MegaCam Survey Working Group

MSWG mandate 2001 Feb. 28 Report MSWG composition

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MSWG mandate

    This working group will report to SAC, CFHT, and CEA, and will be funded for meetings by CFHT. The group will report to SAC as often as needed and at least at every SAC meeting. The group members are expected to serve until the first year of survey observing has been selected, unless there are reasons for early resignation.

    The group is expected to review all survey ideas that have been submitted from the CFH communities, and prepare a set of surveys that account for some 2/3 of the nominal 6 weeks per year of observing over 5 years - i.e. some 140 nights.

    The survey planning should lead to specific full survey proposals that will be reviewed by an independent survey TAC before the start of observations. While it expected that the surveys planned by the working group will form the main part of the survey time observations, they will be judged competitively with any other proposals that are submitted for annual review meetings.

    In planning the surveys, the working group should suggest ways to achieve different science goals within one survey. It is important to place these in context with other major surveys under way or planned. The group should consider optimum ways to perform surveys in terms of field size, regions of sky, time of year, image quality, lunar phase,  timing, exposure length, and filters.

   The working group is expected to advise on the overall calendar duration  and amount of observing time that will produce important scientific results, including deviations from the nominal 6 weeks for 5 years (e.g. more time for fewer years, uneven distribution over different years, etc). The group will also recommend filters, which require a long lead time for fabrication.

   The working group will advise on data handling, early release, and final data products. It is expected that members of the working group will be closely involved in executing the surveys and in some of the scientific analysis. SAC, CFHT, and CEA have recommended that the final data products will be available to all members of the participating CFH communities, and should address the mechanisms of data access and quality control.

   The working group should also look for ways to leave sufficient dark galactic pole observing time for proposals submitted for non-survey time. This should include use of bright time (red or NB filters), and use of observing time other than the galactic pole seasons. The group should also address the pros and cons of conducting any or all the surveys in queue scheduled mode.

2001 Feb. 28 Report to SAC

After a few iterations, two general meetings and a lot of email exchanges, the MSWG issued its first full report to SAC and released it to the community on Feb. 28, 2001. While this report is not the final word on what the MSWG calls the "Canada France Hawaii Legacy Survey" (CFHLS), it is an overview of what the MSWG considers as an exciting set of observations to be done and offered to the three communities.

A postscript version of this report is available here in postcript and here in pdf.

Regional meetings are being organized in Canada, France and Hawaii, where MSWG members will expose the rationale of the CFHLS and receive comments and input for the next version of the report which will be issued prior to the CFHT Users' meeting (Lyon, France, May 31 and June 1, 2001).

MSWG composition

Alain Blanchard (OMP - France)
Ray Carlberg (U. Toronto - Canada)
JJ Kavelaars (McMaster U. - Canada)
Olivier LeFevre (LAS - France)
Yannick Mellier (IAP - France)
Annie Robin (Obs. Besancon - France)
David Schade (HIA - Canada)
Laurent Vigroux (CEA)
Christian Veillet (CFHT) - chair
Richard Wainscoat (UH - Hawaii)

Mailing list:

Christian Veillet <>, Laurent Vigroux <>,
Olivier LeFevre <>, Annie Robin <>,
Richard Wainscoat <rjw@IfA.Hawaii.Edu>, JJ Kavelaars <>,
Alain Blanchard <>, Ray Carlberg <>,
David Schade <>, Yannick Mellier <>