Scientists have made a groundbreaking discovery that could help solve the mystery of the universe’s missing matter. A team of astronomers, led by doctoral student Vishwangi Shah from McGill University, observed a fast radio burst (FRB) originating from an unexpected location – the outskirts of a “dead” galaxy. FRBs are brief but powerful pulses of energy that travel vast cosmic distances.
These bursts interact differently with baryonic matter, which is the ordinary matter that makes up stars, planets, and galaxies, compared to dark matter. By studying how FRBs are affected by baryonic matter, scientists can map out the distribution of this elusive substance in the universe. According to the Lambda Cold Dark Matter model, baryonic matter should make up about 5% of the universe’s total mass and energy.
However, only about 70% of this predicted matter had been observed, leading to the “missing baryon problem.”
Astrophysicists had expected to find the missing baryonic matter in the form of hot plasma between galaxies, known as the warm-hot intergalactic medium.
Radio burst illuminates cosmic matter map
But detecting this diffuse and faint material is extremely challenging.
The discovery of FRBs in 2007 by Duncan Lorimer has provided a new tool for probing the universe’s missing matter. These bursts are incredibly energy-dense, releasing more power in a millisecond than the Sun does in three days. By using FRBs to trace the distribution of baryonic matter, scientists can not only solve the missing baryon problem but also gain insights into other cosmic phenomena, such as star formation, black holes, and the evolution of galaxies.
The study of FRBs represents a significant milestone in astronomical science. As research continues, the map of the universe becomes clearer, reshaping our understanding of its structure and history. Through these groundbreaking studies, the mysteries of the cosmos are slowly being unraveled, revealing a richly detailed tapestry of galactic evolution.