BUFFALO Collaboration (Online) Meeting 2021





BUFFALO is a Hubble Space Telescope Large Program to survey massive clusters of galaxies from the six well-studied Frontier Fields. The primary goal of the survey is to enhance our understanding of the formation and assembly of the most massive and most luminous galaxies in the universe, and how they grew in connection with their dark matter halos. This requires investigating the astrophysics of dark matter itself, as well as cluster gas and dynamics to constrain how and when these galaxies formed. BUFFALO will also provide targets for the upcoming James Webb Space Telescope. Our highly international team consists of nearly 100 astronomers expert in relevant aspects of theory, simulation, and observation.

The BUFFALO 2021 meeting will take place on July 12-13, with two plenary sessions and a breakout working group session each day. The meeting will be held remotely on Zoom (more details to come). There is no registration fee for this meeting.

The deadline for talk submission is July 2, with registration for people not giving talks open until July 11.  Please indicate which sessions you are likely to be able to attend, and we will do our best to accommodate everyone when scheduling talks.

Organizing committee: Mathilde Jauzac, Charles Steinhardt, Ana Acebron, Catherine Cerny, David Lagattuta, Anna Niemiec, Guillaume Mahler, Vadim Rusakov


  • Adi Zitrin
  • Agniva Ghosh
  • Alexandre Jeanneau
  • Ana Acebron
  • Andreas Faisst
  • Andrei Diaconu
  • Andrew Robertson
  • Anna Niemiec
  • Anthony Gonzalez
  • Anton Koekemoer
  • Bahram Mobasher
  • Benjamin Beauchesne
  • Brenda Frye
  • Catherine Cerny
  • Charles Steinhardt
  • Dan Coe
  • David Harvey
  • David Lagattuta
  • Eric Jullo
  • Franz Bauer
  • Guillaume Mahler
  • Hakim Atek
  • Jean-Paul Kneib
  • Johan Richard
  • John Weaver
  • Jose M. Diego
  • Joseph Allingham
  • Juan Remolina Gonzalez
  • Keiichi Umetsu
  • Keren Sharon
  • Liliya Williams
  • Lukas Furtak
  • Marceau Limousin
  • Mario Nonino
  • Martin Sahlén
  • Mathilde Jauzac
  • Matteo Bianconi
  • Matthieu Schaller
  • Mauro Sereno
  • Michael Rich
  • Nícolas Oliveira
  • Pascal Oesch
  • Pascale Hibon
  • Pascale Jablonka
  • Priyamvada Natarajan
  • Richard Massey
  • Stefano Ettori
  • Thomas Greve
  • Tommy Clark
  • Vadim Rusakov
  • Yannick Bahe
    • 14:29 14:30
      Welcome - Mathilde & Charles 1m
    • 14:35 14:50
      Updates on HST data since the 2020 release of full BUFFALO+HFF mosaics to the team 15m
      Speaker: Dr Anton Koekemoer (Space Telescope Science Institute)
    • 14:50 15:05
      Update on ground based imaging of Buffalo clusters 15m
      Speaker: Mario Nonino (INAF-OATs)
    • 15:05 15:20
      Updates from the CHEX-MATE collaboration 15m
      Speaker: Stefano Ettori (INAF OAS Bologna)
    • 15:20 15:30
      Tracing the ICL to Large Radii: MACS J1149 as a Test Case for BUFFALO Clusters 10m
      Speaker: Anthony Gonzalez (University of Florida)
    • 15:30 15:45
      Break: 15 min Break
    • 15:45 16:00
      Robust estimates of the high-redshift galaxy stellar mass function with BUFFALO 15m
      Speaker: Lukas Furtak (Institut d'Astrophysique de Paris)
    • 16:00 16:15
      COSMOS2020: New insights into galaxy assembly and evolution at high-z 15m
      Speaker: John Weaver (DAWN)
    • 16:15 16:30
      Galaxy population constraints on star formation and cosmology in the early Universe 15m
      Speaker: Martin Sahlén (Uppsala University)
    • 16:30 16:45
      BAGPIPES SED fitting and/or JWST HFF observations: UNCOVER, ERS, GTO 15m
      Speaker: Dan Coe (Space Telescope Science Institute)
    • 16:45 17:00
      Break: 15min break
    • 17:00 17:30
      WG session: TWG 1 - Lensing Mass Modeling 30m
      • Ana Acebron
      • Anna Niemiec
      Speakers: Ana Acebron (Ben Gurion University) , Dr Anna Niemiec (Durham University)
    • 17:30 18:00
      WG session: SWG 3 - DM & LSS 30m
      • David Harvey
      • Guillaume Mahler
      Speakers: David Harvey (Leiden University) , Guillaume Mahler
    • 18:00 19:00
      Break: 1h break
    • 19:00 20:00
      Social Activity
    • 14:30 14:45
      Pilot WINGS: An extended MUSE view of the structure of Abell 370 15m
      Speaker: David Lagattuta (Durham University)
    • 14:45 15:00
      Lens modelling of A370 15m
      Speaker: Anna Niemiec (University of Michigan)
    • 15:00 15:15
      Modelling electron clouds with strong gravitational lensing 15m
      Speaker: Joseph Allingham (University of Sydney)
    • 15:15 15:30
      Improving parametric mass modelling of lensing clusters through a perturbative approach 15m
      Speaker: Benjamin Beauchesne
    • 15:30 15:45
      Break: 15 min Break
    • 15:45 16:00
      Is the stellar initial mass function universal? 15m
      Speaker: Vadim Rusakov (University of Copenhagen)
    • 16:00 16:15
      Modelling the density profile of galaxy clusters with MUSE spectroscopy and strong gravitational lensing 15m
      Speaker: Catherine Cerny (Durham University)
    • 16:15 16:30
      Velocity mass relation of cluster member galaxies with MUSE 15m
      Speaker: Guillaume Mahler
    • 16:30 16:45
      Signatures of Mass-to-Light Deviations in Abell 370: A Free-form Reconstruction with GRALE using BUFFALO Strong Lensing Data 15m
      Speaker: Agniva Ghosh (University of Minnesota)
    • 16:45 17:00
      Break: 15 min Break
      • 16:45
        Update on the previous day 15m
    • 17:00 17:10
      Catalog Update 10m
      Speaker: Amanda Pagul (University of California Riverside)
    • 17:10 17:30
      Updates from the WG Leads 20m
    • 17:30 18:00
      30 min discussion - wrap-up 30m
    • 18:00 19:00
      Break: 1hr break 1h
    • 19:00 20:00
      WG session: Observations & catalogues - high redshift 1h
      Speakers: Anton Koekemoer (Space Telescope Science Institute) , Hakim Atek (IAP) , Mario Nonino (INAF-OATs)