hz and a spectra index of 0.7α. No evidence of [X-ray](/source/X-ray_astronomy) cavities were associated with the lobes.[3]

## 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) [***j***](#cite_ref-ned_1-9) ["NED Search results for WN B1851+5707"](https://ned.ipac.caltech.edu/byname?objname=LEDA+2559680&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2026-05-19.

1. **[^](#cite_ref-2)** de Ruiter, H. R.; Parma, P.; Stirpe, G. M.; Perez-Fournon, I. (November 1998). ["Bright galaxies from WENSS. I. The minisurvey"](https://ui.adsabs.harvard.edu/scan/manifest/1998A%26A...339...34D?art=true). *Astronomy and Astrophysics*. **339**: 34–40.

1. ^ [***a***](#cite_ref-:0_3-0) [***b***](#cite_ref-:0_3-1) [***c***](#cite_ref-:0_3-2) Murgia, M.; Markevitch, M.; Govoni, F.; Parma, P.; Fanti, R.; Ruiter, H. R. de; Mack, K.-H. (2012-12-01). ["Chandra observations of dying radio sources in galaxy clusters"](https://www.aanda.org/articles/aa/abs/2012/12/aa19702-12/aa19702-12.html). *Astronomy & Astrophysics*. **548**: A75. [arXiv](/source/ArXiv_(identifier)):[1210.6864](https://arxiv.org/abs/1210.6864). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219702](https://doi.org/10.1051%2F0004-6361%2F201219702). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. ^ [***a***](#cite_ref-:1_4-0) [***b***](#cite_ref-:1_4-1) [***c***](#cite_ref-:1_4-2) Murgia, M.; Parma, P.; Mack, K.-H.; Ruiter, H. R. de; Fanti, R.; Govoni, F.; Tarchi, A.; Giacintucci, S.; Markevitch, M. (2011-02-01). ["Dying radio galaxies in clusters"](https://www.aanda.org/articles/aa/pdf/2011/02/aa15302-10.pdf) (PDF). *Astronomy & Astrophysics*. **526**: A148. [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201015302](https://doi.org/10.1051%2F0004-6361%2F201015302). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-5)** De Breuck, C.; van Breugel, W.; Röttgering, H. J.A.; Miley, G. (April 2000). "A sample of 669 ultra steep spectrum radio sources to find high redshift radio galaxies". *Astronomy and Astrophysics Supplement Series*. **143** (2): 303–333. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0002297](https://arxiv.org/abs/astro-ph/0002297). [doi](/source/Doi_(identifier)):[10.1051/aas:2000181](https://doi.org/10.1051%2Faas%3A2000181). [ISSN](/source/ISSN_(identifier)) [0365-0138](https://search.worldcat.org/issn/0365-0138).

1. **[^](#cite_ref-6)** Murgia, M.; Parma, P.; Ruiter, H. R. de; Mack, K.-H.; Fanti, R. (2004-05-26), "Dying Radio Galaxies In Clusters", *Conference proceeding: X-Ray and Radio Connections Santa Fe, New Mexico*, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0405091](https://arxiv.org/abs/astro-ph/0405091), arXiv:astro-ph/0405091

## External links

- WN B1851+5707 on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=WN+B1851%2B5707&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=WN+B1851%2B5707), [Articles and images](http://www.wikisky.org/starview?object=WN+B1851%2B5707)

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 [WN B1851+5707](https://en.wikipedia.org/wiki/WN_B1851%2B5707) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/WN_B1851%2B5707?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.