The MegaPipe image stacking pipeline
The MegaPipe image stacking pipeline CFHTLS: 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.
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 arcseconds. The selection of the best seeing images is discussed in detail on the best seeing image selection page. There is only one version of the Wide fields.
You can download the CFHTLS data by following these links:
- Deep Field images and catalogues The best seeing version is denoted by "IQ" in the observationID.
- Wide Field images and catalogues
Alternatively, you can browse the CFHTLS and retrieve images and catalogs using a Google Maps type interface. This interface also includes all MegaCam data, as well as all data processed with MegaPipe.
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). If you do not wish to download the entire CFHTLS catalog, you may wish to use the catalog query service.
The CFHTLS Deep Fields were observed repeatedly over 5 years. Two data products are available to exploit the temporal coverage. Images were produced which combine all the data from a single queue run (spaced approximately every month). Photometric time series were generated which give the magnitude of the point source in the Deep Fields in every exposure.
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 2012
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