On December 25th, 2021, after many years of anticipation, the James Webb Space Telescope (JWST) finally launched to space. In the sixth-month period that followed, this premier next-generation observatory unfurled its Sunshield, deployed its primary and secondary mirrors, aligned its mirror segments
This is because the light from these ancient galaxies experiences significantby the time it reaches us. This means that as the light travels through spacetime, its wavelength grows longer due to the expansion of the cosmos, effectively shifting it towards the red end of the spectrum. For galaxies whose redshift value is seven or higher – at a distance of 13.46 light-years or more – much of the light will be shifted to the point where it is only visible in the infrared part of the spectrum.
A spectral diagram comparing emitted light from an object to the observed redshifted light. As the Universe expands, it stretches light into lower frequencies or towards the red portion of the spectrum. Credit: NASA/ESA/C. Christian/Z. Levay For their study, Santini and her international team of researchers relied on images acquired by NIRCam on June 28th-29th, 2022, as part of its first set of observations. They then measured the stellar mass of 21 distant galaxies by probing their UV emission and redshifted-optical light.
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