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We identify a source (J1507+3013) with an extended diffuse radio emissionaround an elliptical galaxy from the Very Large Array (VLA) Faint Images ofRadio Sky at Twenty-cm (FIRST) survey. J1507+3013 possesses a morphologysimilar to the recently identified circular, low-surface-brightness,edge-brightened radio sources commonly known as odd radio circles (ORCs). Suchdiffuse emissions, as reported in this paper, are also found in mini-haloes andfossil radio galaxies, but the results presented here do not match theproperties of mini-haloes or of fossil radio galaxies. The extended emissionobserved in J1507+3013 around an elliptical galaxy is a very rare class ofdiffuse emission that is unlike any previously known class of diffuse emission.The extended diffuse emission of J1507+3013 is also detected in the LowFrequency Array (LOFAR) at 144 MHz. J1507+3013 is hosted by an optical galaxynear the geometrical centre of the structure with a photometric redshift of$z=0.079$. The physical extent of J1507+3013 is approximately 68 kpc, with apeak-to-peak angular size of 44 arcsec. It shows a significantly higher fluxdensity compared with previously discovered ORCs. The spectral index ofJ1507+3013 varies between -0.90 and -1.4 in different regions of the diffusestructure, which is comparable to the case for previously discovered ORCs butless steep than for mini-haloes and fossil radio galaxies. If we considerJ1507+3013 as a candidate ORC, then this would be the closest and most luminousORC discovered so far. This paper describes the radio, spectral, and optical/IRproperties of J1507+3013 in order to study the nature of this source.

Discovery of a circularly symmetric extended diffuse radio emission around an elliptical galaxy with the VLA FIRST survey