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Centre of the Galaxy

2 June 2021

At  https://phys.org/news/2021-05-astronomer-reveals-never-before-seen-cente… … Using NASAs Chandra X-ray Observatory telescope Daniel Wang has obtains an amazing view of the centre of the galaxy – peering through the fog of gas and dust. A pair of X-ray emitting plumes can be seen emerging from where the black hole at the heart of the Milky Way is thought to exist. Even more intriguing is what they are calling an ongoing magnetic reconnection event. These are, we are told, two opposing magnetic fields forced together to combine with each other and in the process release enormous amounts of energy. This is the same process that is thought to create solar flares on the Sun. Here we have, at orders of magnitude much greater, in the centre of our galaxy [and in the centre of all the other galaxies]. These are huge flares – but designated for the time being as plumes of energy.

At https://phys.org/news/2021-05-magnetized-threads-spectacular-galactic-ta… … there are spectacular images at the link from NASA, a panorama of the centre of the galaxy. On page 2 is a reference to Wang's plumes of hot gas [plasma] that extend for 700 light years above and below the plane of our galaxy. They are much smaller than Fermi Bubbles which extend 2500 light years above and below, but the plume, it is said, may represent galactic flares analogous to the particles driven away by the Sun during flaring. It adds – the gas is likely heated by supernova explosions and magnetic reconnection events. Lots of guesswork being bandied about for the moment it would seem. Todays guess may be discarded tomorrow. It's a learning curve – where theory may hit the buffers of reality. It seems that where the Sun produces solar flares which are akin to cosmic rays but limited to the confines of the solar system, the galaxy emits cosmic rays at a much greater rate of production, and these can also penetrate into our solar system [from our galaxy and from other galaxies]. What does this say about black holes? Are they imaginary – a theory that may have to be abandoned.

Finally, at https://phys.org/news/2021-05-black-hole-simulations-blueprint-future.html … we are now delving back into simulation of black holes as they remain tediously elusive.


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