Category Archives: Surveys

Introducing COSMOS2020

By | October 28, 2021

Today we publicly release COSMOS2020, a catalogue of almost a million sources with photometric redshifts and stellar masses in the COSMOS field. COSMOS2020 is described fully in this paper, which has been accepted for publication in the Astrophysical Journal. We are also providing a python notebook showing how to use the catalogues. Released around five… Read More »

A first look at the Spitzer Legacy Survey for Euclid

By | November 27, 2019

By combining mid-infrared light with optical and near-infrared observations one can find the most distant objects in the Universe, right back to the start of cosmic time. That is because the expansion of the Universe causes the light emitted by receding objects to be shifted towards the red. For the most distant objects, only the… Read More »

Final CFHTLS TERAPIX dataset available at CALET

By | October 4, 2018

The Canada-France-Hawaii Telescope Legacy survey, or CFHTLS, was a wide-field survey sky-survey carried out using the Megacam camera on CFHT. CFHTLS had two components: a “wide” and “deep” survey. The deep survey comprised four deep fields observed in ugriz bands and the wide survey was a shallower survey covering around 140 square degrees in five… Read More »

Processing the fourth UltraVISTA data release: a status report

By | June 28, 2018

UltraVISTA is a deep near-infrared survey on the COSMOS field, and this article describes work underway at CALET to process the fourth UltraVISTA data release, DR4. DR4 is on-track to be publicly released world-wide at the end of 2018 via the ESO archive centre. Some background The UltraVISTA survey started in 2009 as one of… Read More »