Stephen Gwyn's CFHTLS pages

Introduction

This page presents stacked images and catalogues for the CFHTLS Deep and Wide Fields.

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."

There currently three versions of the Deep Fields:

The final version (2008B) was produced after the completion of the CFHTLS Deep survey. It contains all usuable data taken as part of the completed survey.
In addition, "best seeing" versions of the Deep fields have been produced (2008B.IQ). These images have final image qualities of 0.65 arcseonds. The selection of the best seeing is dicussed in detail here.

There is only one version of the Wide fields. Much of the Wide data are public, but some are proprietary and are only available to the Canadian and French astronomical communities, but some images are public.

Images and Catalogues

The following will give you links to the images and catalogues.

Deep 2008B images and catalogues (complete CFHTLS data)
Deep 2008B.IQ images and catalogues ("best seeing" CFHTLS data)
Wide images and catalogues (some proprietary)
Deep 2008A images and catalogues (obselete)

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.

The non-CFHTLS data available for the Deep Fields is listed on the following page:

Coverage at other wavelengths

Ancillary Information

Stacking procedure (Read this first)
Tables of input images and limiting magnitudes
Checks on Astrometry
Checks on Photometry
The CFHTLS ugriz filter set

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)

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