Press Release: Oldest Galaxy Protocluster forms “Queen’s Court”

Recently, using the Subaru, Keck, and Gemini Telescopes, we discovered a collection of 12 galaxies in the constellation Cetus which existed about 13.0 billion years ago. This is the earliest protocluster ever found. One of the 12 galaxies is a giant object, known as Himiko, which was discovered a decade ago by the Subaru Telescope and named for a legendary queen in ancient Japan. This discovery suggests that large structures such as protoclusters already existed when the Universe was only about 800 million years old, 6 percent of its present age. Read the full press release in English from NAOJ here and in Portuguese from ON here. A preprint of the paper by Harikane et al. can be found here.