Milky Way stars were born less – BBC

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Researchers from France and the United States, studying the chemical composition of 10 thousand stars of our galaxy, found that the rate of star formation in it sharply decreased during the period of about 9 billion years ago. Once star formation has resumed, but is much slower. An article on this was published in the journal Astronomy & amp; Astrophysics.

Using data from a high-resolution spectrograph SDSS survey, astrophysicists have estimated the chemical composition and the age of 10 thousand stars of our galaxy. Studies have shown that between 10 billion to 8 billion years ago, the pace of star formation suddenly fell on the order. In the future star formation was resumed, but at a slower pace.

The researchers note that at this time in our galaxy formed the so-called bar – a jumper consisting of brightest stars, which goes from the center of the galaxy, and crosses in the middle. The spiral arms in these galaxies start at the ends of bridges, while in ordinary spiral galaxies they come directly from the kernel

«The star -. This confrontation between gravity and the other forces, such as turbulence, – says Katherine Alatalo, Carnegie Observatory in Pasadena. – Galactic bar feeding gas energy, creating in him the turbulent instability that prevents the birth of new stars »

Scientists believe that in this way, star formation in the galaxy may stop altogether, although it may be large reserves. . gas

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