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Galactic and Extragalactic High Velocity Clouds

High-Velocity Clouds (HVCs), those assemblies of gas around galaxies that do not follow galactic rotation, have been enigmatic since their discovery almost 60 years ago. Recent advances both observational and theoretical have clarified their properties and their importance to galaxy formation and evolution. To explore this topic further a Green Bank Workshop on “Galactic and Extragalactic High-Velocity Clouds” will be held June 26-29, 2022. It will bring together scientists with a diverse range of interests for lively discussions of the latest observations, computational models and theoretical considerations.

The Workshop will be held at the Green Bank Observatory, where the great natural beauty and intimate setting produce meetings characterized by a high level of interaction. Because of logistical considerations, attendance will be limited to 45 participants.


Lodging will be at the Observatory or at nearby locations. All meals will be served in the Observatory Cafeteria. A single fee of $550 per participant will cover all local expenses including lodging and meals. It
may be possible to waive this cost for some of the participants.

Accommodations for accompanying persons and child care will be available.

Travel Information

The easiest way to get here is to follow the directions on our “Getting Here” page. Please do note that some GPS systems do not always give the best route to the Green Bank Observatory, and nothing beats the good old-fashioned paper map for navigation.

We will attempt to coordinate ride-sharing from airports if there is interest.

Workshop Schedule

The workshop will begin with an informal reception at Sunday, June 26. Formal sessions will start on Monday June 27 and continue through the morning of June 29. There will be evening sessions June 27 and June 28. The workshop will end with lunch on Wednesday June 29. A detailed program will be available at a later date from this webpage.

Topics to be considered include:

  • The origin of HVCs
  • New observations
  • Magnetic, ionized, metal, and dark matter components
  • The Magellanic Stream
  • HVCs in other galaxies
  • HVCs effect on our Galaxy and its CGM
  • HVCs as probes of their environments
  • The fates of HVCs
  • The connection between nuclear winds and HVCs
  • Intermediate Velocity Clouds and their Connections to HVCs

Scientific Organizing Committee

  • Kat Barger (TCU)
  • Joss Bland-Hawthorn (Univ. Sydney)
  • Andy Fox (STScI)
  • Filippo Fraternali (Univ. Groningen)
  • Jay Lockman (Green Bank Observatory)
  • Naomi McClure-Griffiths (Australian National Univ.)
  • Mary Putman (Columbia Univ.)
  • Robin Shelton (Univ. Georgia)

Registered Participants

Will ArmentroutGreen Bank Observatory
Lucia ArmillottaPrinceton University
Dr. Trisha AshleySpace Telescope Science Institute
Kat BargerTexas Christian University
Bob BenjaminUniversity of Wisconsin
Rongmon BordoloiNorth Carolina State University
Greg BryanColumbia University
Francie CashmanSpace Telescope Science Institute
Erica ChwalikMontana State University
Enrico Di TeodoroJohns Hopkins University
Andy FoxSTScI
David M. FrenchSTScI
Hansung GimMontana State University
Eric GoetzUniversity of Georgia
Asger GronnowKapteyn Institute, University of Groningen
Fabian HeitschUNC Chapel Hill
Alex S. HillUBC Okanagan / DRAO
Chris HowkUniversity of Notre Dame
Jim JacksonGreen Bank Observatory
Lyla JungAustralian National University
Dhanesh Krishnarao (DK)Johns Hopkins University / Colorado College
Glen LangstonNational Science Foundation
Nicolas LehnerUniversity of Notre Dame
Jay LockmanGreen Bank Observatory
Scott LucchiniUniversity of Wisconsin – Madison
Antonino MarascoINAF – Padova Observatory
Jennifer Donovan MeyerNRAO
Toney MinterGreen Bank Observatory
David NideverMontana State University
D.J. PisanoUCT/WVU
Mary PutmanColumbia University
Evan SchneiderUniversity of Pittsburgh
Nigel SharpNational Science Foundation
Dr. Robin SheltonUniversity of Georgia
Allison SmithArecibo Observatory
Brent TanUCSB
Todd TrippUniversity of Massachusetts – Amherst
Ananya TuliPhD candidate at the University of Notre Dame
Jo VazquezTexas Christian University
Bart WakkerUniversity of Wisconsin-Madison
Chen WangUniversity of Georgia
Jessica WerkUniversity of Washington
Ellie WhiteGreen Bank Observatory
Yong ZhengUC Berkeley

Local Organizing Committee

  • Brenne Gregory
  • Sue Ann Heatherly
  • Jay Lockman
  • Pedro Salas
  • Ellie White