The Cosmological Evolution Survey (COSMOS) is an astronomical survey designed to probe the formation and evolution of galaxies as a function of both cosmic time (redshift) and the local galaxy environment. The survey covers a 2 square degree equatorial field with imaging by most of the major space-based telescopes (Hubble, Spitzer, GALEX, XMM, Chandra, Herschel, NuStar) and a number of large ground based telescopes (Keck, Subaru, Very Large Array (VLA) , European Southern Observatory Very Large Telescope (ESO-VLT), United Kingdom Infrared Telescope (UKIRT), The National Optical Astronomical Observatory (NOAO) Badde and Blanco telescopes, the Canada France Hawaii Telescope (CFHT), and others) with many ongoing surveys. Over 2 million galaxies are detected, spanning 75% of the age of the Universe. The COSMOS survey involves more than 100 scientists in a dozen countries.
- In 'For the Public' you can learn about the different telescopes that have collected data in the COSMOS field, some of the scientific questions about the Universe that we are trying to answer, have a look at some of the images with the COSMOS SkyWalker and meet our team Artist-in-Residence Karel Nel.
- 'For Astronomers' provides astronomers and students with links to the COSMOS databases, a comprehensive summary of all data available at each wavelength, a list of team members and access to the enhanced data products such as photometric redshift, large scale structure and morphology catalogues, as well as an image cutout tool and the HELP initiative.
- 'For Reviewers' gives an detailed summary of the multiwavelength data available in COSMOS, suitable for an expert audience and reviewers.
- In 'Publications', 'News' and in the Spotlight below you can find out about some of the exciting scientific research that is being conducted by members of the COSMOS collaboration.
For website content comments or questions please contact Jacinta Delhaize - jacinta [at] phy.hr
ESO’s VISTA survey telescope has spied a horde of previously hidden massive galaxies that existed when the Universe was in its infancy. By discovering and studying more of these galaxies than ever before, astronomers have, for the first time, found out exactly when such monster galaxies first appeared.
Researchers have found that 'starburst' galaxies in the Universe 9 billion years ago were more efficient at forming stars than average galaxies today.
'Starburst' galaxies display unusually huge bursts of newly-formed stars and are likely caused by a collision between two large galaxies. A new study published in Astrophysical Journal letters on October 15, led by John Silverman at the Kavli Institute for the Physics and Mathematics of the Universe, has helped to understand exactly why such huge bursts of star formation occur. The researchers used the new, sensitive Atacama Large Millimeter Array (ALMA) in Chile to study carbon monoxide (CO) gas in seven starburst galaxies that existed when the Universe was only four billion years old. They found that the amount of CO gas in these galaxies is not special, but that these galaxies seem to be particularly efficient at turning their gas into stars. This study also relied on a variety of powerful telescopes available through the COSMOS survey, including the Spitzer Observatory, the Herschel Observatory and the Subaru Telescope.
This UV image from Herschel shows the result of two massive galaxies colliding. The blue contours show data from ALMA and reveal where bursts of star formation are occuring within dust clouds.