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 meeting @Princeton, Nov. 11 & 12, 2009

Proposed agenda: Wed., Nov. 11

14:00-14:30 Yasushi Suto: HSC organization: advisory council , survey design commi

ttee, working group Summary of discussion on Sept. 25 at University of Toky

o 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 proposa

l 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 organizationproposed 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.KarojiS.Miyazaki

M.Takada: weak lensK.Shimasaku: high-z objectsM.Chiba: Galactic archeologyJ.Gunn: galaxy evolutionM.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.KarojiS.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. 2009 version)

Aug. 2010: deadline of the Subaru strategic program proposal

Jun. 2010: HSC proposal 1st draft completed and circulated among collaborators

Mar. 2010: Japan-Princeton-Taiwan HSC workshop @ Japan ?

Dec. 2009: draft of HSC survey circulated among collaborators

Nov. 2009: HSC workshop @ Princeton Mar. 2009: 3rd HSC workshop (in Japanese)

@ NAOJ or Univ. of Tokyo

How to proceed next ?

Dec. 2013: 1st 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 1st draft

completed and circulated among collaborators

XXX.2010: Japan-Princeton-Taiwan HSC workshop @ Japan ?

Nov. 2009: HSC workshop @ 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 deg2 159 nights (w/o weather factor) 1000 deg2

106 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: (159+79+69)/210=307/210=1.46 On average, 210/307=0.68 reduction

Comparison: Nov.11 vs. Nov.12

Wide 1500 deg2 159 nights ⇒ 1000 deg2

106 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