Astronomers first identified galaxy EGS-zs8-1 based on its particular colors. They say it’s more than 13 billion years in the past—a time when the universe was only 5 percent of its present age.
“It has already built more than 15 percent of the mass of our own Milky Way today,” says Pascal Oesch, a Yale University astronomer and lead author of a study published online in Astrophysical Journal Letters. “But it had only 670 million years to do so. The universe was still very young then.”
Measuring The Distance
Oesch and colleagues determined its exact distance from Earth using the powerful MOSFIRE instrument on the W.M. Keck Observatory’s 10-meter telescope in Hawaii.
The new distance measurement also enabled the astronomers to determine that EGS-zs8-1 is still forming stars rapidly, about 80 times faster than our galaxy.
Only a handful of galaxies currently have accurate distances measured in this very early universe.
“Every confirmation adds another piece to the puzzle of how the first generations of galaxies formed in the early universe,” says Pieter van Dokkum, a professor and chair of Yale’s astronomy department, who is second author of the study. “Only the largest telescopes are powerful enough to reach to these large distances.”
The MOSFIRE instrument allows astronomers to efficiently study several galaxies at the same time. Measuring galaxies at extreme distances and characterizing their properties will be a major goal of astronomy over the next decade, the researchers says.
The new observations establish EGS-zs8-1 at a time when the universe was undergoing an important change: the hydrogen between galaxies was transitioning from a neutral state to an ionized state.
“It appears that the young stars in the early galaxies like EGS-zs8-1 were the main drivers for this transition, called reionization,” says Rychard Bouwens of the Leiden Observatory and coauthor of the study.
Taken together, the new Keck Observatory, Hubble, and Spitzer observations also pose new questions. They confirm that massive galaxies already existed early in the history of the universe, but they also show that those galaxies had very different physical properties from what is seen around us today.
Astronomers now have strong evidence that the peculiar colors of early galaxies—seen in the Spitzer images—originate from a rapid formation of massive, young stars, which interacted with the primordial gas in these galaxies.
The observations underscore the exciting discoveries that are possible when NASA’s James Webb Space Telescope is launched in 2018, note the researchers. In addition to pushing the cosmic frontier to even earlier times, the telescope will be able to dissect the galaxy light of EGS-zs8-1 seen with the Spitzer telescope and provide astronomers with more detailed insights into its gas properties.
“Our current observations indicate that it will be very easy to measure accurate distances to these distant galaxies in the future with the James Webb Space Telescope,” says study coauthor Garth Illingworth of the University of California-Santa Cruz. “The result of JWST’s upcoming measurements will provide a much more complete picture of the formation of galaxies at the cosmic dawn.”