Earlyuniverse crackled with bursts of star formation, Webb Telescope shows NASAGoddard
As part of the JADES program, Endsley and his colleagues studied these galaxies with Webb's NIRSpec instrument to look for signatures of star formation—and found them in abundance."Almost every single galaxy that we are finding shows these unusually strong emission line signatures indicating intense recent star formation.
Endsley and his colleagues also found evidence that these young galaxies underwent periods of rapid star formation interspersed with quiet periods where fewer stars formed. These fits and starts may have occurred as galaxies captured clumps of the gaseous raw materials needed to form stars. Alternatively, since massive stars quickly explode, they may have injected energy into the surrounding environment periodically, preventing gas from condensing to form new stars.
Kevin Hainline of the University of Arizona in Tucson and his colleagues used Webb's NIRCam instrument to obtain these measurements, called photometric redshifts, and identified more than 700 candidate galaxies that existed when the universe was between 370 million and 650 million years old. The sheer number of these galaxies was far beyond predictions from observations made before Webb's launch.
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