Astronomers participated in vast expanses and observed what they think is the farthest (and oldest) galaxy seen.
The galaxy GN-z11 may not have a catchy name, but it does reveal the farthest and oldest galaxy ever found, scientists have found. Astronomers, led by Nobuneri Kashikawa, a professor in the Department of Astronomy at the University of Tokyo, embarked on a mission to find the farthest observable galaxy of the universe, and to learn how and when it formed.
“From previous studies, the galaxy GN-z11 appears to be the farthest detectable galaxy from us, at 13.4 billion light-years or 134 non-billion kilometers (which is 134 after 30 zeros),” Kashikawa Said in a statement. “But measuring and verifying such distances is not an easy task.”
Image: Returning to the Big Bang and the Early Universe
To determine how far GN-Z11 is here on planet Earth, Kashikawa’s team studied the galaxy’s redshift – how much of its light has spread, or shifted toward the red end of the spectrum. In general, the farther away from the earth a cosmic object is, the more red its light will be.
Additionally, the team observed GN-Z11’s emission lines – observable, chemical signatures in light coming from cosmic objects.
By closely studying these signatures, the team was able to find out how far the light coming from the GN-z11 would have given us, giving them the tools to estimate its total distance from Earth.
“We looked at ultraviolet light in particular, because it is the region of the electromagnetic spectrum, which we expected to find red-colored chemical signals,” Kashikawa said. “The Hubble Space Telescope detected signatures multiple times in the GN-z11 spectrum.”
“However,” he said, “even Hubble cannot resolve ultraviolet emission lines to the degree we require. So we can use a more up-to-date ground-based spectrograph, measuring the emission lines Became an instrument called MOSFIRE, that is. Mounted for the Keek I telescope in Hawaii. “
Using MOSFIRE, the team was able to observe and study the emission lines coming from the Milky Way in detail. If other observations confirm the new findings, the GN-Z11 will officially rule as the farthest galaxy ever seen.
New study Posted on 14 December In the journal Nature Astronomy.
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