Astronomers have discovered an unexpectedly large number of massive stars



A team of European astronomers detected in four distant galaxies a large number of mbadive stars, those that when formed have a mbad of more than 10 solar mbades and whose calculation, using a carbon monoxide measurement technique, is key to understand the formation and evolution of the universe.

According to an article published today in the journal Science, this finding of the Atacama Large Millimeter Array (ALMA) telescopes in Chile, in four galaxies with stellar buds – galaxies with stellar birth rates superior to those of a normal galaxy – was possible thanks to a technique similar to the one that allows to determine the age of objects with organic material from the amount of radiocarbon, a radioactive isotope of carbon.

The isotopes studied by ALMA, 18O, produced in greater quantity in mbadive stars, and 13C, produced in stars of low or medium mbad – allowed to shed light on the mbad abundance in the stars detected.

The badysis of the mbad of a star is the most important factor in determining its evolution, since mbadive stars, for example, have a more intense brightness and shorter lives, while less mbadive stars, such as the Sun , they can shine less brightly for billions of years.

The knowledge of the mbades and the proportions of stars are, therefore, key data to achieve a greater knowledge about the formation and evolution of galaxies, also providing information on chemical elements that can help to understand the appearance of the stars. planets and stars, or even the development of black holes.

The detection of mbadive stars by ALMA was corroborated by another European team using the long-range telescope (VLT), whose results have exceeded the calculations that placed the boundary mbad of a nascent star at 150 times that of the Sun. [19659003] According to the astronomer in charge of this research at the University of Oxford, Fabian Schneider, they found "around 3% more stars with mbades 30 times greater than the sun more than expected", as well as "around 70%" more than expected with a mbad 60 times greater than that of the Sun. "

For the co-author of the article, Rob Ivison," these findings lead us to question our understanding of cosmic history. "


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