Distant galaxies reveal the secret of the formation of stars in the Universe

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2019-12-23 03:40:06

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Distant galaxies reveal the secret of the formation of stars in the Universe

the New radio image is covered by points, each of which represents a distant galaxy. Numerous dim point, filling the sky — it is a distant galaxy similar to the milky Way that we see for the first time

Have you Heard anything about when the era with an incredibly beautiful name “cosmic noon” (cosmic noon)? It is believed that between 8 and 11 billion years ago in this era formed the first stars. Today we don't know much about these amazing processes and to find out more, you need to look at the past , the age of which has about 13.7 billion years. Fortunately, thanks to scientific and technical progress today we have the opportunity. Recently, an international team of astronomers using the radio telescope of the South African radio astronomy Observatory (SARAO) have discovered a distant galaxy similar to the milky Way. Astronomers believe that these galaxies responsible for the bulk of star formation in the Universe. The work will be published in the Astrophysical journal. The study can be found on the preprints .

As the site SARAO, it was not easy for astronomers to study faint light of the space era noon. Optical telescopes can see light from very distant galaxies, but new largely hidden from us in the dusty gas clouds. Radio telescopes can see through dust and see a rare bright star in the galaxy, but until now have not been sensitive enough to detect signals from distant galaxies. Fortunately, the MeerKat radio telescope was able to observe distant galaxy resembling the milky Way.

The Team used the 64 dish MeerKAT radio telescope for observing the selected area, which lasted a total of 130 hours. The resulting image shows the area of the sky that is comparable in size with five full moons that contains tens of thousands of galaxies. Since radio waves propagate at the speed of light, this image is a time machine, which for billions of years, explores star formation in the distant . Note that only stars whose life cycle is less than 30 million years emit radio waves, allowing the researchers were able to conclude that the image a lot of old stars. Therefore, radosvet that we see from each galaxy is proportional to its speed of star formation in this point in time.

the MeerKat radio Telescope peers into the starry sky. Astronomers want to use the resulting image to learn more about star formation in the Universe

Thanks to the result, it became known that the rate of star formation near the space of the afternoon is even higher than originally anticipated. In the past scientists could only fix the tip of the iceberg — a rare and luminous galaxies, which produced only a small fraction of stars in the . Now we see the full picture: dull point on the image — this galaxy, which formed most of the stars.

Experts note that over the past few years, technology has evolved to such an extent that the establishment of such telescopes as possible. Their computational power allow researchers to gain a real understanding of how it has become what it is. Thus, we can safely assume that the next generation of telescopes will be even more impressive.

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