Author Archives: hjmccracken

Master-2 internship 2019: Measuring cosmic magnification in the Euclid deep fields

By | October 14, 2018

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 »

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 »

Thesis project: finding the highest redshift galaxies and galaxy clusters

By | February 8, 2018

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 »

Introducing the CALET project

By | January 23, 2018

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 »