The “Dark Energy Survey”, an international scientific cooperation involving several centers in Spain, provides a large amount of open astronomical data and images, which is one of the largest amounts of data published so far.
This Dark Energy Survey (DES) Launched DR2, which is the second image and object catalog release in the seven-year history of the project. It is the final result of more than ten years of astronomical data collection and analysis. Its ultimate goal is to understand Accelerate the expansion of the universe And phenomenon Dark energy.
It is one of the largest astronomical catalogues published so far and is also publicly available.It was introduced at the annual (virtual) conference this week American Astronomical Society.
DR2 contains a catalog of nearly 700 million astronomical objects, thus expanding the 400 million catalog in the previous publication (DR1). In addition, he also improved it by perfecting the calibration technology. With the help of deeper DR2 combined images, the amount and distribution of matter in the universe can be better estimated.
Researchers all over the world can access these unprecedented data and extract them to make new discoveries about the universe, which is a supplement to the ongoing research of the Dark Energy Survey Cooperative.Complete data release usable online And open to the public to explore and gain their own insights.
In Spain, since 2006, several research groups have carried out work in various areas of the project: instrumentation, operation, data reduction and analysis software development. Energy, Environment and Technology Research Center (CIEMAT), Space Science Institute (IEEC-CSIC), Institute of High Energy Physics (IFAE) And the Institute of Theoretical Physics (International Finance College, UAM-CSIC).
There are stars on the elliptical galaxy NGC 474. / DES / NOIRLab / NSF / AURA
The statement said: “These catalogs and images are very rich in analysis of a variety of celestial bodies in our galaxy and other regions. In addition, in the past few months, they have been rigorously reviewed and verified to provide the scientific community with high-quality data.” Aurelio Carnero Rosell, CIEMAT researchers, is also one of the main researchers in this study.
Ignacio Sevilla NoarbeAnother co-author of DES added: “DES Data Release 2 is performed through various interfaces, including access to the catalog by querying the database and an aerial interactive browser, as well as online documents about all its contents. Ingredients”.
Dark Energy Survey: Accurate Mapping of the Universe
The dark energy survey aims to map hundreds of millions of galaxies and discover thousands of supernovae to measure the history of the expansion of the universe and the growth of large-scale structures in the universe, both of which reflect the amount of energy in the universe and the amount of nature and darkness . DES produced Larger dark matter map As well as the weak gravitational lensing and precise accuracy of the galaxy so far, as well as a new three times the size of the map, these maps will be released in the near future.
Other achievements include the establishment of a A catalog of pulsating stars called RR Lyra, Which can enable scientists to understand the outer space area beyond the edge of the Milky Way. In this region where there are almost no stars, the movement of RR Lyra implies the existence of stars. Huge invisible dark matter halo, This may provide clues to the formation of our Milky Way in the past 12 billion years.
In another result, the scientists in this collaboration used an extensive catalog of DR2 galaxies and data from the LIGO experiment to estimate the location of the merger between the two black holes, independent of other technologies, Infer the value of the Hubble constant, This is the key cosmological parameter.
By combining their data with other research, they can also generate a A complete map of the dwarf galaxy satellites of the Milky Way, Allowing researchers to understand How our own galaxy was formed And how to compare with the predictions of cosmologists.
The dark energy survey covers 5,000 square degrees of the southern sky (one-eighth of the entire sky), reaching a distance of billions of light years. In addition to pointing out the data collected, many other surveys are allowed. Dark energyIt covers a wide range of cosmic distances, from discovering new celestial bodies in the near solar system to investigating the properties of the first star-forming galaxies in the early universe.
The irregular dwarf galaxy, called IC 1613, contains about 100 million stars (blue in this picture). / DES / NOIRLab / NSF / AURA
DES is a collaboration of more than 400 scientists from 26 institutions in seven countries/regions.His main instrument Dark energy camera570 megapixels are installed on the 4-meter-long Blanco telescope, which is located in Cerro Tololo Del National Optical Observatory Chile Your data will be processed at the National Supercomputing Application Center in Illinois, USA.
The director of DES pointed out that accurate cosmological results based on the complete DES data set will be released within the next two years, but the results presented this week represent a “major milestone.” Rich Krone, Fermilab and University of Chicago.
He added: “For six years, this collaboration has taken pictures of distant celestial bodies in the night sky. Now, after carefully verifying the quality and calibration of the images taken by the Dark Energy Camera, we release the second batch of data and invite For professional and amateur scientists Investigate in-depth treasures that we think have not yet been discovered”.