Using gravity from a foreground galaxy as a zoom lens the team was able to see a young star-forming galaxy in the distant Universe as it appeared only two billion years after the Big Bang.
Scientists at Durham University (including Royal Astronomical Society Norman Lockyer Fellow Dr Mark Swinbank), Cardiff University and the California Institute of Technology (Caltech, USA), are behind the research, partly funded by the Royal Astronomical Society and published today (Thursday 9th October) in the prestigious scientific journal Nature.
The researchers, led by Dr Dan Stark, of Caltech, say their findings show for the first time how the distant galaxy might evolve to become a present-day system like our Milky Way.
And they say their study also provides a taste of what astronomers will be able to see in the distant Universe once projects such as the planned European Extremely Large Telescope (E -ELT) and the American Thirty Metre Telescope (TMT) come into use.
The Cosmic Eye is so called because the foreground galaxy, which is 2.2 billion light years from Earth, appears in the centre of an arc created by the distant galaxy – giving it the appearance of a human eye.
The distant galaxy, which lies 11 billion light years from Earth, was originally identified using the Hubble Space Telescope.
The team then used the ten metre Keck telescope, on Hawaii, which is equipped with laser -assisted guide star adaptive optics (AO) to correct for blurring in the Earth’s atmosphere, to carry out their observations.
By coupling the telescope with the magnifying effect of the gravitational field of the foreground galaxy – a technique called gravitational lensing - they were able to study the distant star system.
Gravitational lensing, the distortion of light rays by massive objects as predicted by Einstein, enlarged the distant galaxy by eight times.
This allowed the scientists to determine the galaxy’s internal velocity structure and compare it to later star systems such as the Milky Way.
Dr Swinbank, of The Institute for Computational Cosmology, at Durham University, said: “This is the most detailed study there has been of an early galaxy. Effectively we are looking back in time to when the Universe was in its very early stages.
“This technique of using gravitational lensing provides us with a glimpse of what we will commonly achieve when the next generation of telescopes, which are still a decade away, come on-line.”
Dr Dan Stark, of Caltech, said: “Gravity has effectively provided us with an additional zoom lens, enabling us to study this distant galaxy on scales approaching only a few hundred light years.
“This is ten times finer sampling than previously. As a result for the first time we can see that a typical-sized young galaxy is spinning and slowly evolving into a spiral galaxy much like our own Milky Way.”
Data from the Keck Observatory was combined with millimetre observations from the Plateau de Bure Interferometer, in the French Alps, which is sensitive to the distribution of cold gas destined to collapse to form stars.
Dr Swinbank added: “Remarkably the cold gas traced by our millimetre observations shares the rotation shown by the young stars in the Keck observations.
“The distribution of gas seen with our amazing resolution indicates we are witnessing the gradual build up of a spiral disk with a central nuclear component.”
The research was funded by a variety of bodies including the RAS, the Science and Technology Facilities Council (STFC), the Royal Society, the National Science Foundation (NSF) and the Keck Foundation.
Data for the research was obtained at the WM Keck Observatory, which is operated as a scientific partnership between Caltech and NASA and from observations made with European Organisation for Astronomical Research in the Southern Hemisphere (ESO) Telescopes at the Paranal Observatory.
The scientists say the research demonstrates how important angular resolution - the angular size of the smallest detail of an astronomical object that can be distinguished with a telescope - has become in ensuring progress in extragalactic astronomy.
Projects such as the E-ELT, TMT and the Atacama Large Millimeter/submillimeter Array (ALMA), a large interferometer being completed in Chile, will aid this work.
(Adapted from a release from the University of Durham press office)
Robert Massey | alfa
Researchers discover link between magnetic field strength and temperature
21.08.2018 | American Institute of Physics
Smallest transistor worldwide switches current with a single atom in solid electrolyte
17.08.2018 | Karlsruher Institut für Technologie (KIT)
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Power and Electrical Engineering
21.08.2018 | Life Sciences
21.08.2018 | Medical Engineering