Hubble Examines the Wreckage From the 2017 Kilonova universetoday storybywill
This allowed them to combine radio measurements with the afterglow’s light curve and measurements of its relative motion since it was first detected. The combined data allowed them to pinpoint the explosion site, and debris created from the explosion was drawn in by the black hole. This material was pulled into a rapidly-spinning disk that caused superluminous jets to emanate from its poles that crashed through and swept up material from the expanding debris cloud.
In brief, a relativistic jet chases its own light, and more time has passed between the jet’s emission of light than the observer perceives. This causes the object’s velocity to appear to be moving faster than the speed of light, which is physically impossible. Correcting for this, Mooley and his colleagues obtained accurate estimates of the jet’s velocity that showed it traveling at close to the speed of light. “Our result indicates that the jet was moving at least at 99.
Artist’s impression of a black hole surrounded by superheated material and a relativistic jet. Credit: ESO/M. Kornmesser These findings greatly strengthen the long-presumed connection between neutron star mergers and short-duration GRBs, which require that a fast-moving jet emerge. They also pave the way for future precision studies of neutron star mergers and the superluminous jets that result. These studies could help resolve one of the biggest mysteries in astrophysics today: the rate at which the Universe is expanding .
Basically, there is a discrepancy between the estimated values obtained from measurements of the local Universe and those obtained from the early Universe. The former value is based on extremely precise observations by Hubble and other observatories of Type Ia supernovae, which are a highly-accurate method for distance-keeping. The latter value is based on the
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