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 »
The UltraVISTA DR4 RC2 is being made available for internal testing by the UltraVISTA consortium. If no issues are found this data will be made public worldwide through the ESO phase 3 portal in the coming months. UltraVISTA is a deep survey of the COSMOS field using the VIRCAM camera on ESO’s VISTA telescope. DR4… Read More »
The objective of this internship is to make a measurement of the cosmic magnification effect in prototype Euclid deep field data. Background ESA’s Euclid satellite aims to uncover the nature of dark matter and dark energy by precisely measuring shapes and positions of a billion galaxies taken with the wide-field VIS camera. Dark matter induces… Read More »
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 »
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 »
This week (11-15 June 2018) we are attending the Euclid consortium meeting in Bonn. We will be explaining of course why the CALET project is important for a space-based observatories like Euclid!
So, what is the origin of cosmic structures? In particular, the walls, sheets and filaments composed of galaxies and galaxy clusters? Although the seeding of these structures by tiny fluctuations in the cosmic microwave background remains our dominant paradigm for galaxy formation, there are still — of course — unanswered questions. In particular, what role… Read More »
The CALET project is a collaboration to process, distribute and analyse ground and space-based imaging data in the Euclid calibration and deep fields. It builds on the foundation of the TERAPIX project (1997-2017), which was a national service to reduce data from wide-field cameras and in particular data from CFHT‘s MEGACAM camera. CALET aims to provide… Read More »