Radio Emission Bridge

10 Jun 2019

Interesting one at https://phys.org/news/2019-06-ridge-radio-emissions-galaxy-clusters.html ... an article in the journal Science by an international team describe how they found a ridge of radion emissions joining two galaxy clusters - a sort of bridge between the pair. Prior studies had shown that some galaxy clusters have magnetic fields - and the research was intent on seeing how this works. A low frequency radio telescope was used to peer at the two galaxies (made up of 25,000 antennae spread across 51 locations) where they found evidence of filaments of gases (plasma) - a band of radiation known as a synchrotron emission. It is created by electrons moving through a magnetic field. They also found the magentic field stretched from one galaxy to the other - via a filament flow.

The findings raise several questions. Is it a common occurrence, for example, and where did the electrons come from. We are going to have to wait for LoFor to become active (the Square Kilimetre Array). It is designed to take a more intense look at the filaments and other magnetic fields in space. Further, there is a video at the link above, illustrating what has been discovered and how it gels into mainstream cosmology. Science (2019) DOI:10.1126/science.aat7500

At https://phys.org/news/2019-06-most-detailed-ever-simulations-black-hole-... ... the key word here is simulation - the most detailed simulation in fact (of a black hole). It claims to solve a mystery - accretion and how it happens. The simulation is said to prove (?) the theoretical prediction about the nature of accretion discs (the matter that orbits and falls into the hole) - that have never been seen (their words). The team of computerised astrophysicists ... and so on.