Current spotlights

July 12, 2019 • Current spotlights

New COSMOS Publication on Brightest Cluster Galaxy Progenitors

The brightest and most massive galaxies in the universe, the Brightest Cluster Galaxies (BCGs), tell a unique story of galaxy evolution. Today, BCGs are quiescent ellipticals hosted in relaxed galaxy clusters, with pasts fraught with mergers and high star formation rates (SFRs).

In a recent publication, Cooke et al. investigate how this active past may depend on local environment by estimating star formation in BCG progenitors in the COSMOS field out to a redshift of z ~ 3 (more than 11 billion years in the past).

June 30, 2019 • Current spotlights

Looking deep with the Hyper Suprime-Cam

March 15, 2019 • Current spotlights

Registration for 2019 COSMOS Team meeting is open!

Logo for 2019 COSMOS team meeting

We are pleased to announce the details of the 2019 COSMOS Team meeting in New York City 14-17 May 2019.

Please visit the meeting website here to register:

The registration + abstract deadline is April 15.  Thanks to the generous support of the Center for Computational Astrophysics at the Flatiron Institute, there will be no upfront registration cost for the meeting.

We look forward to seeing you in New York in a couple short months!

January 31, 2019 • Current spotlights

COSMOS Leadership Change



The Cosmic Evolution Survey (COSMOS) has officially changed hands this week, the second major leadership hand-off since the survey began in 2003. Caitlin Casey, Jeyhan Kartaltepe, and Vernesa Smolčić have taken over as the project's leaders as the collaboration enters its fifteenth year.

Peter Capak has led the COSMOS team for the past nine years with the help of Simon Lilly. "Since taking over leadership of COSMOS in 2010 we have replaced almost every data set we started with including major programs on Chandra, J-VLA, Keck, Spitzer, Subaru, and the VLT,” Capak shared. “In the coming years COSMOS science will likely center around observations with ALMA, J-VLA, and JWST. Casey, Kartaltepe and Smolčić are ideally placed to lead the science in these areas."

Capak is stepping aside due to his significant rolls in future space missions, including Euclid, WFIRST, and SPHEREx. Nick Scoville, the founder and first leader of COSMOS, handed over the reins to Capak in 2010.

April 3, 2018 • Current spotlights

COSMOS in the public eye

On 24-28th March 2018 the International Astronomical Union (IAU) held its huge Communicating Astronomy with the Public (CAP2018) conference in Fukuoka, Japan. COSMOS was represented at the meeting by team member Jacinta Delhaize from the University of Zagreb, who gave a talk on the various public outreach and communications initiatives of COSMOS.

She spoke about the various successes and challenges of engaging the public in such a large multi-national, multi-wavelength astronomical consortium. This is important because we think our data and science is great and we want to share it with everyone! The main challenge is that our astronomers, therefore the members of the public who we are trying to reach, are dispersed throughout the world over many different time zones and languages.

Therefore we mainly communicate our science using online platforms. We have this website and a presence on Facebook, Twitter and You Tube. We use these platforms to share our video blogs, news, press releases and more.

Stepping away from the virtual realm, we have our wonderful Artist-in-Residence Karel Nel, who creates renowned artworks inspired by COSMOS research. We also sometimes run public Astronomy on Tap events at the pub alongside our annual team meetings.

If you have any feedback or suggestions about other initiatives or website content you'd like to see, please let us know!

March 29, 2018 • Current spotlights

Our 10K DEIMOS spectroscopic catalog is out!

The DEIMOS 10K spectroscopic catalog contains 10718 object out to z = 6 in the COSMOS field observed through multi-slit spectroscopy with the Deep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II telescope. The objects have been selected from a variety of input catalogs based on multi-wavelength observations in the field, and thus have a diverse selection function, which enables the study of the diversity in the galaxy population.

For more information, check out the data release paper.
The redshift catalog is public and can be downloaded here.


March 15, 2018 • Current spotlights

Registration for the COSMOS meeting 2018 is now open!

We are pleased to announce the COSMOS annual meeting will be held Thursday June 28th to Saturday June 30th in Copenhagen Denmark in the Auditorium of the Geological Museum.  Registration is now open and both COSMOS and non-COSMOS members are welcome to attend!  
Registration and other information: