Spectra for Quasars Pinpoint the Birth of Light
Using the spectra from distant quasars taken by a 10-m telescope at
W.M. Keck Observatory atop Mauna Kea, Hawaii, two teams of astronomers have suggested that the so-called cosmic Dark Ages came to an end approximately 900 million years after the big bang. The Dark Ages refer to a time in the history of the universe in which atomic hydrogen, formed from free electrons and protons approximately 300,000 years after the big bang, absorbed all light from the newly forming protogalaxies. Over time, ultraviolet light reionized the atomic hydrogen and allowed light to travel freely.
One team, representing 18 institutions from the US, Hungary and Japan, looked at changes in absorption in the spectra from four quasars at redshifts of up to 6.28. The other, which included researchers from
California Institute of Technology and the
Jet Propulsion Laboratory in Pasadena, examined absorption for a quasar at a redshift of 5.73. Both teams report that the spectra suggest that the reionization epoch began at a redshift of approximately 6.
LATEST NEWS
- Exail Signs LLNL Contract, Partners with Eelume
Apr 26, 2024
- Menlo Moves U.S. HQ: Week in Brief: 4/26/2024
Apr 26, 2024
- Optofluidics Platform Keys Label-, Amplification-Free Rapid Diagnostic Tool
Apr 25, 2024
- DUV Lasers Made with Nonlinear Crystals Enhance Lithography Performance
Apr 25, 2024
- Teledyne e2v, Airy3D Collaborate on 3D Vision Solutions
Apr 24, 2024
- One-Step Hologram Generation Speeds 3D Display Creation
Apr 24, 2024
- Innovation Award Winners for Laser Technology Honored in Aachen
Apr 23, 2024
- Intech 2024: AI Arrives on the Shop Floor
Apr 22, 2024