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In this article, we will be talking about the latest breakthroughs from the Event Horizon Telescope (EHT) collaboration, which have provided unprecedented insights into the relativistic jet emitted by M87*, the supermassive black hole at the center of the Messier 87 galaxy.

M87*: A Giant Among Black Holes

M87*, located roughly 55 million light-years from Earth, is one of the most massive black holes ever observed, with a mass exceeding 6.5 billion Suns. It first gained global attention in 2019 when the EHT captured the first-ever image of a black hole, revealing its now-famous shadow surrounded by a glowing ring of hot gas.

Beyond its size, M87* is notable for producing powerful relativistic jets, streams of charged particles that shoot out from its poles at nearly the speed of light. These jets extend for thousands of light-years and play a critical role in shaping the surrounding galaxy. Understanding exactly where and how these jets originate has been a central goal of astrophysics for decades.

How Scientists Map Black Holes and Jets

In this article, we will be talking about the tools and techniques that made this discovery possible. The EHT uses Very Long Baseline Interferometry (VLBI), a method that combines data from radio telescopes around the globe to form a virtual telescope the size of Earth. This technique allows astronomers to capture extremely high-resolution images of regions near black holes, far beyond what any single telescope could achieve.

Recent observations collected by the EHT in 2021 allowed researchers to examine the base of M87*’s jet in greater detail than ever before. By analyzing emissions at multiple scales—from the black hole’s immediate surroundings to the extended jet—scientists could identify a compact region likely responsible for launching the jet.

Pinpointing the Jet’s Origin

The new data revealed a compact emission region about 0.09 light-years from M87*. Researchers believe this marks the base of the relativistic jet, where the black hole’s intense gravitational pull and magnetic fields accelerate material into space at nearly light speed.

“This study represents an important step in connecting theoretical models of jet formation with direct observations,” said Saurabh, a lead researcher at the Max Planck Institute for Radio Astronomy. Hendrik Müller of the National Radio Astronomy Observatory added, “We have gradually improved resolution with global VLBI experiments over the years, and it is exciting to see the jet’s base starting to come into focus.”