When did astronomers at the University of Tokyo report finding HD1?
Astronomers at the University of Tokyo reported finding HD1 on the 7th of April 2022. They located this object in the Sextans constellation using data from the Subaru Telescope.
Astronomers at the University of Tokyo reported finding HD1 on the 7th of April 2022. They located this object in the Sextans constellation using data from the Subaru Telescope.
The light from HD1 traveled for 13.5 billion years before reaching Earth. Due to the expansion of space, the current proper distance is roughly 33.288 billion light-years.
One theory suggests it is an extreme starburst galaxy producing stars at a rate far higher than any previously observed. Another possibility involves a significant population of Population III stars that are massive and luminous or a quasar hosting a supermassive black hole.
New spectroscopic studies released in 2024 reclassified HD1 as a passive galaxy with a lower redshift value of z = 4.0. This finding contradicts the initial classification of a high-redshift galaxy near the edge of the observable universe which originally placed the object at approximately z = 13.27.
Researchers plan to use the James Webb Space Telescope to verify the true identity of HD1. They also intend to utilize the Nancy Grace Roman Space Telescope and GREX-PLUS space missions for further study.