On Oct. 11, 2022, NASA's James Webb Space Telescope spent over 20 hours observing the long-studied Hubble Ultra Deep Field for the first time. The general observer program (GO 1963) focused on analyzing the field in wavelengths between approximately 2 and 4 microns.
This image of the Hubble Ultra Deep Field was taken by the Near-Infrared Camera on NASA’s James Webb Space Telescope. The Webb image observes the field at depths comparable to Hubble – revealing galaxies of similar faintness—in just one-tenth as much observing time. It includes 1.8-micron light shown in blue, 2.1-micron light shown in green, 4.3-micron light shown in yellow, 4.6-micron light shown in orange, and 4.8-micron light shown in red . Credit: NASA, ESA, CSA, STScI, C. Williams .
We spoke with Christina Williams , Sandro Tacchella , and Michael Maseda to learn more about the first observation of the Hubble Ultra Deep Field through Webb's eyes.Michael Maseda: The fact that we see hot, ionized gas is telling us exactly where stars are being born in these galaxies. Now we can separate those areas from where stars already existed.
Michael Maseda: The capabilities that we have with Webb's medium-band filters are actually quite new. We're getting a sort of hybrid between imaging and spectroscopy, so we're getting detailed information for basically all of the galaxies in the field, as opposed to traditional spectroscopy where you could only select a few galaxies in the field of view for study.
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