The MegaPipe CFHTLS pages

Introduction

These pages present stacked images and catalogues for the CFHTLS Deep and Wide Fields. It provides links to the data, information on how the images and catalogues were produced and quality control information on the data.

If you use this data in a publication, please include the following acknowledgment:

"Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS."

Also, please cite the following paper: Gwyn 2008

A paper describing the images and catalogues has been prepared. It has beeen submitted to the Astronomical Journal. It is available on astro-ph.

Images and Catalogues

The following will give you links to the images and catalogues for the Deep and Wide fields. There are two versions of the Deep Fields: The "full" version contains all usuable data taken as part of the completed survey. In addition, "best seeing" versions of the Deep fields have been produced These images have final image qualities of 0.65 arcseonds. The selection of the best seeing images is dicussed in detail here. There is only one version of the Wide fields.

Deep images and catalogues (full)
Deep IQ images and catalogues (best seeing)
Wide images and catalogues

Alternatively, you can browse the CFHTLS and retreive images, catalogs or image cutouts using a Google Maps type interface:

CFHTLS Graphical Search Tool

For the Deep fields only, you can view the sky at a number of different wavelengths from X-ray to Radio, again using a Google Maps interface.

Unified catalogues have been produced for the CFHTLS. Each catalogue covers an entire survey (Deep or Wide).

Unified catalogs

If you do not wish to download the entire CFHTLS catalog, you may wish to use the catalog query service:

Catalog queries

Ancillary Information

These data were generated by Stephen Gwyn of the University of Victoria and the Canadian Astronomical Data Centre. The first version of these images was produced and released shortly after the first Elixir-processed images became available from CFHT in early 2003. It became public 30 June 2006. Since then, new public version have been generated semi-annually. The previous public releases were:

30 June 2006
1 January 2007 (2007A)
1 September 2007 (2007B)
1 February 2008 (2008A)

All these versions are superseded by the current version.

Send comments/suggestions/problems to:
Stephen.Gwyn@nrc.ca