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NASA says Hubble is collecting sharp images of gravitational lenses and helping build computer models to analyze them ahead of science with the Nancy Grace Roman Space Telescope. Roman is expected to find a much larger sample across its wide field of view, while Hubble can study selected lenses in greater detail and follow up on promising discoveries.
NASA’s Hubble Space Telescope is imaging gravitational lenses to help astronomers prepare for observations with the Nancy Grace Roman Space Telescope, whose wide view of the sky is expected to reveal a larger sample of these systems. NASA says Hubble’s detailed images are being used to build computer models for analyzing how foreground galaxies bend light, a method that can help researchers estimate their mass and study the dark matter they contain.
In an image highlighted in its report, NASA shows a foreground elliptical galaxy about 4.5 billion light-years away lensing light from a background galaxy roughly 8 billion light-years away. NASA describes the background galaxy as appearing in two arcs: a prominent arc above and to the left of the foreground galaxy, and a smaller, flipped image below and to the right. The agency calls this arrangement an arc-counterarc pair.
NASA explains that gravitational lensing occurs when the mass of a foreground object bends spacetime and redirects light from an object behind it. In a suitably aligned pair of galaxies, the background galaxy’s light can be distorted and magnified. Researchers can use the shape of that distortion to estimate the foreground galaxy’s mass. According to NASA, visible matter alone does not account for the observed lensing in such systems, allowing astronomers to infer the contribution of dark matter.
NASA presents the featured lens as part of a broader set of Hubble observations, not as a newly discovered phenomenon. The agency says astronomers are using Hubble’s high-resolution images to develop a computer model that can help interpret the larger images Roman is expected to collect. NASA also says Hubble will make follow-up observations of interesting lenses identified by Roman, pairing detailed views with a broader survey.
How Hubble Prepares Roman’s Lens Survey
The work addresses a practical challenge in using Roman’s wide field of view: finding many candidate lenses is only useful if researchers can interpret their distorted images reliably. NASA says Hubble’s sharper views can help astronomers construct and test analysis methods before applying them to Roman’s much larger sample.
That larger sample could give researchers more opportunities to measure the mass of foreground galaxies and compare the effects of visible matter with the inferred presence of dark matter. NASA’s report describes a research strategy, rather than results from Roman: its value will depend on the quality of the models and the observations the telescope ultimately gathers. NASA also describes Hubble’s role in examining selected Roman discoveries in greater detail.
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Two Telescopes, Different Views
NASA says Hubble observes primarily in visible and ultraviolet light, with some infrared coverage. Roman will observe mainly in infrared wavelengths, as well as some visible light.
The telescopes also differ in scale of view. NASA describes Hubble as able to provide high-resolution images of individual targets, while Roman’s wider field is suited to taking broad panoramas and surveying many objects. The agency presents the telescopes as complementary: Roman can locate a greater number of lens candidates, and Hubble can help inspect selected examples at higher resolution. NASA’s image description also identifies a barred spiral galaxy comparable in size to the Milky Way; the lensing system, however, is the focus of the preparation work.
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What Roman’s Survey Will Establish
NASA’s report does not provide a count of lenses already observed for this preparation effort, a forecast for how many Roman will detect, or quantitative performance results for the computer model. It also does not give a timetable for when Roman’s lens survey or Hubble follow-up observations will begin.
NASA describes how lensing distortions can be used to estimate galaxy mass and infer dark matter, but the report does not present a new mass measurement for the featured foreground galaxy. The exact results from Roman will depend on the observations and subsequent analysis; the telescope’s expected larger sample is a stated goal, not a result reported here.
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From Hubble Models to Roman Data
NASA says astronomers will continue using Hubble lens images to develop tools for analyzing gravitational distortions. Those tools are intended to support analysis of Roman’s broader imaging data once Roman observations are available.
NASA expects Roman to identify lens candidates across a wider area of the sky, after which researchers can use Hubble to follow up on selected systems. That sequence would combine Roman’s survey reach with Hubble’s detailed imaging. NASA has not specified in this report when particular follow-up targets or model results will be released.
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Key Questions
What is a gravitational lens?
A gravitational lens forms when the mass of a foreground object bends light from a more distant object behind it. The bending can distort or magnify the background object’s image.
What does the Hubble image show?
NASA’s featured image includes a foreground elliptical galaxy about 4.5 billion light-years away and a more distant galaxy about 8 billion light-years away. NASA describes the background galaxy’s light as appearing in two arcs, an arrangement it calls an arc-counterarc pair.
How can lensing help researchers study dark matter?
Researchers use the distortion of a background galaxy’s light to estimate the mass of the foreground galaxy. NASA says visible matter alone does not explain the observed distortion in these systems, so the measurements can help estimate the dark matter contribution.
How will Hubble and Roman work together?
NASA expects Roman’s wider view to find more lens candidates, while Hubble can provide sharper images of individual systems. The agency says Hubble observations are also helping build a computer model for analyzing Roman’s images and will be used to follow up on interesting lenses Roman detects.
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