Spectroscopic and radio imaging reveals 100 kpc curved twin jets in giant radio galaxy J0644+1043, indicating effective jet precession shapes its morphology.
We report the discovery of an S-shaped morphology of the radio galaxy J0644$+$1043 imaged with a 30 μJy sensitive 525 MHz broadband (band 3 $+$ 4) uGMRT map. Dedicated spectroscopic observations of the host galaxy carried out with the 2-meter Rozhen telescope yielded a redshift of 0.0488, giving a projected linear size of the peculiar radio structure of over 0.7 Mpc. This giant radio galaxy is powered by a black hole of mass 4.1+9.39-2.87× 10⁸ , from which vicinity emanate well-collimated and knotty jets, each ~100 kpc long. The entire radio structure, presumably due to the effective jet precession, is less than 50 Myr old, has a power of ~6 × 10²⁴ W Hz⁻¹ at 1.4 GHz and the observed morphological characteristics do not strictly conform to the traditional FR I or FR II categories.
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