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Stars memorize rebirth of our home galaxy

Dragon
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Post by Dragon Fri Aug 24, 2018 3:33 am

The Milky Way galaxy has died once before, and we are now in what is considered its second life. Calculations by Masafumi Noguchi (Tohoku University) have revealed previously unknown details about the Milky Way. These were published in the July 26 edition of Nature.

Stars in the Milky Way formed in two different epochs through different mechanisms. There was a long dormant period in between, when star formation ceased. Our home galaxy has turned out to have a more dramatic history than was originally thought.

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Dragon
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Post by Dragon Fri Aug 24, 2018 3:35 am

Stars memorize rebirth of our home galaxy Starsmemoriz
(Credit: M. Haywood et al. A&A, 589, 66 (2016), reproduced with permission ©️ ESO).

Schematic diagram showing two stages of star formation in the Milky Way galaxy according to Noguchi.

In upper illustration, blue (cold) and red (hot) indicate gas. The color map in bottom panel shows distribution of the elemental composition of stars calculated by Noguchi's model with the purple line indicating how the elemental composition of the gas changes over time (Credit: M. Noguchi, courtesy of Nature).

Overlaid contours show the distribution of solar neighborhood stars observed by APOGEE, a spectroscopic device attached to the 2.5 m telescope of the Alfred P. Sloan Foundation at Apache Point Observatory in New Mexico.

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Stars memorize rebirth of our home galaxy 334pu7m
Dragon
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Post by Dragon Fri Aug 24, 2018 3:41 am

Stars memorize rebirth of our home galaxy 1-starsmemoriz
(Credit: M. Haywood et al. A&A, 589, 66 (2016), reproduced with permission ©️ ESO).

Model prediction for three different regions of the Milky Way (Credit: M. Noguchi, courtesy of Nature). Contours are from observations by APOGEE

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Stars memorize rebirth of our home galaxy 334pu7m
Dragon
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Post by Dragon Fri Aug 24, 2018 3:48 am



Stars in the Milky Way formed in two different epochs through different mechanisms. There was a long dormant period in between, when star formation ceased. Our home galaxy has turned out to have a more dramatic history than was originally thought.

The history of the Milky Way is inscribed in the elemental composition of stars, because stars inherit the composition of the gas from which they are formed—in effect, stars "memorize" the element abundance in gas at the time they are formed.


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Post by Dragon Fri Aug 24, 2018 3:49 am



The center of our Milky Way Galaxy, located 26,000 light-years away, houses a black hole as massive as a million suns, surrounded by very dense nest of stars and bright clouds. The density of stars in the innermost regions of the Milky Way is up to one million times greater than in our portion of the galaxy. This region contains extreme and unusual conditions that can influence the types of stars that reside there.

The density of stars and clouds creates streaming patterns. There are large massive star clusters that cannot not be found outside that region. The radiation environment is intense in the galactic center.


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