Astronomers Capture First-Ever Image of Two Orbiting Black Holes in Distant Quasar
For the first time in history, scientists have directly observed two black holes locked in a mutual orbit, confirming a long-suspected cosmic phenomenon. The discovery,...
For the first time in history, scientists have directly observed two black holes locked in a mutual orbit, confirming a long-suspected cosmic phenomenon. The discovery, led by Mauri Valtonen from the University of Turku in Finland, along with Indian researchers Alok C. Gupta and Shubham Kishore from ARIES, Nainital, and A. Gopakumar from TIFR, Mumbai, focuses on the quasar OJ287, located about 5 billion light-years away.
A Century-Long Mystery Comes into Focus
Quasars are among the universe’s most energetic objects, with supermassive black holes at their centers feeding on surrounding gas and dust that glows brightly. OJ287 has intrigued astronomers for decades due to its periodic flickering, documented in photographic plates dating back to the 19th century.
Scientists had long hypothesized that the rhythmic brightness changes were caused by two black holes orbiting each other every 12 years. Earlier modeling in 2018 and 2021 by teams at TIFR and the University of Turku predicted the orbit precisely, but direct observational proof remained elusive—until now.
A Global Observing Effort
The breakthrough came from a coordinated network of telescopes, including NASA’s TESS satellite, multiple ground-based observatories, and the Russian-led RadioAstron mission, which uses a radio antenna orbiting Earth. Remarkably, RadioAstron achieved higher resolution than the Event Horizon Telescope, which famously imaged the black holes in Messier 87 and our Milky Way’s Sagittarius A*.
The radio observations revealed two distinct bright points exactly where the theoretical models predicted—the smaller black hole launching a twisting jet of high-energy particles as it orbited its larger companion.
“This is a historic milestone in astrophysics,” said Valtonen. “We now have direct evidence of a binary black hole system, confirming what decades of indirect observations had suggested.”
Implications for Astrophysics
Studying OJ287 offers a rare opportunity to understand the dynamics of supermassive black holes and the behavior of matter and energy under extreme conditions. As the two black holes continue their cosmic dance, scientists will monitor the wobble of the jet, offering insights into orbital mechanics and magnetic interactions.
Eventually, the pair is expected to merge, producing powerful gravitational waves detectable by observatories like LIGO and Virgo. Such events not only reshape their immediate surroundings but also offer critical tests of Einstein’s theory of general relativity.
ARIES, an autonomous Indian institute under the Department of Science and Technology, played a key role in this discovery, highlighting India’s growing contribution to international space research.