SIP: Not Long Ago, The Center of the Milky Way Exploded

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SIP: Not Long Ago, The Center of the Milky Way Exploded

Post by bystander » Tue Oct 08, 2019 3:56 am

Not Long Ago, The Center of the Milky Way Exploded
Astro 3D | Via Science in Public | 2019 Oct 06

Researchers find evidence of a cataclysmic flare that punched so far out of the Galaxy its impact was felt 200,000 light years away.

A titanic, expanding beam of energy sprang from close to the supermassive black hole in the centre of the Milky Way just 3.5 million years ago, sending a cone-shaped burst of radiation through both poles of the galaxy and out into deep space.

That’s the finding arising from research conducted by a team of scientists led by Professor Joss Bland-Hawthorn from Australia’s ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) and soon to be published in The Astrophysical Journal.

The phenomenon, known as a Seyfert flare, created two enormous ‘ionisation cones’ that sliced through the Milky Way -- beginning with a relatively small diameter close to the black hole, and expanding vastly as they exited the galaxy.

So powerful was the flare that it impacted on the Magellanic Stream -- a long trail of gas extending from nearby dwarf galaxies called the Large and Small Magellanic Clouds. The Magellanic Stream lies at an average 200,000 light-years from the Milky Way. ...

The Large-Scale Ionization Cones in the Galaxy ~ Joss Bland-Hawthorn et al Fossil Imprint of a Powerful Flare at the Galactic Centre Along the Magellanic Stream ~ Joss Bland-Hawthorn et al
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