| In the local Universe, large-scale
double-lobed radio sources are almost always hosted by elliptical galaxies.
This is consistent with leading galaxy formation models that suggest both
elliptical galaxies and extended radio sources are the result of mergers.
These models do not allow for spiral galaxies to host large-scale double-lobed
radio sources. However, to-date, four such sources have been observed to exist
in the local Universe, including the recently discovered double-lobed radio source J1649+2635 (Mao
et al. 2015). We call these sources "spiral DRAGNs". - The image above
shows an SDSS optical image of J1649+2635 (in red) overlaid with FIRST radio
emission (in blue).
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