General introduction: HSC collaboration meeting at Princeton Yasushi Suto Department of Physics, The University of Tokyo (Global Scholar, Dept. of Astrophys. Sci., Princeton Univ.) HSC collaboration Nov. 11 & 12, 2009

Proposed agenda: Wed., Nov :00-14:30 Yasushi Suto: HSC organization: advisory council, survey design committee, working group Summary of discussion on Sept. 25 at University of Tokyo Purpose of this meeting 14:30-15:00 discussion 15:00-16:00 current plan of 3 surveys 10 min presentations by chairs of each survey + 10 min discussion 16:00-16:30 coffee 16:30-18:00 discussion led by Masahiro Takada on collaboration policy, etc.

Proposed agenda: Thu., Nov.12 9:00-12:00 parallel session on how to optimize the current survey plan Wide survey (chair: Masahiro Takada) Deep survey (chair: Tomoki Morokuma) Ultra-deep survey (chair: Masami Ouchi) 13:30-15:30 summary of the morning session and discussion 13:30-14:10 Masahiro Takada: wide-survey 14:10-14:50 Tomoki Morokuma: deep survey 14:50-15:30 Masami Ouchi: ultra-deep survey 15:30-16:00 coffee 16:00-18:00 further discussion toward the proposal led by Michael Strauss

Outline of this collaboration meeting Establish the HSC organization advisory council, survey design committee, working group How to proceed Summary of discussion on Sept. 25 at The University of Tokyo Survey designs Collaboration policy Data right

We have to avoid this kind of fight among HSC collaborators

A possible HSC organization proposed on Jan. 19, 2009 at NAOJ HSC Survey Design Committee Working group 1 Working group 2 Working group 3 Working group N …… HSC collaborators PI Advisers H.Karoji S.Miyazaki M.Takada: weak lens K.Shimasaku: high-z objects M.Chiba: Galactic archeology J.Gunn: galaxy evolution M.Strauss: everything scientific D.Spergel, T.Yamada, N.Yasuda, … non-scientific E.Turner, Y.Suto, … N-PAC council

Today’s proposal (for HSC, not for SUMIRE) HSC Survey Design Committee Working group 1 Working group 2 Working group 3 Working group N …… HSC collaborators PI Advisory Council H.Karoji S.Miyazaki M.Chiba, J.Gunn, K.Shimasaku, M.Strauss, M.Takada, K.Umetsu H.Aihara, P.Ho, H.Murayama, D.Spergel, Y.Suto, E.Turner N-PAC council

How to proceed next ? (Jan version) Aug. 2010: deadline of the Subaru strategic program proposal Jun. 2010: HSC proposal 1 st draft completed and circulated among collaborators Mar. 2010: Japan-Princeton-Taiwan HSC Japan ? Dec. 2009: draft of HSC survey circulated among collaborators Nov. 2009: HSC Princeton Mar. 2009: 3rd HSC workshop (in NAOJ or Univ. of Tokyo

How to proceed next ? Dec. 2013: 1 st world-top result from HSC as part of SUMIRE project XXX.2012: start HSC survey Aug. 2011: deadline of the Subaru strategic program proposal XXX. 2011: HSC proposal 1 st draft completed and circulated among collaborators XXX.2010: Japan-Princeton-Taiwan HSC Japan ? Nov. 2009: HSC Princeton

Summary of discussion on Sept. 25 at The University of Tokyo According to the draft of HSC white paper, the number of requested nights of wide, deep and ultra- deep surveys is 600. Somehow we have to reduce it by 50% (?) It is non trivial at al. Possibilities include Cut each of these surveys by a factor of two. Drop one (or even two !) of the survey plans, and adjust the number of nights among the rest of the plans Something in-between the above two, by cutting each of the surveys by a factor depending on the strength of their scientific case. The factors may be adapted after a few years of the survey, depending on its achievements.

Purpose of today ’ s discussion The latest number of requested nights for each survey (wide, deep, and ultra-deep) Presentation by each survey group Agreement on the decision making procedure Discussion today and tomorrow Final decision; who and how ? other collaboration issues

Summary of requested nights Wide 1500 deg nights (w/o weather factor) 1000 deg nights Deep 79 nights (w/o weather factor) Ultra-deep 69 nights (w/o weather factor) Max number of nights: 210 (w/o weather factor) Ratio: ( )/210=307/210=1.46 On average, 210/307=0.68 reduction

Comparison: Nov.11 vs. Nov.12 Wide 1500 deg nights ⇒ 1000 deg nights Deep 79 nights ⇒ 43 nights Ultra-deep 69 nights ⇒ 60 nights Max number of nights: 210 (w/o weather factor) Wide: deep: ultra-deep = 50: 20: 30