The goal in part is to study the earliest structures of the universe. The COSMOS-Web project - the largest initial JWST research initiative, co-led by Caitlin Casey, an associate professor at UT - aims to map up to 1 million galaxies from a part of the sky the size of three full moons. The galaxy AzTECC71 is clearly visible in the reddest color filter of the NIRCam instrument on the James Webb Space Telescope (F444W, far right), but not at all in the bluest filters (F115W and 150W, left). The team published its findings in The Astrophysical Journal. If that conclusion is confirmed, it could mean the early universe was much dustier than previously thought. It’s potentially telling us there’s a whole population of galaxies that have been hiding from us.” And the fact that even something that extreme is barely visible in the most sensitive imaging from our newest telescope is so exciting to me. “Even though it looks like a little blob, it’s actually forming hundreds of new stars every year. “This thing is a real monster,” said Jed McKinney, a postdoctoral researcher at The University of Texas at Austin. These galaxies were once thought to be extremely rare in the early universe, but this discovery, plus more than a dozen additional candidates in the first half of COSMOS-Web data that have yet to be described in the scientific literature, suggests they might be three to 10 times as common as expected. Or, in other words, a galaxy that’s busy forming many new stars but is shrouded in a dusty veil that’s hard to see through - from nearly 1 billion years after the Big Bang. Now, the ghostly object has reappeared as a faint, yet distinct galaxy in an image from the James Webb Space Telescope.Īstronomers with the COSMOS-Web collaboration have identified the object AzTECC71 as a dusty star-forming galaxy. AUSTIN, Texas - It first appeared as a glowing blob from ground-based telescopes and then vanished completely in images from the Hubble Space Telescope.
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