A research team led by University of California Los Angeles astrophysicists recently published their findings in the journal Nature, confirming the existence of the faintest galaxy ever seen from the early universe known as JD1.
Hundreds of millions of years before bright galaxies dominated the universe, things were much darker in a period after the Big Bang known as the cosmic dark ages. According to the research team, JD1 is among the first galaxies to burn away the hydrogen fog leftover from the Big Bang during a period known as the Epoch of Reionization, shining through and creating the universe as we know it today. want to study the first generation of galaxies to understand how the cosmic dark ages ended.
The research team used JWST's powerful near-infrared camera, NIRCam, to photograph JD1 as it was 13.3 billion years ago and the near-infrared spectrograph instrument to determine JD1's age and distance from Earth. According to the study, JD1 is tiny at only a fraction of the size of the Milky Way, our home galaxy. The young galaxy is also incredibly hard to see without the help of a nearby cluster of galaxies known as Abel 2744.
"Before the Webb telescope switched on, just a year ago, we could not even dream of confirming such a faint galaxy," UCLA physics and astronomy professor and study co-author Tommaso Treu said in a news release. "The combination of JWST and the magnifying power of gravitational lensing is a revolution. We are rewriting the book on how galaxies formed and evolved in the immediate aftermath of the Big Bang.
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