Spitzer, Max Planck Institute, Dorn discussed on SpaceTime with Stuart Gary


A new study claims. The first stas began shining between two hundred fifty and three hundred and fifty million years after the big bang. Thirteen point eight. Two billion years ago. The findings reported in the monthly notices the roster society abased study of six of the most distant galaxies currently known galaxies whose light has taken almost the entire existence of the universe to reach here. The authors found that the distance of these galaxies away from earth corresponded to a look. Back time of more than thirty billion years an era when the universe was only five hundred and fifty million years old analyzing images from the hobbling spitzer space telescopes the authors were able to calculate the age of each of these galaxies ranging from somewhere around two hundred to three hundred million years and that allow them to estimate when they first formed stars the birth of the first ever stars known as cosmic dorn was a key event in the evolution of the universe. See it mac. The end of the cosmic dark ages the time before the first star sean and the ultraviolet light from those very first is triggered the beginning of cosmic reorganization the process that would eventually make the universe transparent and look the way it does today to determine the age of cosmic dawn the authors allies stylized from the galaxies as recorded by the hobbling spitzer space telescopes. They were looking for a macher in this spectrum which is indicative of the presence of tummy hydrogen in stellar atmospheres. This provided an estimate of the age of the stars see the hydrogen signature increases in strength as the still population ages but then it diminishes again when galaxies all around a billion years at age dependence arises because the more massive population three stars which contribute to this signal burn through their nuclear fuel fairly rapidly and therefore the i die one of the study's authors remand maya from university college london and the max planck institute in heidelberg says the same age indicators used to date stars earned still a neighborhood in the milky way and it can just as easily be used date extremely remote galaxies in the very early universe using this indicator astronomers could infer that the six galaxies hosting the stars must've already between two hundred three hundred million years old in analyzing the data from avalanche spitzer the authors needed to estimate the redshift of each galaxy which indicates their cosmological distance and hence the lookback time at which they were being observed. Redshift is a signature of how much the universe has expanded since the big bang to achieve this myron colleagues undertook spectroscopy measurements using a full armory of powerful ground based telescopes these included alma. The atacama large millimeter submillimeter array radio telescope. Vlt or very large telescope array. The twin kick telescopes in hawaii. And the i south telescope combining these measurements. Allow the team to confirm that looking at these. Galaxies corresponded to looking back in time to when the universe was just five hundred and fifty million years old over the past. Decade astronomers have been push back the frontiers of what they can observe two time when the universe was just four percent of its age however you to the limits of transparency and its atmosphere and the capabilities of the hobbling spitzer space telescopes. Astronomers of now pretty. Well reached the limit of their abilities with the present technology. However all that should change with the launch in november of nasr's new hobble replacement the james webb space telescope the authors believed james webb will have the capability to directly witnessed the cosmic dawn and the birth of the very first stars between two hundred fifty and three hundred and fifty million years after the very beginning of the universe..

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