'The beacons have been ignited!' A revolutionary system to detect and chart merging black holes
By Jim Shelton
New Haven, CT (SPX) February 8, 2026
A remarkable international alliance of astrophysicists, including researchers from Yale University, has successfully developed and tested an innovative detection system that leverages gravitational waves to identify and map the locations of merging black holes, specifically supermassive black hole binaries, scattered across the cosmos.
This groundbreaking mapping initiative stands to transform our understanding of astronomy and physics, much like the advent of X-ray and radio wave discoveries did in previous generations, according to the researchers involved. The new methodology showcased by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) provides a structured approach to populate this astronomical map.
"Our discovery offers the scientific community its first definitive benchmarks for creating and refining detection protocols aimed at individual, continuous sources of gravitational waves," explained Chiara Mingarelli, an assistant professor of physics within Yale's Faculty of Arts and Sciences (FAS), a key member of NANOGrav and the lead author of a recent study published in the Astrophysical Journal Letters.
The researchers noted that even a limited number of confirmed black hole binaries could serve as anchor points for constructing a comprehensive map of the gravitational wave background. In the coming months, NANOGrav intends to further identify and locate these binaries.
Previous theoretical research spearheaded by Mingarelli and her colleagues indicated that the likelihood of discovering black hole mergers increases fivefold in galaxies hosting a quasar—a luminous beacon in space powered by gases spiraling into a black hole. Guided by this insight, their new study elaborates on a targeted search framework dedicated to detecting continuous gravitational waves emanating from specific black hole merger candidates.
In 2023, NANOGrav made headlines with its findings of the first direct evidence indicating a background of gravitational waves. This finding hinted that gravitational waves produced by slowly merging pairs of supermassive black holes could be detected from Earth amidst a low-frequency energy field.
NANOGrav primarily focused its detection techniques around pulsars, which are the remnants of massive stars that have exploded, leaving behind incredibly dense cores. These rapidly rotating pulsars emit radio signals that are precisely timed.
The international team then shifted its focus to search for individual gravitational waves.
For the study, a team led by Mingarelli employed a novel approach that integrates measurements of the gravitational wave background with variable assessments of quasars. They conducted targeted searches for supermassive black hole binaries in 114 active galactic nuclei—regions at the center of galaxies where black holes actively consume surrounding matter.
This effort led to the identification of two notable binaries: SDSS J1536+0411 (nicknamed "Rohan") and SDSS J0729+4008 (affectionately dubbed "Gondor"), named partly after locations in J.R.R. Tolkien's beloved "The Lord of the Rings" series.
"The names were inspired by a mix of personal connections and pop culture references," Mingarelli remarked. "We chose 'Rohan' first, honoring Rohan Shivakumar, the Yale student who was pivotal in its analysis, and then 'Gondor' because of the iconic moment when the beacons were lit!"
In Tolkien's narrative, the lighting of beacons in Gondor and Rohan symbolizes a call to unite against a common foe.
Mingarelli emphasized that this discovery opens up exciting avenues for various fields within astrophysics research, including gravitational wave theory, data analysis, galaxy mergers, and studies of black hole dynamics.
"Our research has established a clear roadmap for systematically detecting supermassive black hole binaries," she stated. "Through a methodical targeted search, we developed a rigorous protocol which helped us pinpoint two compelling targets that warrant further investigation."
Several Yale researchers contributed to this study, including Priyamvada Natarajan, the Joseph S. and Sophia S. Fruton Professor and Chair of Astronomy, and various students from Yale's Graduate School of Arts and Sciences, as well as Yale College students Rohan Shivakumar, Ellis Eisenberg, and Yu-Ting Chang.
NANOGrav is supported by funding from the National Science Foundation, the Gordon and Betty Moore Foundation, a Discovery Grant from the National Sciences and Engineering Research Council of Canada (NSERC), and the Canadian Institute for Advanced Research.
Research Report: The NANOGrav 15-Year Dataset: Targeted Searches for Supermassive Black Hole Binaries (https://doi.org/10.3847/2041-8213/ae3719)
Related Links
NANOGrav (https://nanograv.org/)
Understanding Time and Space (https://www.spacedaily.com/TimeAndSpace.html)
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