Date of the discovery: 01 October 2011

Short Description: Spiral Galaxies are not supposed to host large radio jets. Speca (Spiral-host Episodic radio galaxy tracing Cluster Accretion) is one of the few that does not abide by this rule. Not only it is the second Spiral DRAGN (Double Radio-source Associated with Galactic Nucleus) discovered it is also the first Spiral DRAGN and the second DRAGN showing three episodes of activity. It was discovered by the first Indian Citizen-Science Research project. See also J1649+2635. (Note: Sadly the paper and the press-release does not mention the volunteer involvement, but they state they made the discovery and an additional source that I thrust mentions the paper).

Volunteer(s): RAD @ home volunteers

Researchers in the discovery paper: Ananda Hota S. K. Sirothia Youichi Ohyama C. Konar Suk Kim Soo-Chang Rey D. J. Saikia J. H. Croston Satoki Matsushita

Link to paper in ADS: https://ui.adsabs.harvard.edu/abs/2011MNRAS.417L..36H/abstract

SIMBAD page: http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Speca&submit=SIMBAD+search

Telescopes involved: Lulin One-meter telescope, Giant Metrewave Radio Telescope

Figure 2 of the paper, showing the GMRT contours, the middle lobe and the outer relic lobe are clearly visible. The outer lobe is a relic of past activity.


Other pages:

wikipedia: https://en.wikipedia.org/wiki/List_of_spiral_DRAGNs

Press Release: https://public.nrao.edu/news/exotic-galaxy-reveals-tantalizing-tale/

Project websites: RAD @ home

Credit for the header image: Hota et al., SDSS, NCRA-TIFR, NRAO/AUI/NSF

Go back to the timeline↵


One thought on “Speca

Comments are closed.