Peering back in time more than 7 billion years, a team of astronomers using a powerful new spectrograph at the W. M. Keck Observatory in Hawaii has obtained the first maps showing the distribution of galaxies in the early universe. The maps show the clustering of galaxies into a variety of large-scale structures, including long filaments, empty voids, and dense groups and clusters.
These maps are among the first results from the DEEP2 Redshift Survey, an ongoing three-year project designed to study galaxies in the distant universe over a volume comparable to recent surveys of the local universe. Using the new DEIMOS (Deep Extragalactic Imaging Multi-Object Spectrograph) instrument at the 10-meter Keck II Telescope, this project is measuring the properties of distant galaxies as well as mapping out their distribution in space. DEIMOS, which was built precisely for this survey, allows simultaneous, detailed observations of up to 150 galaxies at a time. By studying galaxies whose light has taken billions of years to reach the Earth, the astronomers are effectively looking far back in time.
"For the first time, we are getting a map of the universe as it was 7 billion years ago, when it was roughly half the age it is now. Comparing these observations with local surveys will yield direct clues to some of the most profound mysteries of the universe, such as the nature of dark matter, the nature of dark energy, and the origins of galaxies and quasars," said David Koo, professor of astronomy and astrophysics at the University of California, Santa Cruz.
Tim Stephens | EurekAlert!
IceCube experiment finds Earth can block high-energy particles from nuclear reactions
24.11.2017 | Penn State
New proton record: Researchers measure magnetic moment with greatest possible precision
24.11.2017 | Johannes Gutenberg-Universität Mainz
High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons
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Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
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