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
A research team, led by ETH Zurich researcher Benny Trakhtenbrot, has discovered a gigantic black hole that is much more massive than we expect it to be. Using data from Hubble, Chandra and the Keck Telescope in Hawaii, the team have found that the black hole has a mass that is 10% the mass of the 'normal sized' galaxy it sits in. This black hole exists in the very distant Universe at redshift 3.328, a mere 2 billion years after the Big Bang. As a comparison, in the nearby Universe most black holes have masses around 0.2 to 0.5% the mass of their host galaxies. So this monster black hole grew much quicker than was thought possible, and this may change our understanding of how black holes and galaxies form together. These results have recently been published in Science.
CONFIRMED: Galaxies contained far less dust in the early stages of their evolution!
Using ALMA, COSMOS team leader Peter Capak and collaborators picked up the signature of [CII] (emitted by gas) and continuum (emitted by dust) in nine 'normal' galaxies at redshift 5 to 6 - only 1 billion years after the Big Bang.
They had twelve times less dust than similar galaxies at a later stage of cosmic evolution, at redshift ~4.
This confirms suspicions that the interstellar medium of galaxies evolved significantly. Their results are very important for our understanding of galaxy evolution and have now been published in Nature.