List of spiral DRAGNs

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Spiral DRAGNs are a type of galaxy; spiral galaxies which contain DRAGNs (Double Radio-source Associated with Galactic Nucleus), and are therefore also radio galaxies.

Most DRAGNs are associated with elliptical galaxies, as are most double-lobed radio-galaxies.[1] Spiral DRAGNs are inconsistent with currently known galaxy formation processes.[2] As of 2015, there are 4 known spiral DRAGNs.[3]


Galaxy Identified Date Notes
galaxy 0313-192 2003 First known spiral DRAGN, located in Abell 428 [4][5]
Speca 2011 Second known spiral DRAGN. It was the second galaxy shown to have three episodes of periodic activity, the first was an elliptical. [NB 1][6][5]
J2345-0449 2014 Third known spiral DRAGN (found and studied first by Bagchi et al. 2014) with two episodic activities, observed at radio wavelengths and measuring about 1.6 Megaparsecs in total size.
SDSS J164924.01+263502.5
(SDSS J1649+2635, FIRST J1649+2635)
2014 Fourth known spiral DRAGN; first located in a grand design spiral galaxy. [1][7][5][8]


  1. ^ SPECA = Spiral-host Episodic radio galaxy tracing Cluster Accretion


  1. ^ a b Minnie Mao; Ryan Duffin; Frazer Owen; William Keel; Jay Blanchard (2013-08-02). "A low-band study of the spiral DRAGN 1649+26". NRAO. VLA/14A-406. Cite journal requires |journal= (help)
  2. ^ University of Manchester, "Here be Spiral DRAGNs", H2020-EU.1.3.2., CORDIS, 660432
  3. ^ Minnie Mao (2015). "Spiral DRAGNs in the local Universe". NRAO Postdoctoral Symposium (Socorro NM). NRAO. 11.
  4. ^ "Giant Radio Jet Coming From Wrong Kind of Galaxy". NRAO. 8 January 2003.
  5. ^ a b c Jaime Trosper (6 December 2014). "Astronomers Find a Strange, Perplexing Spiral Galaxy". From Quarks to Quasars.
  6. ^ "Exotic Galaxy Reveals Tantalizing Tale". 25 August 2011.
  7. ^ "Strange galaxy perplexes astronomers: Prominent 'jets' of subatomic particles". ScienceDaily. 2 December 2014.
  8. ^ Minnie Y. Mao; Frazer Owen; Ryan Duffin; Bill Keel; Mark Lacy; Emmanuel Momjian; Glenn Morrison; Tony Mroczkowski; Susan Neff; Ray P. Norris; Henrique Schmitt; Vicki Toy; Sylvain Veilleux (2015). "J1649+26: A Grand-Design Spiral with a Large Double-Lobed Radio Source". Monthly Notices of the Royal Astronomical Society. 446 (4): 4176–4185. arXiv:1410.8520. Bibcode:2015MNRAS.446.4176M. doi:10.1093/mnras/stu2302. S2CID 119234804.