Astronomers Discover Ancient "Loktak Protocluster" from 12.6 Billion Years Ago
A Cosmic Structure Named for India's Iconic Floating Lake
An international team of astrophysicists, led by Ronaldo Laishram of the University of Tokyo, has identified a massive protocluster of galaxies dating back 12.6 billion years. The newly discovered structure has been named the "Loktak Protocluster" after Loktak Lake in Manipur, India—a region famous for its unique floating islands called phumdis.
The Discovery
The structure consists of four distinct concentrations of linked galaxies, observed using the Subaru Telescope and the James Webb Space Telescope.
Notably, galaxies within the protocluster are physically larger than similar galaxies found in less dense regions, despite comparable star formation rates. This finding challenges older models where early galaxy evolution was thought to depend primarily on internal properties.
Why the Name Matters
Laishram, originally from Khangabok, Manipur, explained his inspiration:
"The protocluster's structure reminded me of the interconnected floating islands of Loktak Lake."
He added that naming the structure after Manipur was a way to place his home region in the context of the universe.
Implications for Galaxy Evolution
The discovery suggests that the surrounding cosmic environment influences galaxy growth much earlier than previously assumed. This challenges existing theories about how galaxies evolved in the early universe.
The research was published in The Astrophysical Journal Letters, and further study of other protoclusters is now needed to determine if this environmental effect is universal.
In Brief
- Led by: Ronaldo Laishram (University of Tokyo)
- Age of structure: 12.6 billion years
- Name: Loktak Protocluster
- Key finding: Larger galaxy sizes in dense environments, despite similar star formation rates
- Broader implication: Early galaxy evolution is shaped by cosmic environment