“HD1 would represent a giant baby in the delivery room of the early universe,” says Avi Loeb an astronomer at the Center for Astrophysics and co-author on the MNRAS study. “It breaks the highest quasar redshift on record by almost a factor of two, a remarkable feat.”
HD1 was discovered after more than 1,200 hours of observing time with the Subaru Telescope, VISTA Telescope, UK Infrared Telescope, and Spitzer Space Telescope.
“It was very hard work to find HD1 out of more than 700,000 objects,” says Yuichi Harikane, an astronomer at the University of Tokyo who discovered the galaxy. “HD1’s red color matched the expected characteristics of a galaxy 13.5 billion light-years away surprisingly well, giving me a little bit of goosebumps when I found it.”
The team then conducted follow-up observations using the Atacama Large Millimeter/submillimeter Array (arXiv:2112.09141
“Are the Newly-Discovered z∼13 Drop-out Sources Starburst Galaxies or Quasars?” by Fabio Pacucci, Pratika Dayal, Yuichi Harikane, Akio K. Inoue and Abraham Loeb, 7 April 2022, .
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