DESI Releases Largest 2D Map of the Universe

Building the Largest 2D Map of the Sky

The newly published DR 11 catalog brings together optical spectra for tens of millions of galaxies and quasars collected over years of observation. According to Lawrence Berkeley National Laboratory scientist David Schlegel, a co-lead of the Legacy Surveys, the dataset forms a fundamental layer of modern astronomy research. Researchers routinely pull up the Legacy Survey Sky Viewer to identify and verify astronomical objects in their fields of view.

The data release spans stars, distant galaxies, black holes, and asteroids across three-quarters of the visible sky. NSF NOIRLab astronomer Arjun Dey notes that while the collaboration relies on these imaging runs to chart the expansion history of the cosmos and local galactic formation, making the portal public ensures that the wider community can access and explore the sky.

Targeting the 3D Structure of the Cosmos

This massive 2D imaging dataset directly enables DESI’s purpose of creating the largest high-resolution 3D map of the Universe. By capturing the location and brightness of galaxies and stars, the imaging surveys allow DESI to select objects and measure their light in different wavelengths to determine their distances.

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This 3D infrastructure will let astronomers map how galaxies cluster across different ages of the Universe. Such measurements play an essential role in limiting how Dark Energy influences cosmic evolution, tracing back to an enigma first revealed when the historic Hubble Space Telescope captured the deepest universe imagery available at that time.

Challenging Assumptions About Dark Energy

Preliminary findings drawn from the DESI Legacy Imaging Surveys suggest that the influence wielded by Dark Energy could be diminishing over time. This contradicts previous findings that suggested Dark Energy is accelerating, which has profound implications for cosmological models. Rather than expanding endlessly until every star in the Cosmos perishes, cosmic expansion might halt in epochs far ahead, settling instead into a balanced equilibrium.

Beyond mapping dark energy and Dark Matter—the mysterious substance that accounts for 85% of the mass in our Universe—the DR 11 dataset aids research into rare transients. Astronomers studying gravitational lenses, supernovae, fast radio bursts (FRBs), and gamma-ray bursts (GRBs) rely on these deep optical surveys to spot changes and host galaxies.

Preparing for Petabytes of Next-Generation Data

The unprecedented volume of data contained in the Legacy Surveys also serves as a training ground for machine learning and AI tools to analyze petabytes of raw astronomical data. Scientists need automated tools to parse petabytes of raw astronomical data generated by current instruments and upcoming facilities.

Next-generation installations will push data collection to new extremes. The Vera C. Rubin Observatory’s ten-year Legacy Survey of Space and Time (LSST) will gather about 10 terabytes of data every night. Concurrently, NASA’s Nancy Grace Roman Space Telescope is expected to generate roughly 20 petabytes (2,500 terabytes) of data during its five-year primary mission.

With DESI planning to release upgraded findings from its initial five-year run in 2027 alongside ongoing observations stretching into 2028, these Legacy Surveys serve as a foundational anchor for processing and calibrating those incoming waves of data.

Frequently Asked Questions

What is the DESI Legacy Imaging Surveys DR 11 map?

It is the eleventh data release from the DESI Legacy Imaging Surveys team, providing a 5.6-trillion-pixel 2D map covering about 75% of the sky and cataloging nearly four billion celestial objects.

Where can the public view the DESI map?

The map is publicly accessible through the Legacy Survey Sky Viewer, and the searchable full catalog is hosted by the Astro Data Lab at the Community Science and Data Center (CSDC).

How does the 2D map help study dark energy?

The imaging data provides the location and brightness of galaxies and stars, enabling DESI to select objects and measure their light in different wavelengths to determine their distances, which will fulfill DESI’s purpose of creating the largest high-resolution 3D map of the Universe used to study how galaxies have clustered across different ages of the Universe.