Abstract:
We report the discovery of a very unusual, highly asymmetric radio galaxy whose radio jet, the largest yet
detected, emits strongly polarized synchrotron radiation and can be traced all the way from the galactic nucleus
to the hot spot located ∼440 kpc away. This jet emanates from an extremely massive black hole (>10⁹ M☉,) and
forms a strikingly compact radio lobe. No radio lobe is detected on the side of the counterjet, even though it is
similar to the main jet in brightness up to a scale of tens of kiloparsecs. Thus, contrary to the nearly universal
trend, the brightness asymmetry in this radio galaxy increases with distance from the nucleus. With several
unusual properties, including a predominantly toroidal magnetic field, this Fanaroff-Riley type II megajet is an
exceptionally useful laboratory for testing the role of magnetic field in jet stabilization and radio lobe formation.
