The Cosmic 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 and a number of large ground based telescopes, 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.
COSMOS data across many different wavelengths, including X-ray, infrared and radio, has been used to set the record for the most distant galaxy cluster ever discovered. We may be seeing the cluster, named CL J1001+0220, just after it's formation and while it is in the process of a big 'baby-boom' of star formation. Full article
A composite image of the cluster CL J1001+0220 in X-ray, infrared and radio. Image credit - X-ray: NASA/CXC/Université Paris/T.Wang et al; Infrared: ESO/UltraVISTA; Radio: ESO/NAOJ/NRAO/ALMA
A further 1500h of Spitzer time has been awarded to complete a survey of the COSMOS field. The program has been approved in Spitzer Cycle-13 to PI I. Labbe and COSMOS Co-I Karina Caputi. This will complete the legacy of Spitzer/IRAC over COSMOS by extending the deep coverage to cover the full 1.8 sq degree field, producing a nearly homogenous and contiguous map unparalleled in terms of area and depth. This will complement ongoing optical-to-NIR surveys and reconfirm COSMOS as a unique field for probing the bright end of the z=6-11 universe and the formation of large-scale structures. Full article
Several hours of highly competitive Atacama Large Millimeter Array (ALMA) Cycle 4 time has been awarded to COSMOS astronomers to target various objects in the COSMOS field. ALMA is a revolutionary millimetre/sub-millimeter telescope and COSMOS astronomers will use it to gain a deeper understanding of how galaxies formed and evolved. They will study how the galaxy environment impacts star formation, examine the sizes and structures of enigmatic sub-millimetre galaxies, reveal the properties of galaxies in the high redshift Universe, and more. Congratulations to everyone involved! See the full article for details of the successful proposals. Full article