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NASA’s Roman Mission Gears Up for a Torrent of Future Data


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NASA’s Nancy Grace Roman Space Telescope team is exploring ways to support community efforts that will prepare for the deluge of data the mission will return. Recently selected infrastructure teams will serve a vital role in the preliminary work by creating simulations, scouting the skies with other telescopes, calibrating Roman’s components, and much more.

Their work will complement additional efforts by other teams and individuals around the world, who will join forces to maximize Roman’s scientific potential. The goal is to ensure that, when the mission launches by May 2027, scientists will already have the tools they need to uncover billions of cosmic objects and help untangle mysteries like dark energy.

“We’re harnessing the science community at large to lay a foundation, so when we get to launch we’ll be able to do powerful science right out of the gate,” said Julie McEnery, Roman’s senior project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “There’s a lot of exciting work to do, and many different ways for scientists to get involved.”

Thousands of tiny red dots speckle a black background like spilled salt. Additional yellow blobs that are slightly larger and appear more like galaxies, are overlaid on top and a few areas appear to bloom outward and slightly warp. Then even more galaxies, this time yellow and white, are overlaid over that, and the other areas "bloom" with even more exaggerated effects, the edges of the circular areas appearing to be smeared into arcs and streaks while the inside of the areas are magnified.
This animation shows a simulation of the type of science that astronomers will be able to do with future deep field observations from NASA’s Nancy Grace Roman Space Telescope. The gravity of intervening galaxy clusters and dark matter can lens the light from farther objects, warping their appearance as shown in the animation. By studying the distorted light, astronomers can study elusive dark matter, which can only be measured indirectly through its gravitational effects on visible matter. As a bonus, this lensing also makes it easier to see the most distant galaxies whose light they magnify. Simulations like this one help astronomers understand what Roman’s future observations could tell us about the universe, and provide useful data to validate data analysis techniques.
Credit: Caltech-IPAC/R. Hurt

Simulations lie at the heart of the preparatory efforts. They enable scientists to test algorithms, estimate Roman’s scientific return, and fine-tune observing strategies so that we’ll learn as much as possible about the universe.

Teams will be able to sprinkle different cosmic phenomena through a simulated dataset and then run machine learning algorithms to see how well they can automatically find the phenomena. Developing fast and efficient ways to identify underlying patterns will be vital given Roman’s enormous data collection rate. The mission is expected to amass 20,000 terabytes (20 petabytes) of observations containing trillions of individual measurements of stars and galaxies over the course of its five-year primary mission.

“The preparatory work is complex, partly because everything Roman will do is quite interconnected,” McEnery said. “Each observation is going to be used by multiple teams for very different science cases, so we’re creating an environment that makes it as easy as possible for scientists to collaborate.”

Some scientists will conduct precursor observations using other telescopes, including NASA’s Hubble Space Telescope, the Keck Observatory in Hawaii, and Japan’s PRIME (Prime-focus Infrared Microlensing Experiment) located in the South African Astronomical Observatory in Sutherland. These observations will help astronomers optimize Roman’s observing plan by identifying the best individual targets and regions of space for Roman and better understand the data the mission is expected to deliver.

Some teams will explore how they might combine data from different observatories and use multiple telescopes in tandem. For example, using PRIME and Roman together would help astronomers learn more about objects found via warped space-time. And Roman scientists will be able to lean on archived Hubble data to look back in time and see where cosmic objects were and how they were behaving, building a more complete history of the objects astronomers will use Roman to study. Roman will also identify interesting targets that observatories such as NASA’s James Webb Space Telescope can zoom in on for more detailed studies.

A series of images showing wispy stellar streams surrounding eight individual galaxies. Light and dark are reversed so that the background is gray-white and the galaxies appear as black blobs. Extending out from each like tentacles are streams of stars.
This series of images shows how astronomers find stellar streams by reversing the light and dark, similar to negative images, but stretched to highlight the faint streams. Color images of each of the nearby galaxies featured are superposed to scale to highlight the easily visible disk. Galaxies are surrounded by enormous halos of hot gas sprinkled with sporadic stars, seen as the shadowy regions that encase each galaxy here. NASA’s upcoming Nancy Grace Roman Space Telescope is expected to improve on these observations by resolving individual stars to understand each stream’s stellar populations and see stellar streams of various sizes in even more galaxies.
Credit: Carlin et al. (2016), based on images from Martínez-Delgado et al. (2008, 2010)

It will take many teams working in parallel to plan for each Roman science case. “Scientists can take something Roman will explore, like wispy streams of stars that extend far beyond the apparent edges of many galaxies, and consider all of the things needed to study them really well,” said Dominic Benford, Roman’s program scientist at NASA Headquarters in Washington, D.C. “That could include algorithms for dim objects, developing ways to measure star positions very precisely, understanding how detector effects could influence the observations and knowing how to correct for them, coming up with the most effective strategy to image stellar streams, and much more.”

One group is developing processing and analysis software for Roman’s Coronagraph Instrument. This instrument will demonstrate several cutting-edge technologies that could help astronomers directly image planets beyond our solar system. This team will also simulate different objects and planetary systems the Coronagraph could unveil, from dusty disks surrounding stars to old, cold worlds similar to Jupiter.

The mission’s science centers are gearing up to manage Roman’s data pipeline and archive and establishing systems to plan and execute observations. As part of a separate, upcoming effort, they will convene a survey definition team that will take in all of the preparatory information scientists are generating now and all the interests from the broader astronomical community to determine Roman’s optimal observation plans in detail.

“The team is looking forward to coordinating and funneling all the preliminary work,” McEnery said. “It’s a challenging but also exciting opportunity to set the stage for Roman and ensure each of its future observations will contribute to a wealth of scientific discoveries.”

The Nancy Grace Roman Space Telescope is managed at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, with participation by NASA’s Jet Propulsion Laboratory and Caltech/IPAC in Southern California, the Space Telescope Science Institute in Baltimore, and a science team comprising scientists from various research institutions. The primary industrial partners are Ball Aerospace and Technologies Corporation in Boulder, Colorado; L3Harris Technologies in Melbourne, Florida; and Teledyne Scientific & Imaging in Thousand Oaks, California.

By Ashley Balzer
NASA’s Goddard Space Flight Center, Greenbelt, Md.

Media contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, Md.
301-286-1940

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