GM074
Sco X-1 is the brightest X-ray source in the sky. Located 2.8 kpc away, Sco X-1 is one of the few neutron star binaries where extended radio jets have been resolved at mas scales, and the first accreting neutron star system that showed ultrarelativistic outflows with Lorentz factors > 3, thus breaking the 'jet speed ~ escape velocity' paradigm. we propose to observe Sco X-1 continuously for 72 hr using the EVN, the VLBA and the LBA combined in Global VLBI at 8.4 GHz. We will simultaneously observe the target in the X-rays with the Chandra satellite and the NICER mission, thus providing the best simultaneous radio/X-ray coverage of a galactic X-ray binary to date. With the requested data, we aim to unveil the link between specific accretion events (X-ray state transitions and/or quasi periodic oscillations) and the ejection of different types of transient outflows: the discrete ballistic ejection at the origin of the radio lobes in Sco X-1, and the ultrarelativistic outflows). We further aim at improving our understanding of the ultra-relativistic outflows and of the conditions at the base of their production.
Observation pages at the EVN archive:
Context for this dataThis data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197