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MGCT2Arizona Inn, Tucson

Leonidas Moustakas, JPL/Caltech1 November 2006

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The most critical question of our meeting?

Will there be need for a third “MGCT” workshop in two years?!

(And if so, where?)

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The matter with galaxies• WMAP: b = 0.047

• 2dF, etc: stars= 0.0022

• So the material content of our workshop encompasses less than 0.2% of the mass-energy budget of the Universe.

Most of this mass in stars today lives in a relatively small fraction of galaxies, with

old stars…

When did they form, or assemble?

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Our stars1: Early-type galaxies

The default maxim has been…:

All high-redshift galaxies are progenitors of present-day

massive early-type galaxies…

But the view is more complex now.

1(in the hollywood sense…)

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-22 -20 -18MV

2

1

0U

- V

-22 -20 -18Mi

0.1(g

- r

)

0.5

1.0z = 0.1

0.8 < z < 0.9

SDSS, Blanton et al. 2002 COMBO-17, Bell et al. 2004

Red sequence of massive glxs

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The (partial) state of affairs

• The bimodality & the puzzle of the red sequence (old! red! massive!) is cast against the LCDM juggernaut. – Feedback (AGN? Other? Duty cycles?

Consistency?)

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The (partial) state of affairs

• The bimodality & the puzzle of the red sequence (old! red! massive!) is cast against the LCDM juggernaut. – What are the physical causes of this bimodality?– When do galaxies “populate” the RS, and how? – Is “feedback” the panacea? (AGN? Other? Duty cycles?)– Merger types (dry mergers’ role? Especially at z<1.)– Are there evolutionary tracks through the green valley?– When & how do the observed scaling relations emerge?

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MGCT2 workshop themes

1. The Emergence of the Red Sequence and Scaling Relations

2. The Evolution of Mass in Massive Galaxies3. The Star Formation Histories of the Most

Massive Galaxies4. The Role of AGN in the Most Massive

Galaxies5. Spitzer’s Impact on the subject6. Ways forward

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Talks & discussions

• All talks are being taped!• Please feel free to use the easel boards!• All discussion periods have moderators.• Alice Shapley will give a workshop summary at

the very end.• There will be no proceedings beyond a tastefully

done web-based record;• That said, the SOC+ will attempt a concise

synthesis paper, possibly for astro-ph. Comments and suggestions welcome!

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Discussion moderators

• Session 1 - Chung-Pei Ma• Session 2 - Greg Rudnick• Session 3 - Simon White• Session 4 - Arjun Dey• Session 5 - Lin Yan• Session 6 - Sandy Faber

Chat with them about discussion

points!

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Our role at this workshop

• Participate in the discussions, both the structured and informal ones. (Employ as many cocktails as necessary!)

• Moving past survey data-gathering or model-building details, let us concentrate on the emergent key issues fun stuff!

• Please ponder what the last session is about. We’re excited to see what this is as well!

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Welcome & enjoy! Announcements:

• Group photo tomorrow

• Please sign up for mirror lab tour or for Friday hike