The evolving radio jet from the neutron star X-ray binary 4U 1820-30

The persistently bright ultra-compact neutron star low-mass X-ray binary 4U 1820-30 displays a \sim170 d accretion cycle, evolving between phases of high and low X-ray modes, where the 3 -- 10 keV X-ray flux changes by a factor of up to \approx 8. The source is generally in a soft... Show more