A new study led by a joint team at Nagoya University and the National Astronomical Observatory of Japan has measured the cosmic age of a very distant galaxy. The team used the ALMA radio telescope array to detect a radio signal that has been traveling for approximately 97% of the age of the Universe
array in Chile to hunt for a spectral line to confirm the true ages of the galaxies.
ALMA pointed at GHZ2/GLASS-z12 to hunt for an emission line associated with oxygen at the expected frequency suggested by the JWST observations. Oxygen is a typically abundant element in distant galaxies due to its relatively short formation timescale, therefore the team chose to search for an oxygen emission line to increase the chances of detection.
“We were initially concerned about the slight variation in position between the detected oxygen emission line and the galaxy seen by Webb,” author Tom Bakx notes, “but we performed detailed tests on the observations to confirm that this really is a robust detection, and it is very difficult to explain through any other interpretation.”
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