Galaxy Evolution in Groups and Clusters at 'low' Redshift: Theory and Observations

Exploring the intricate relationship between member galaxies and their hosts

Scientific Organizing Committee

Annalisa Pillepich (MPIA)
Alessandro Boselli (Universite’ de Marseille)
Laura Ferrarese (Herzberg Institute, Victoria
Andrey Kravtsov (U. of Chicago)
Thorsten Lisker (U. of Heidelberg)
Laura Sales (UC Riverside)
Rory Smith (Yonsei University)

Local Organizing Committee

Susanne Koltes (MPIA)
Martina Donnari (MPIA)
Elad Zinger (MPIA)



Mike Anderson (MPA)
Yannick Bahe (MPA)
Bahar Bidaran (U. of Heidelberg)
Alessandro Boselli (Universite’ de Marseille)
Mike Cooper (UC Irvine)
Luca Cortese (ICRAR)
Martina Donnari (MPIA)
Eric Emsellem (ESO)
Christoph Engler (U. of Heidelberg)
William Forman (CfA)
Matteo Fossati (MPE)
Oleg Gnedin (U. of Michigan)
Bruno Henriques (ETH Zurich)
Pavel Jachym (Boční)
Christine Jones (CfA)
Gandhali Joshi (MPIA)
Jeff Kenney (Yale)
Claudia Lagos (ICRAR)
Ryan Leaman (MPIA)
Yen-Ting Lin (ASIIA)
Thorsten Lisker (U. of Heidelberg)
Davide Martizzi (UC Berkeley)
Sean McGee (Birmingham)
Brian McNamara (U. of Waterloo)
Josephina Michea (U. of Heidelberg)
Dylan Nelson (MPA)
Reynier Peletier (Groningen)
Eric Peng (Kavli/Peking U.)
Annalisa Pillepich (MPIA)
Bianca Poggianti (Osservatorio di Padova)
Marc Postman (Space telescope)
Marina Rejkuba (ESO)
Vicente Rodriguez-Gomez (Space Telescope)
Elke Roediger (U. of Hambourg)
Teymoor Saifollahi (U. of Groningen)
Laura Sales (UC Riverside)
Ruben Sanchez-Janssen (Edinburgh)
Paolo Serra (Osservatorio di Cagliari)
Rory Smith (KASI)
Elisa Toloba (U. of the Pacific)
Stephanie Tonnesen (Carnegie Observatories)
Frank van den Bosch (Yale)
Bernd Vollmer (Observatoire de Strasbourg)
Benedetta Vulcani (Padova/Melbourne)
Gillian Wilson (UC Riverside)
Carolin Wittmann (U. of Heidelberg)
Masafumi Yagi (National Observatory of Japan)
Sukyoung Yi (Yonsei)
Kiyun Yun (MPIA)
Elad Zinger (MPIA)


We are planning a very interactive meeting focused on understanding and quantifying the complex interplay between galaxies and the groups and clusters they live in.

Key Subjects:

  • Galaxy transformations within groups/clusters.
  • Environmental effects on: SF, stellar morphology, gas content and structure.
  • The various forms of SF quenching.
  • Dynamical, hydro-dynamical and thermal gas stripping.
  • Galaxy-gaseous halo interactions.
  • Stellar mass assembly: BCGs, ICL and Globular Clusters
  • Multi-wavelength observations of group and cluster galaxies, with a focus on their inner structural properties.

  • Science Goals for the Meeting:

  • To find connections between the various observational statements and spell out, in light of the existing models and in a quantitative fashion, the physical mechanisms behind such observational results.
  • To focus on the connections and interactions among the different cluster components: satellite galaxies, central galaxy, ICM, diffuse stars and GC. Namely, how do the properties of the ICM affect the central and satellite galaxies? Can GCs act as tracers for the potentials and of the stellar assembly history of the hosts?
  • To focus on both the "low" redshift observations for member galaxies (so to access their structural properties), as well as on the evolution of the BCGs and the host haloes across many Gyrs.
  • How can current cosmological simulations be utilized to better interpret the observational data? To that end, a 'hands-on' tutorial will be held on how to access and use Illustris-like cosmological simulations to achieve this goal.
  • Talks & Slides

    Day 1

    Participant Introduction
    Observations Review
    Numerical Models Review

    Gravity Related Environmental Effects

    Frank van den Bosch: The Tidal Evolution of Satellite Galaxies
    Rory Smith: ~Half the Cluster Population were Pre-processed - Insights from High-Res Cosmo Sims. (missing)
    Carolin Wittmann: Were the most compact and diffuse stellar systems in galaxy clusters both formed by tidal stripping?
    Gandhali Joshi: Mass loss and preprocessing of group galaxies
    Paolo Serra: Tidal effects in groups and the Fornax cluster

    Day 3

    ICL and globular clusters

    Eric Peng: Globular clusters in low-mass galaxies as probes of quenching
    Laura Sales: Modeling globular clusters on cosmological simulations of Virgo-like objects
    Oleg Gnedin: On the origin of the correlation between halo mass and its globular cluster system mass
    Ryan Leaman: The Survival of a Relic Galaxy in the Centre of Perseus as traced by its Globular Clusters (Missing)

    Day 4

    Galaxy transformations and quenching, now and then

    Yen-Ting Lin: Cluster galaxy population evolution from the Subaru Hyper Suprime-Cam survey: brightest cluster galaxies, stellar mass distribution, and active galaxies
    Mike Cooper: Project Purple Rain: When Doves Cry, Satellites Quench
    Gillian Wilson: Galaxy Quenching in Clusters and Growth of BCGs
    Martina Donnari: The effects of environment on the star formation activity of galaxies with the IllustrisTNG simulation
    Vicente Rodriguez-Gomez: Galaxy mergers in different environments
    Rory Smith: A Phase-space View of Simulated and Observed Environmental Effects
    Sukyoung Yi: First results from Yonsei Zoom In Cluster Simulations
    Bahar Bidaran: Dwarf progenitors - what we can learn from circular velocity profiles?
    Claudia Lagos: The connection between mass, environment and slow rotation in simulated galaxies
    Christine Jones: The Infall of Elliptical Galaxies into the Virgo and Fornax Clusters

    Day 5

    Workshop Venue

    Schloss Ringberg

    The workshop will be held in the Schloss Ringberg, overlooking the Tegernsee Lake, in Southern Bavaria. Lodging and meals will be provided at the castle as well. For more information on the castle see here.

    Students and participants traveling with family will be lodged in Hotel Bachmair Alpina, with taxi transports in the mornings and evenings.

    Hotel Bachmair Alpina
    Valepper Str. 24
    83700 Rottach-Egern
    Phone: +49-(0)8022-9288850


    Important Dates and Times

    Beginning of the Workshop: Monday, Dec 11th at 2.30 pm. lunch will be served starting at 1.00 pm.

    Conclusion of the Workshop: Friday, Dec 15th at 12:30 pm. unch will be served shortly after. ​

    NOTE: By default, check-in at the Castle is on Monday morning and check-out on Friday morning. ​

    If strictly needed, lodging for a few can be arranged starting from Sunday afternoon, when a porter will let the guests in and give them the keys. IMPORTANT: There will be no dinner served on Sunday evening, the first meal will be breakfast on Monday morning. Transportation to the castle on Sunday afternoon must be arranged by the individuals. Alternatively, participants may want to spend the evening in Munich and then leisurely take the train towards Tegernsee on Monday morning.


    Public transports work very well in Bavaria.
    It is possible to travel by train from Munich Airport to the Tegernsee Station in about 2 hours for about 23 EUR and from Munich Main Station to the Tegernsee Train Station in about 1 hour for about 15 EUR: see

    Further directions to the Castle can be found here .

    ​If traveling at special times, please contact Taxi Kaufmann ( Tel. +49 (0)8022 / 5555.


    The conference fee of 300 Euros and travel costs will be borne by the participants. We ask you to pay the registration fee in *cash* at the castle registration desk.

    The organized bus/shuttle services as well as the accommodation and all meals will be covered by the organizers through Max Planck Society grants.