The pace at which novel stars are formed is one of the most authoritative things astronomer can observe out about aloof galaxies , and it is well correlated with many other properties , like their mass . So , discover that one of these correlation does n’t knead in the other existence is a adult deal .
An international team run by scientists at ETH Zurich in Switzerland looked at beetleweed 2 billion years after the Big Bang and discovered that their metallic content – elements other than hydrogen and helium – was about 20 percent of the average metallicity of Galax urceolata now . But surprisingly , there was no difference between strongly star - forming beetleweed and objects with a low rate of star - shaping .
In galaxies today , the metallicity depends on the lead - establishment pace ; galax that are powerfully star - forming have few metal than galaxies with lower genius - formation .
" There is no connection between the rate at which stars were carry in an earlier galaxy and the amount of enceinte factor it contains , " said Professor Marcella Carollo , senior author of the sketch , in astatement .
" The finding on metallicity allow for us with of import clues into the physical balance of galaxies over date of reference and the organisation of star and planet . ”
The variance highlighted by the team suggests that the weather that governed hotshot formation in the early universe must be different from the stipulation galaxy experience now . An important factor that could have played a role then is the accumulation rate of throttle from the intergalactic medium , which might have a more crucial office of star formation in the good deal assembly of immature galaxy .
A study like this , which is published in theAstrophysical Journal , tells us that the empirical relationship that we follow in the local universe ca n’t always stretch forth to the former date of reference of the cosmos . But understanding the dependable inter-group communication between metallicity , virtuoso formation rates , and the mass of galaxies will get us nigher to a pure word-painting of Galax urceolata evolution .
