They walked “the bridge between science and art” to account for imperfections in cameras and use other methods to represent what telescope captured.
Erik Rosolowsky was like a kid at Christmas when the James Webb Space Telescope started sending him long-awaited photos of a distant galaxy.Rosolowsky, an associate professor of physics at the University of Alberta, was among the first Canadian researchers to put the world’s latest and greatest space telescope to use, in his case, by observing star formation in the Triangulum Galaxy, also known as Messier 33.
Instead, the picture for Uncle Mike — a few light blobs on a dark background crisscrossed with banding — looked something like this: For all the meticulous precision that went into the JWST’s design and construction, the data coming from it, in its rawest form, is uneven.Cosmic rays hitting the telescope can create static in the detectors of its cameras, which is corrected for, in part, by capturing multiple versions of the same image.
“That’s what they were doing up there. It’s finally turned on. They’re starting to make images and say, ‘How do we take out all these corrections?’ ” Along the length of that highway, some software processing modules might apply corrections to the data based on inconsistencies or aberrations in the detectors, others might apply corrections based on calibrations for the cameras themselves, and yet others might combine the data from multiple exposures into single images.
“The fact that you are one of the first people to see the image and … process it and put it out for the public — it was a huge honour. And it was also a time to reflect on how far we’ve come, and all the people involved to make it possible.” That’s because the dynamic range of the JWST cameras — the difference between the blacks and the whites in the images — was far too much for even Pagan’s high-end computer monitors to register. The information — the detail in the dark parts of the image — existed, but her monitors weren’t able to perceive it.
The Webb telescope operates in the infrared range of spectrum; that is, past what we see as red, in the section of spectrum with longer wavelengths than we are able to perceive. That has advantages in terms of astronomy; infrared light can often pierce clouds of dust and gas that would block visible light.
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