B3 0309+411B

B3 0309+411B is classified as a giant radio galaxy with angular size of 1.8 megaparsecs.^[4][3] When imaged, it is dominated by a central radio core, straddled by two radio lobes which are extended by 9.5 arcseconds.^[3] Very Large Array (VLA) and Very Long Baseline Interferometry (VLBI) also found there is a weak jet-like extension.^[5][6] Imaging by Giant Metrewave Radio Telescope revealed the galaxy has a radio jet which curves and extends by 250 kiloparsecs before bending in an abrupt way, reaching a northern hotspot region.^[7] New imaging at 43 GHz by Very Long Baseline Array (VLBA) revealed a straight jet instead, aligning with a brighter kiloparsec-jet.^[8]

The core of B3 0309+411B is found strongly variable at wavelengths and has an inverted radio spectrum.^[3][9] The asymmetry of the core is likely influenced through relativistic motion.^[9] It has an extension towards northwest direction of a blob feature 25 located arcseconds away according to VLA and MERLIN observations.^[10] Evidence also confirmed the core component might be variable in polarization given the polarization percentage recorded at 1600 MHz is 0.655 ± 0.6 at the position angle of 13 ± 2°.^[11]

Observations with Westerbork Synthesis Radio Telescope in 1979, located an additional component in B3 0309+411B. This component appears resolved and is located 87 arcseconds away from the compact component. Further evidence also showed it is extended and has a flat spectral index between 178 MHz and 1.4 GHz. It is suggested the source might belong to a D2 classification; sources that are depicted with a flat spectrum component and coincident with an optical object.^[12]

• B3 0303+411B on SIMBAD