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!
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Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
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An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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