Serendipitous discovery of a dying Giant Radio Galaxy associated with
  NGC 1534, using the Murchison Widefield Array
  Recent observations with the Murchison Widefield Array at 185~MHz have
serendipitously unveiled a heretofore unknown giant and relatively nearby ($z =
0.0178$) radio galaxy associated with NGC\,1534. The diffuse emission presented
here is the first indication that NGC\,1534 is one of a rare class of objects
(along with NGC\,5128 and NGC\,612) in which a galaxy with a prominent dust
lane hosts radio emission on scales of $\sim$700\,kpc. We present details of
the radio emission along with a detailed comparison with other radio galaxies
with disks. NGC1534 is the lowest surface brightness radio galaxy known with an
estimated scaled 1.4-GHz surface brightness of just 0.2\,mJy\,arcmin$^{-2}$.
The radio lobes have one of the steepest spectral indices yet observed:
$\alpha=-2.1\pm0.1$, and the core to lobe luminosity ratio is $<0.1$\%. We
estimate the space density of this low brightness (dying) phase of radio galaxy
evolution as $7\times10^{-7}$\,Mpc$^{-3}$ and argue that normal AGN cannot
spend more than 6\% of their lifetime in this phase if they all go through the
same cycle.
