Giant Galaxy Hosts Most Distant Supermassive Black Hole 

Astronomers have discovered a giant galaxy surrounding the most distant supermassive black hole ever found.

Astronomers have discovered a giant galaxy so distant that it is seen as it was 12.8 billion years ago, is as large as the Milky Way galaxy and harbors a supermassive black hole that contains at least a billion times as much matter as our Sun.

University of Hawaii (UH) astronomer Tomotsugu Goto stated, “It is surprising that such a giant galaxy existed when the Universe was only one-sixteenth of its present age, and that it hosted a black hole one billion times more massive than the Sun. The galaxy and black hole must have formed very rapidly in the early Universe.”

Knowledge of the host galaxies of supermassive black holes is important in order to understand the long-standing mystery of how galaxies and black holes have evolved together. Until now, studying host galaxies in the distant Universe has been extremely difficult because the blinding bright light from the vicinity of the black hole makes it more difficult to see the already faint light from the host galaxy.

Unlike smaller black holes, which form when a large star dies, the origin of the supermassive black holes remains an unsolved problem. A currently favoured model requires several intermediate black holes to merge. The host galaxy discovered in this work provides a reservoir of such intermediate black holes. After forming, supermassive black holes often continue to grow because their gravity draws in matter from surrounding objects. The energy released in this process accounts for the bright light emitted from the region around the black holes.

To see the supermassive black hole, the team of scientists used new red-sensitive charge coupled devices (CCDs) installed in the Suprime-Cam camera on the Subaru telescope on Mauna Kea. Satoshi Miyazaki of the National Astronomical Observatory of Japan (NAOJ) is a lead investigator for the creation of the new CCDs and a collaborator on this project. He said, “The improved sensitivity of the new CCDs has brought an exciting discovery as its very first result.”

A careful analysis of the data revealed that 40 percent of the near-infrared light observed (at the wavelength of 9100 Angstroms) is from the host galaxy itself and 60 percent is from the surrounding clouds of material (nebulae) illuminated by the black hole.

Yousuke Utsumi (Graduate University for Advanced Studies /NAOJ), a member of the project team, said, “We have witnessed a supermassive black hole and its host galaxy forming together. This discovery has opened a new window for investigating galaxy-black hole co-evolution at the dawn of the Universe.”

Other members of the research team are Hisanori Furusawa (NAOJ) and Yutaka Komiyama (NAOJ). The research will be published in the online version of the journal Monthly Notices of the Royal Astronomical Society.