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 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.
- In 'For the Public' you can learn about the secrets of the Universe COSMOS hopes to unravel, the different telescopes used for COSMOS surveys, explore some of the images and meet our team Artist-in-Residence.
- 'For Astronomers' provides astronomers with data access, a comprehensive summary of all available data products, a list of team members and other useful tools.
- 'For Reviewers' gives a 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
The James Clerk Maxwell Telescope, now owned and operated by the East Asian Core Observatories Association (EACOA) has recently announced its large legacy programs it will embark on between the end of 2015 to January of 2019, dedicating half of the observatory's time and resources through several collaborative large projects. Two of these projects focus on observations of the COSMOS field.
The first is the S2-COSMOS survey, a 223 hour program seeking to complete deep 850um mapping of the entire 2 square degree field. This will enable the direct detection of ~1000 submillimeter galaxies down to a flux limit of ~4.5mJy (4 sigma). The S2-COSMOS survey is being coordinated by Ran Wang, Scott Chapman, Yuichi Matsuda, Yujin Yang, Ian Smail, and Wei-Hao Wang.
The second survey focused on COSMOS is the STUDIES survey, or the SCUBA-2 Ultra Deep Imaging EAO Survey. This is a 330 hour deep pointing focusing on the high angular resolution capability of 450um imaging in superb weather. The goal of STUDIES is to detect typical galaxies in their dust emission in the early Universe and understand the full origins of the far-IR extragalactic background light. STUDIES will achieve a 0.57mJy RMS map at 450um (confusion-limited) in the CANDELS-imaged portion of COSMOS, already covered by HST with a substantial amount of multiwavelength data and spectroscopy. This will be the deepest submillimeter map ever taken at 450um. This project is being coordinated by Scott Chapman, Xianzhong Zheng, Hyunjin Shim, Tadayuki Kodama, Ian Smail and Wei-Hao Wang (PI).
COSMOS team members who are an EAO member partner or in an EAO region (China, Japan, Korea, Taiwan, or select universities in the UK or Canada) are encouraged to participate in the JCMT legacy programs. This is great news for COSMOS, and will certainly establish the field as the leading submillimeter extragalactic survey field for years to come.
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. Read the full press release here.
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 Hubble 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.
The COSMOS Artist-in-Residence, Karel Nel, has recently exhibited his new works in London. The exhibition, named 'Observe', was partly inspired by results presented at the June 2015 COSMOS Team Meeting in Helsinki. The brochure can be found here and more information on Karel's involvement in COSMOS here.