We report the discovery of a grand-design spiral galaxy associated with a double-lobed radio source. J1649+2635 (z = 0.0545) is a red spiral galaxy with a prominent bulge that it is associated with a L1.4 GHz ∼1024 W Hz−1 double-lobed radio source that spans almost 100 kpc. J1649+2635 has a black hole mass of MBH ∼ 3–7 × 108 M⊙ and SFR ∼ 0.26 – 2.6 M⊙ year−1. The galaxy hosts a ∼96 kpc diffuse optical halo, which is unprecedented for spiral galaxies. We find that J1649+2635 resides in an overdense environment with a mass of Mdyn = 7.7 +7.9 −4.3 × 1013 M⊙, likely a galaxy group below the detection threshold of the ROSAT All-Sky Survey. We suggest one possible scenario for the association of double-lobed radio emission from J1649+2635 is that the source may be similar to a Seyfert galaxy, located in a denser-than-normal environment. The study of spiral galaxies that host large-scale radio emission is important because although rare in the local Universe, these sources may be more common at high-redshifts.
Mao, Minnie Y. et al.