![]() While a Roman ultra-deep field would be just as sharp as Hubble's and peer equally far back in time, it could reveal an area 300 times larger, offering a much broader view of cosmic ecosystems. The new simulation showcases Roman's power to perform a similar observation on a much larger scale, revealing millions of galaxies instead of thousands. Hubble's Ultra Deep Field offers an incredible window to the early universe, but an extremely narrow one, covering less than one ten millionth of the whole sky. The resulting image helped us see more than 13 billion years back in time. The Hubble team harnessed the power of a long exposure time-hundreds of hours between 20-which allowed the telescope to collect more light than it could in a single, short observation. "Our study helps demonstrate what a Roman ultra-deep field could tell us about the universe, while providing a tool for the scientific community to extract the most value from such a program."īy capturing the Hubble Ultra Deep Field image, astronomers pulled aside the cosmic curtains to reveal that a tiny, seemingly empty slice of the sky was actually teeming with thousands of galaxies, each containing billions of stars. "Roman has the unique ability to image very large areas of the sky, which allows us to see the environments around galaxies in the early universe," said Nicole Drakos, a postdoctoral scholar at the University of California Santa Cruz, who led the study. This Hubble observation transformed our view of the early universe, revealing galaxies that formed just a few hundred million years after the big bang. Credit: Nicole Drakos, Bruno Villasenor, Brant Robertson, Ryan Hausen, Mark Dickinson, Henry Ferguson, Steven Furlanetto, Jenny Greene, Piero Madau, Alice Shapley, Daniel Stark, Risa WechslerĪ team of astrophysicists has created a simulated image that shows how the Nancy Grace Roman Space Telescope could conduct a mega-exposure similar to but far larger than Hubble's celebrated Ultra Deep Field Image. ![]() The large area Roman will observe will also show differences in galaxy properties based on their surrounding environment, allowing astronomers to better understand how early galaxies formed. The mission’s wide field of view will provide an incredible amount of data, helping astronomers find rare objects in the epoch of reionization. ![]() Such distant galaxies are extremely faint, so Roman would have to stare at one spot in space for several days to collect enough light from them. Roman could peer across more than 13 billion years of cosmic history, reaching back to when the universe was only about half a billion years old. The image, which contains more than 10 million galaxies, was constructed from a simulation that produced a realistic distribution of the galaxies in the universe. The inset at the lower-right zooms into one of the squares of Roman's footprint, and the inset at the lower-left zooms in even further. ![]() The 18 squares at the top of this image outline the area Roman can see in a single observation, known as its footprint. This synthetic image visualizes what a Roman ultra-deep field could look like. ![]()
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