The team found typical galaxies forming stars in the Universe 2 billion years after the Big Bang have only twenty percent of metals (elements heavier than Helium) compared with those in the present day Universe. They also discovered the metal content is independent of the strength of the star-formation activity – in stark contrast with what is known for recently formed, or nearby galaxies (Figure 2).
- The W. M. Keck Observatory operates the two, 10-meter optical/infrared telescopes near the summit of Maunakea on the Island of Hawaiʻi, neighboring the Subaru Telescope.
- MOSFIRE (Multi-Object Spectrograph for Infrared Exploration) is a highly efficient instrument that can take images or up to 46 simultaneous spectra. A sensitive state-of-the-art detector and electronics system enables MOSFIRE to obtain observations of very faint objects.
- M. Onodera: Institute for Astronomy, ETH Zürich, Switzerland and Subaru Telescope, USA
- C. M. Carollo: Institute for Astronomy, ETH Zürich, Switzerland
- S. Lilly: Institute for Astronomy, ETH Zürich, Switzerland
- A. Renzini: INAF-Osservatorio Astronomico di Padova, Italy
- N. Arimoto: Subaru Telescope, USA and SOKENDAI, Graduate University for Advanced Studies, Japan
- P. Capak: Infrared Processing and Analysis Center (IPAC), USA and California Institute of Technology, USA
- E. Daddi: CEA, Laboratoire AIM-CNRS-Universite Paris Diderot, France
- N. Scoville: California Institute of Technology, USA
- S. Tacchella: Institute for Astronomy, ETH Zürich, Switzerland
- S. Tatehora: SOKENDAI, Graduate University for Advanced Studies, Japan
- G. Zamorani: INAF-Osservatorio Astronomico di Bologna, Italy
- Preprint is available here.
- Press release from ETH Zürich is here.
- Press release from Keck Observatory is here.