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'Ageless' silicon throughout Milky Way may indicate a well-m

 
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PostPosted: 27.04.2017 10:35    Post subject: 'Ageless' silicon throughout Milky Way may indicate a well-m Reply with quote

'Ageless' silicon throughout Milky Way may indicate a well-mixed galaxy

https://m.phys.org/news/2017-04-ageless-silicon-milky-well-mixed-galaxy.html

"Counter to their expectations, the researchers found none of the expected gradient in the isotope ratios.

"There was no evidence of a gradient," said Nathaniel Monson, a member of the research team and a graduate student at UCLA. "That was a bit surprising. We may have to reassess what we think we know about our galaxy."

These data may mean that the Milky Way is remarkably efficient at mixing its material, circulating molecules and atoms from the galactic center out into the galaxy's spiral arms and back. It is also possible that type 1a supernovas—which are formed in binary systems when a white dwarf star steals too much material from its companion and detonates—produce an overabundance of Si 28 later in the lifespan of a galaxy.

If subsequent surveys of carbon and oxygen are better able to account for past uncertainties and show the same lack of gradient, it would point to mixing as being the most likely scenario.

"There's a lot about the galaxy we don't understand yet," concluded Young. "It's possible that further studies with the GBT will teach us a bit more about the Milky Way.""

Sisältä ulos päin syntyvät laajenevat galaksit.

Laajenevat tähdet työntyvät aikansa pois päin galaksin keskustasta nopeammin kuin laajenevat, mutta vauhdin hidastuminen saa ne lähestymään laajenevan galaksin keskustaa suhteellisesti ottaen eli havaittavasti, vaikka ne edelleen työntyvät sieltä pois päin.

Nuoremmat laajenevat tähdet työntyvät niiden ohi, kaikkien työntyessä pois päin laajenevan galaksin keskustan laajenevasta supermassiivisesta kohteesta.

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