The Discovery of a Low-Luminosity SPIRAL DRAGN
  Standard galaxy formation models predict that large-scale double-lobed radio
sources, known as DRAGNs, will always be hosted by elliptical galaxies. In
spite of this, in recent years a small number of spiral galaxies have also been
found to host such sources. These so-called spiral DRAGNs are still extremely
rare, with only $\sim 5$ cases being widely accepted. Here we report on the
serendipitous discovery of a new spiral DRAGN in data from the Giant Metrewave
Radio Telescope (GMRT) at 322 MHz. The host galaxy, MCG+07-47-10, is a face-on
late-type Sbc galaxy with distinctive spiral arms and prominent bulge
suggesting a high black hole mass. Using WISE infra-red and GALEX UV data we
show that this galaxy has a star formation rate of 0.16-0.75
M$_{\odot}$yr$^{-1}$, and that the radio luminosity is dominated by
star-formation. We demonstrate that this spiral DRAGN has similar environmental
properties to others of this class, but has a comparatively low radio
luminosity of $L_{\rm 1.4GHz}$ = 1.12$\times$10$^{22}$ W Hz$^{-1}$, two orders
of magnitude smaller than other known spiral DRAGNs. We suggest that this may
indicate the existence of a previously unknown low-luminosity population of
spiral DRAGNS.
