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NASA’s Roman Team Selects Survey to Map Our Galaxy’s Far Side


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A skinny, horizontal image with a dark, dusty band in the middle spanning from the left edge to the right. Smoky wisps extend hazily out from the central, disconnected dark line. Tiny stars speckle the grayish background and a warm glow emanates from behind the dark band in the middle.
The plane of our Milky Way galaxy, as seen by ESA’s Gaia space mission. It contains more than a billion stars, along with darker, dusty regions Gaia couldn’t see through. With its greater sensitivity and longer wavelength coverage, NASA’s Nancy Grace Roman Space Telescope’s galactic plane survey will peer through more of the dust and reveal far more stars.
Credit: ESA/Gaia/DPAC

NASA’s Nancy Grace Roman Space Telescope team has announced plans for an unprecedented survey of the plane of our Milky Way galaxy. It will peer deeper into this region than any other survey, mapping more of our galaxy’s stars than all previous observations combined.

“There’s a really broad range of science we can explore with this type of survey, from star formation and evolution to dust in between stars and the dynamics of the heart of the galaxy,” said Catherine Zucker, an astrophysicist at the Center for Astrophysics | Harvard & Smithsonian in Cambridge, Massachusetts, who co-authored a white paper describing some of the benefits of such an observing program.

Scientists have studied our solar system’s neighborhood pretty well, but much of the galaxy remains shrouded from view. NASA’s Nancy Grace Roman Space Telescope will peer through thick bands of dust to reveal parts of our galaxy we’ve never been able to explore before, thanks to a newly selected galactic plane survey. Credit: NASA’s Goddard Space Flight Center

A galactic plane survey was the top-ranked submission following a 2021 call for Roman survey ideas. Now, the scientific community will work together to design the observational program ahead of Roman’s launch by May 2027.

“There will be lots of trade-offs since scientists will have to choose between, for example, how much area to cover and how completely to map it in all the different possible filters,” said paper co-author Robert Benjamin, an astronomer at the University of Wisconsin-Whitewater.

While the details of the survey remain to be determined, scientists say if it covered about 1,000 square degrees – a region of sky as large as 5,000 full moons – it could reveal well over 100 billion cosmic objects (mainly stars).

“That would be pretty close to a complete census of all the stars in our galaxy, and it would only take around a month,” said Roberta Paladini, a senior research scientist at Caltech/IPAC in Pasadena, California, and the white paper’s lead author. “It would take decades to observe such a large patch of the sky with the Hubble or James Webb space telescopes. Roman will be a survey machine!”

Milky Way Anatomy

Observatories with smaller views of space have provided exquisite images of other galaxies, revealing complex structures. But studying our own galaxy’s anatomy is surprisingly difficult. The plane of the Milky Way covers such a large area on the sky that studying it in detail can take a very long time. Astronomers also must peer through thick dust that obscures distant starlight.

While we’ve studied our solar system’s neighborhood well, Zucker says, “we have basically no idea what the other half of that Milky Way looks like beyond the galactic center.”

Observatories like NASA’s retired Spitzer Space Telescope have conducted shallower surveys of the galactic plane and revealed some star-forming regions on the far side of the galaxy. But it couldn’t resolve fine details like Roman will do.

“Spitzer set up the questions that Roman will be able to solve,” Benjamin said.

Roman’s combination of a large field of view, crisp resolution, and the ability to peer through dust make it the ideal instrument to study the Milky Way. And seeing stars in different wavelengths of light – optical and infrared – will help astronomers learn things such as the stars’ temperatures. That one piece of information unlocks much more data, from the star’s evolutionary stage and composition to its luminosity and size.

“We can do very detailed studies of things like star formation and the structure of our own galaxy in a way that we can’t do for any other galaxy,” Paladini said.

wh.png?w=1770
This image shows two views of the same spiral galaxy, called IC 5332, as seen by two NASA observatories – the James Webb Space Telescope’s observations appear at the top left and the Hubble Space Telescope’s at the bottom right. The views are mainly so different due to the wavelengths of light they each showcase. Hubble’s visible and ultraviolet observation features dark regions where dust absorbs those types of light. Webb sees longer wavelengths and detects that dust glowing in infrared. But neither could conduct an efficient survey of our Milky Way galaxy because it covers so much sky area; since IC 5332 is around 30 million light-years away, it appears as a small spot. It would take Hubble or Webb decades to survey the Milky Way, but NASA’s upcoming Nancy Grace Roman Space Telescope could do it in less than a month.
Credit: NASA, ESA, CSA, STScI, Janice Lee (STScI), Thomas Williams (Oxford), Rupali Chandar (UToledo), PHANGS Team

Roman will offer new insights about the structure of the central region known as the bulge, the “bar” that stretches across it, and the spiral arms that extend from it.

“We’ll basically rewrite the 3D picture of the far side of the galaxy,” Zucker said.

Roman’s sharp vision will help astronomers see individual stars even in stellar nurseries on the far side of the galaxy. That will help Roman generate a huge new catalog of stars since it will be able to map 10 times farther than previous precision mapping by ESA’s (the European Space Agency’s) Gaia space mission. Gaia mapped over 1 billion stars in 3D largely within about 10,000 light-years. Roman could map up to 100 billion stars 100,000 light-years away or more (stretching out to the most distant edge of our galaxy and beyond).

The Galactic Plane Survey is Roman’s first announced general astrophysics survey – one of several observation programs Roman will do in addition to its three core community surveys and Coronagraph technology demonstration. At least 25% of Roman’s five-year primary mission will be allocated to general astrophysics surveys in order to pursue science that can’t be done with only the mission’s core community survey data. Astronomers from all over the world will have the opportunity to use Roman and propose cutting-edge research, enabling the astronomical community to utilize the full potential of Roman’s capabilities to conduct extraordinary science.

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 BAE Systems in Boulder, Colorado; L3Harris Technologies in Melbourne, Florida; and Teledyne Scientific & Imaging in Thousand Oaks, California.

Download high-resolution video and images from NASA’s Scientific Visualization Studio

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

Media contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, Md.
claire.andreoli@nasa.gov
301-286-1940

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