JWST wide field image. Image:
NASA, ESA, CSA, and STSci
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This epic astronomical nerdout has been exhilarating, but some of the finer details of the telescope’s calibration process may have been overlooked in the midst of the excitement. Adams noted that the researchers who are in charge of the telescope’s daily operations issued an early report that JWST’s Near Infrared Camera (NIRCam) instrument is so good at capturing red wavelengths that this part of the spectrum appears brighter than expected in its images. “JWST is a brand new instrument and we're still trying to get to grips with understanding how to process the data and what it means,” Adams said. “When the first images came out, it was a bit of an ‘astronomers at Christmas’ scenario with everyone diving in to see what they could find.”“What I think flew under the radar of a lot of astronomers was that a part of that report mentions that NIRCam (one of the main cameras on the telescope) was overperforming in its reddest wavelengths,” he continued. “This is good news in the long term as it means we can go deeper than originally expected towards the redder wavelengths of light, however there was a catch for the short term that many missed.” “The analysis pipeline that had been made for JWST didn't account for that overperformance until an update on 2022-07-29, and so instead many people were measuring galaxies to be brighter in the redder wavelengths by approximately 20 percent than they really were for the first few weeks,” Adams said.
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