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Santa Cruz Redwood Grove
2012 Galaxy Workshop Participants. Photo: Sue Grasso


Welcome to the 2012 Santa Cruz Galaxy Workshop homepage!
Organizers: Avishai Dekel and Joel Primack.
Click here to visit the 2011 Santa Cruz Galaxy Workshop Website.

Purchase tickets for Shakespeare Santa Cruz's production of Twelfth Night. Find out more





Images: Trudy E. Bell, Senior Writer, UC-HiPACC


Program - Tentative

click on the talk title for electronic version of talk

Monday, August 13, Session I: High-z Galaxies (Chair: Koo)
9:30 - 9:35 (5m) Dekel & Primack Opening remarks
9:35 - 9:40 (5m) George Blumenthal (UCSC) Chancellor Greetings
9:40 - 10:05 (20m) Garth Illingworth (UCSC) Exploring the first gyr: Galaxy buildup at early times   [mov]
10:05 - 10:25 (16m) Pascal Oesch (UCSC) Galaxy build-up in the heart of cosmic reionization  [mov]
10:25 - 10:50 (20m) Rychard Bouwens (Leiden) (tentative title): Galaxies at very high redshift  [mov]
10:50-11:20 Break
11:20 - 11:45 (20m) Sadegh Khochfar (MPE) High redshift galaxy formation: The growth spurt phase  [mov]
11:45 - 12:05 (16m) Peter Behroozi (KIPAC) Galaxy star formation histories and rates from z=0-8  [mov]
12:05 - 12:25 (16m) Yicheng Guo (Umass) Formation of the Hubble Sequence at High Redshift  [mov]
12:25 - 12:40 (20m) Discussion
12:40 - 2:00 Lunch

Session II : Spheroids;  Star Formation (Chair: Klypin)
2:00 - 2:25 (20m) Brad Holden (UCSC) Scaling relations and size evolution in galaxy populations  [mov]
2:25 - 2:50 (20m) Charlie Conroy (UCO/Lick) Elliptical galaxies come into focus
2:50 - 3:10 (16m) Desika Narayanan (Arizona) The Jeans conjecture and the IMF  [mov]
3:10 - 3:35 (20m) Jean Brodie (UCSC) Globular clusters: Chemodynamical tracers of galaxy assembly  [mov]
3:35 - 4:15 Break
4:15 - 4:40 (20m) Mark Krumholz (UCSC) The (Non?)-universality of the IMF  [mov]
4:40 - 5:05 (20m) Nick Gnedin (Uchicago) Star formation on galactic scale: make life simple  [mov]
5:05 - 5:25 (16m) Alberto Dominguez (UCR) Dust extinction at 0.75<z<1.5 with HST/WFC3   [mov]
5:25 - 5:45 (20m) Discussion
6:15 - 7:00 Banquet reception
7:00 - 8:30               Banquet dinner, with program in honor of Garth Illingworth                                 

Tuesday, August 14, Session III: Spiral Galaxies and the Local Group (Chair: Gnedin)
9:30 - 9:50 (16m) Susan Kassin (NASA) The epoch of disk settling: z~1 to now  [mov]
9:50 - 10:05 (12m) Joel Roediger (Queens) Lessons from stellar population analyses in the nearby Universe  [mov]
10:05 - 10:30 (20m) Aaron Romanowsky (UCO/Lick) Revisiting angular momentum and galaxy formation  [mov]
10:30 - 11:00 Break
11:00 - 11:20 (16m) Mike Boylan-Kolchin (UCI) Measuring the mass of the MW  [mov]
11:20 - 11:45 (20m) Sukanya Chakrabarti (Florida) A New Probe of the Distribution of DM in Galaxies  [mov]
11:45 - 12:00 (12m) Sebastian Trujillo-Gomez (NMSU) Radiative feedback in cosmological simulations of galaxy formation  [mov]
12:00 - 12:20 (20m) Discussion
12:20 - 1:40 Lunch

Session IV:Dwarf Galaxies & Feedback (Chair: Conroy)
1:40 - 2:05 (20m) David Koo (UCSC) Galactic outflows and inflows among z~1 galaxies  [mov]
2:05 - 2:25 (16m) Charlotte Christensen (Arizona) Star formation and feedback with H2  [mov]
2:25 - 2:45 (16m) Yu Lu (Standford) Stellar feedback in galaxy formation
2:45 - 3:10 (20m) James Wadsley (McMaster U) Redistributing matter in dwarf galaxies: cusps and cores  [mov]
3:10 - 3:40 Break
3:40 - 4:05 (20m) James Bullock (UCI) Feedback & the too-big-to-fail problem of MW satellites  [mov]
4:05 - 4:25 (16m) Adi Zolotov (Jerusalem) Why dwarf satellites have reduced central masses  [mov]
4:25 - 4:45 (16m) Alyson Brooks (Uwisc) Reproducing the dwarf spheroidal satellites  [mov]
4:45 - 5:10 (20m) Anatoly Klypin & Kenza Arraki (NMSU) Effects of baryons on the circular velocities of dwarf satellites  [mov]
5:10 - 5:40 (30m) Panel on dwarfs

Wednesday, August 15, Session V:
High-z Clumpy Disks (Chair: Tacconi)
9:30 - 9:55 (20m) Avishai Dekel (Jerusalem) In-situ and ex-situ galaxy evolution at high redshift  [mov]
9:55 - 10:10 (12m) John Forbes (UCSC) Large populations of gravitationally unstable galaxies  [mov]
10:10 - 10:30 (16m) Shy Genel (CfA/Harvard) SFGs at z~2: accretion, turbulence, and feedback  [mov]
10:30 - 10:45 (12m) Sarah Newman (UCB) Outflows in high-z galaxies  [mov]
10:45 - 11:15 Break
11:15- 11:40 (20m) Reinhard Genzel (Munich) The nature of dispersion dominated z~1-3 star forming galaxies
11:40 -12:05 (20m) Stijn Wuyts (MPE) Clump longevity in high-z galaxies  [mov]
12:05 - 12:20 (12m) Nir Mandelker (Jerusalem) Giant clumps in simulations of high-z disc galaxies  [mov]
12:20 - 12:35 (12m) Mark Mozena (UCSC) Clumpiness in CANDELS and hydro simulations  [mov]
12:35 -12:50 (25m) Discussion
12:50 - 2:00 Lunch

Session VI: Quenching, red nuggets, & blue nuggets (Chair: Bullock )
2:00 - 2:15 (12m) Christopher Moody (UCSC) Galaxy colors in radiative-transfer simulations  [mov]
2:15 - 2:30 (12m) Niraj Welikala (IAS) Galaxy color gradients out to z~3  [mov]
2:30 - 2:45 (12m) Joanna Woo (Jerusalem) Quenching of Centrals  [mov]
2:45 - 3:00 (12m) Edmond Cheung (UCSC) The Dependency of Quiescence on Inner Galactic Structure  [mov]
3:00 - 3:15 (12m) Jerome Fang (UCSC) The quenching of star formation in SDSS galaxies  [mov]
3:15 - 3:30 (12m) Coral Wheeler & John Phillips (UCI) Satellite quenching near MW-sized galaxies [Wheeler][Phillips]  [mov]
3:30 - 4:00 Break
4:00 - 4:20 (16m) Guillermo Barro (UCSC) CANDELS: The progenitors of compact quiescent galaxies  [mov]
4:20 - 4:35 (12m) Lauren Porter (UCSC) Quenching in SAM   [mov]
4:35 - 4:55 (16m) Daniel Ceverino (UAM) Morphology and size evolution of Red Nuggets  [mov]
4:55 - 5:10 (12m) Dylan Tweed (Jerusalem) The origin of bulges in cosmological simulations  [mov]
5:10 - 5:35 (20m) Andi Burkert (Munich) The bulge-halo conspiracy of elliptical galaxies  [mov]
5:35 - 6:00 (25m) Panel Faber, Dekel, ...

Thursday, August 16, Session VII: IGM, CGM, ISM (Chair: Mayer)
9:30 - 9:50 (16m) Phil Hopkins (UCB) The ISM and feedback: order from chaos  [mov]
9:50 - 10:10 (16m) Jessica Werk (UCSC) Preponderance of metals in the CGM  [mov]
10:10- 10:25 (12m) Fulai Guo (UCSC) The Origin and Implications of the Fermi Bubbles  [mov]
10:25 - 10:50 (20m) Rupert Croft (CMU) Lyman alpha from high-z galaxies  [mov]
10:50 - 11:20 Break
11:20 - 11:40 (16m) Chao-Chin Yang (UCSC) Thermal-Instability-Driven Turbulent Mixing in Galactic Disk[mov]
11:40 - 12:05 (20m) Linda Tacconi (MPE) Molecular gas and scaling relations in z=1-2 galaxies
12:05 - 12:20 (12m) Jacob Arnold (UCSC) The chemo-dynamical structure of galaxy halos  [mov]
12:20 - 12:40 (20m) Discussion
12:40 - 2:00 Lunch

Session VIII: DM halos; BHs & AGNs (Chair: Krumholz)
2:00 - 2:25 (20m) Tom Abel (KIPAC) The Evolution of DM in phase space  [mov]
2:25 - 2:40 (12m) Shea Garrison-Kimmel (UCI) The Andromeda effect: DM Halos in the LG  [mov]
2:40 - 2:55 (12m) Miguel Rocha (UCI) Cosmological simulations with self-interacting DM  [mov]
2:55 - 3:15 (16m) Michael Kuhlen (UCB) Impact of baryonic physics on DM detection experiments  [mov]
3:15 - 3:30 (12m) Rachel Reddick (Stanford) The galaxy-DM connection in the local Universe  [mov]
3:30 - 4:00 Break
4:00 - 4:25 (20m) Chung-Pei Ma (UCB ) Revisiting black hole mass and host galaxy scaling relations[mov]
4:25 - 4:50 (20m) Tizianna Di Matteo (CMU) Cold flows and the first quasars  [mov]
4:50 - 5:10 (16m) Colin DeGraf (CMU) High-z black hole growth and the M-sigma relation  [mov]
5:10 - 5:35 (20m) Benjamin Weiner (Arizona) Starburst-QSO evolutionary stages and feedback  [mov]
5:35 - 6:00 (25m) Panel: AGN Feedback Madau, Hopkins, Di Matteo, Mayer [mov]
7:30                          Shakespeare SantaCruz presents Twelfth Night at the UCSC Performing Arts Mainstage (light                                  dinner available for purchase before the play)

Friday, August 17, Session IX: Joint Session of Galaxy + Simulation Workshops
                                 Start with coffee break this morning
10:40 - 11:10 Break
Session IX-1.  Introduction to the Project  Chair: Madau 
11:10 - 11:35 (20m) Joel Primack (UCSC) Introduction and Rationale of the Comparison Project   [mov]
11:35 - 12:00 (20m) Romain Teyssier (Zurich) Galaxy Formation: Big and Small   [mov]
12:00 - 12:25 (20m) Lucio Mayer (Zurich) Black Hole Seeds in High-z Galaxy Mergers  [mov]
12:25 - 12:35 (10m) Discussion  
12:35 - 2:00 Lunch
Session IX-2.  The Eris Simulation  Chair: Abel 
2:00 - 2:25 (20m) Javiera Guedes (Zuirch) The Eris Simulation  [mov]
2:25 - 2:50 (20m) Sijing Shen (UCSC) The Circumgalactic Medium of Galaxies from High Resolution Zoom-in SPH Simulations  [mov]
2:50 - 3:15 (20m) Annalisa Pillepich (UCSC) The effects of baryons on the subhalos of MW-like galaxy  [mov]
3:15 - 3:30 (15m) Discussion  
3:30 - 4:00 Break
Session IX-3.  Realistic Physics in Simulations  Chair: Abel 
4:00 - 4:25 (20m) John Wise (Georgia Tech) The Reionizers: High-z Dwarf Galaxies  [mov]
4:25 - 4:50 (20m) Phil Hopkins (UCB) Towards realistic feedback in high-redshift galaxy formation simulations  [mov]
4:50 - 5:10 (16m) Ji-hoon Kim (UCSC) GF with black holes and radiating star clusters  [mov]
5:10 - 5:30 (16m) Amit Kashi (UNLV) A Cold Channel for Black Hole Accretion in Cosmological Simulations  [mov]
5:30 - 5:40 (10m) Discussion  

                Galaxy Simulation Comparison Project - an extension of the Santa Cruz Galaxy Workshop                

8/18 (Sat) - Rm 102, ISB

9:00 - 9:30AM Continental Breakfast
Session X  Definition of the Project Chair & Discussion Moderator: Primack
9:30 - 9:50 (20m) Joel Primack (UCSC) The Design of the Simulations: project definition, initial conditions, simulation parameters, minimal physics requirement
9:50 - 10:10 (16m) Ji-hoon Kim (UCSC) Proposed Cosmological Initial Condition
10:10 - 10:30 (16m) Oliver Hahn (Stanford) MUSIC: MUlti-Scale Initial Conditions Generator
10:30 - 10:50 (16m) Romain Teyssier (Zurich) Proposed Isolated Initial Condition
10:50 - 11:20 Break
11:20 - 12:30 Tom Abel, Nick Gnedin, Anatoly Klypin, Piero Madau, Lucio Mayer, Thomas Quinn, Romain Teyssier, James Wadsley, John Wise, etc. Panel Discussion: project ideas by key persons of each participating group, future development plan for each group
12:30 - 1:50 Lunch
Session XI  Frontier of Numerical Simulation Chair: Wise
1:50 - 2:15 (20m) Thomas Quinn (Washington) Using Advanced Parallel Computing Language for Galaxy Formation Simulations
2:15 - 2:40 (20m) Justin Read* (Zurich & Leicester) Galaxy Formation in SPHS
2:40 - 3:00 (16m) Matthew Turk (Columbia) yt: A Cross-Platform Toolkit for Astrophysical Analysis
3:00 - 3:20 (16m) Jose Onorbe (UC Irvine) How to Zoom: Lagrange Volume and Other Halo Properties
3:20 - 3:35 (12m) Christine Simpson (Columbia) The Effect of Feedback and Reionization on Star Formation in Low-mass Dwarf Galaxy Halos
3:35 - 4:05 Break
4:05 - 5:15 Working Session I Ideal Goals: start generating ICs based on the consensus made, post ICs for all codes, each group tests whether its IC is readable, finally post first figures on the collaboration workspace
6:00 - 8:00 Dinner Dinner at Joel Primack's house

8/19 (Sun) - Rm 102, ISB

Session XI  Frontier of Numerical Simulation Chair: Wise
9:00 - 9:30AM Continental Breakfast  
9:30-10:40 Working Session II Grouped by participating code
10:40-11:10 Break
11:10-11:40 Joel Primack & Piero Madau (UCSC) The Way Forward: talks that summarizes the consensus made in the workshop, future timeline, point person for each group
11:40-12:30 Working Session III Grouped by participating code
12:30-2:00 Lunch  
2:00 ~Goodbye~  

8/20 (Mon) - Rm 102, ISB

9:00 - 5:00PM   Feel free to stay and work if you like


*For the tentative scientific program of the Starting Workshop of the Santa Cruz High-Resolution Galaxy Comparison Project, visit here

Directions and Transportation

Map of Baskin EngineeringDirections
This year's workshop, like the 2011 workshop, will be held in the Simularium, located in room 180 of the Engineering 2 (E2) Building in the northwest corner of UCSC, on Science Hill.

Instead of entering UCSC at the main entrance, it's best (because of road construction) to turn left approaching the campus on Bay St. and continue on High St./Empire Grade to the west entrance to UCSC. After entering UCSC, continue on Heller Drive to the multi-level parking garage called Core West Parking Structure, which is the closest parking to Baskin Engineering (view map).

You can also get door-to-door directions from Google Maps.

Within the parking structure, a permit is required to park in the reserved spaces: see Parking below.

A complete UCSC campus map is available, as is a web site dedicated to UCSC maps.

Directions to University of California Santa Cruz are also available from:


All Galaxy Workshop parking should be done at the West Core Parking Structure (see map above). On Aug. 13th, the first day of the workshop, Parking Attendants will have a booth on the second level of the Core West Parking Structure to hand out previously purchased permits. You must visit this booth if coming the first day, which will have signs pointing to it and will be very visible, in order to get your permits. You may also purchase permits at this booth with cash or check. (They cost $6/ permit). The booth will be up from 8:30 am to 10am. Visitors who arrive after 10am may park in a meter space on the second level of the parking structure; you must purchase a parking ticket and place it on your dashboard. Visitors can also get the required A-level parking permit from kiosk at UCSC's main entrance.

If you are arriving for the Galaxy Workshop later than the first day, you must visit the kiosk at the base of campus to pick up your permits. Please park at the West Core Parking Structure. Other workshop materials will be given to you during coffee break.

Finding your way to the Galaxy Workshop
Once you have parked at the Core West Structure, please follow signs to the Simularium (Room 180) in E2. HiPACC Administrator, Sue Grasso, will be waiting there with name tags and other important workshop materials.

Airport shuttles
Shuttle services from the airport to campus or to your lodging are available for a fee:

Public transport
Public transportation options to, from, and around Santa Cruz can be found at I Ride the Bus.

Local Lodging Options

 You may visit the Business Contracts website to check for current Agreements. Please note that there are no active Agreements with any local lodging vendors at this time.
 The Mission Inn is offering a special rate of $90.00/day for single occupancy rooms and $100.00/day for a double occupancy rooms during the workshop period, Aug.12-20, 2012. The rooms are first come first serve, as they cannot be "reserved" without a UC Trip ID # or a personal credit card. However, per previous conversations, the Mission Inn has availability during the workshop dates, and is aware of the dates of the workshop. If travelers provide the number, UCSC/FET-121307, and confirm that they are attending the UCSC/SCIPP/UC-HIPACC Galaxy Workshop, they will receive the lower rates.

Once the Mission Inn no longer has rooms available, the following local lodging vendors are suggested:

If you will be staying an additional week for collaboration, either before or after the workshop, you may want to try the following suggestions for a bit longer term and possibly less expensive housing:

  • Craig's List - Craig's List shows housing for rent in many areas- just select the Santa Cruz locations from the following Monterey Bay Area list


In addition we have a listing from Academic HR, which contains many housing options for extended stays, typically in faculty/UCSC employee houses. This list is available upon request.
For questions about accommodation contact UC-HIPACC staff ""


UC-HIPACC (University of California High Performance AstroComputing Center) is co-sponsoring the 2012 Galaxy Formation Workshop.

UC-HIPACC's major purpose is to encourage collaboration on computational astrophysics between groups at UC campuses and DOE Labs. We are willing to help with lodging support for those UC students interested in attending the Galaxy Formation Workshop. If you are interested in UCSC housing support please send an email UC-HIPACC staff, ""

Other Useful Information

Avishai Dekel (dekel[at]
Joel Primack (joel[at]
Nina McCurdy (nmccurdy[at]
UC-HIPACC staff (hipacc[at]

Registration & Questionnaire

Please sign up with your proposed talk title at


Please take a minute to register, at your earliest convenience, at:

This is important!

You will be asked to provide information including specific days of attendance, parking, and meal requests, and you will then be directed to a secure web site to provide payment information. Everyone who wants to attend MUST register to ensure that the proper accommodations are in place.

There is no general registration fee. You will be asked to pay by credit card $6 per day for a UCSC campus parking permit, $12 per lunch, and $40 per banquet ticket. The Galaxy Workshop banquet will be Monday night August 13; the guest of honor this year is Garth Illingworth.

The deadline to register is one week from today: Monday, August 6.

Any questions regarding registration may be directed to Nancy Moore at and by phone at 831-459-5092, or to Sue Grasso at

Shakespeare Santa Cruz

Season 2011UC Santa Cruz is home to one of America's great Shakespeare Festivals, which coincides with our Galaxy Workshop. For the past few years a highlight of our workshop has been an evening together at a Shakespeare play, and this year we have reserved 20 tickets for Twelfth Night on the night of Aug 16, at a group discount of $38/ticket. The first 20 workshop participants to sign up will get this price. The regular price is $43. If more than 20 people sign up, there will most likely be more tickets available but at the higher rate.

**7/30 Update** Unless a sudden rush of you order tickets in the next two days we won't get the discounted group rate, but you can still get great seats if you order at the regular ticket price of $43 by Thursday, August 2. After that, we will lose the reservations. Please email Nancy Abrams ( by noon on Thursday, August 2 if you would like a ticket. You can still buy a ticket on your own later, but the best seats are only being held for our group till August 2.

To find out more about Shakespeare Santa Cruz and this performance of Twelfth Night, visit

Three other great productions are going on in repertory with Twelfth Night, in case you want to see them all: Henry IV, Part two, The Mandrake, and a world premiere of The Man in the Iron Mask, adapted from the novel by Alexandre Dumas.

Click here for more details.

To sign up for tickets to go with the group on Aug. 16, please email Nancy Abrams at with your name and the number of tickets you want. If you have a US checking account, you must send Nancy the money to keep your reservation (check should be made out to Nancy Abrams). Use this address: Nancy Abrams, 575 High St., Santa Cruz, CA, 95060. If you are coming from abroad and can't write a check in US dollars, you may pay her when you get here. If you want to go to any other performance, you can buy tickets online at

Sister Workshop

Announcing the 1st Workshop for Santa Cruz High-resolution Galaxy Simulation Comparison Project!

Visit the workshop website:

The kickoff workshop of the Santa Cruz High-resolution Galaxy Simulation Comparison Project will be August 17-19, 2012. On Aug.17 (Fri) the Simulation Comparison Workshop and our own Galaxy Workshop will hold joint sessions. If you are interested in participating in this project, please consider registering for the Simulation Comparison Workshop by clicking the link above!