HEPRO

The High Energy Phenomena in Relativistic Outflows (HEPRO) conferences are a series of biennial events devoted to discussing the latest developments in theoretical, phenomenological, and observational high-energy and multi-messenger astrophysics, as well as relativistic winds and jets on all scales.

The ninth edition of the conference, HEPRO IX, took place in Rio de Janeiro, Brazil, at the historic Casa de Rui Barbosa site, from August 4 to 8, 2025. Specific topics addressed included the physics and dynamics of jets, as well as their multi-wavelength signatures; the production of cosmic rays, gamma rays, and neutrinos in relativistic outflows; the environments of compact objects; and the physics of relativistic sources, including pulsar wind nebulae, binary systems, gamma-ray bursts, and blazars, as well as particle acceleration.
 

Scientific Editorial Board

Ulisses Barres de Almeida, Brazilian Center for Physics Research )
Gustavo E. Romero, Argentine Institute for Radioastronomy 

Florencia Vieyro, Argentine Institute for Radioastronomy 

Raniere de Menezes, Brazilian Center for Physics Research  

Clarissa Siqueira, National Observatory of Brazil 

Arman Esmaili, Pontifical Catholic University of Rio de Janeiro 

Diego Falceta-Gonçalves, University of São Paulo 

Felix Aharonian, Dublin Institute of Advanced Study 

Elena Amato, INAF-Osservatorio Astrofisico de Arcetri 

Katsuaki Asano, Institute of Cosmic Ray Research 

Alberto Carramiñana, Mexican National Institute of Astrophysics 

Paolo Copi, Yale University 

Roland Crocker, Australian National University 

Elisabete de Gouveia Dal Pino, University of São Paulo 

Francis Halzen, University of Wisconsin at Madison 

Jim Hinton, Max-Planck-Institute for Nuclear Research 

Martin Lemoine, Institute d'Astrophysique de Paris 

Walter Max-Moerbeck, University of Chile 

Reshmi Muckherjee, Columbia University 

Josep Paredes, Universitat de Barcelona 

Anita Reimer, University of Innsbruck 

Nanda Rea, Institute of Space Sciences 

Frank Rieger, University of Heidelberg 

Samar Safi-Harb, University of Manitoba 

Dmitry Uzdensky, University of Colorado at Boulder 

Xiang-Yu Wang, Nanjing University 

Eli Waxman, Weizmann Institute 

Roberta Zanin, Cherenkov Telescope Array Observatory 

The High Energy Phenomena in Relativistic Outflows (HEPRO) conferences are a cycle of biennial events devoted to the discussion of the most recent developments, either theoretical, phenomenological, or observational, on the major themes of high-energy and multi-messenger astrophysics associated with relativistic winds and jets, on all scales.

The HEPRO VIII edition has been held in Paris (France), on the campus of Institut d'Astrophysique de Paris and Observatoire de Paris, from October 23 to October 26, 2023. Some specific themes that were addressed at HEPRO VIII included the physics, dynamics and multi-wavelength signatures of jets, the production of cosmic-rays, gamma-rays and neutrinos in relativistic outflows, the environments of compact objects, the physics of relativistic sources, including pulsar wind nebulae, binary systems, gamma-ray bursts and blazars, and particle acceleration.

The High Energy Phenomena in Relativistic Outflows (HEPRO) conference series are devoted to the discussion of the latest and more relevant observational, phenomenological, and theoretical developments in the field of high-energy astrophysics related to systems displaying relativistic winds and jets.  Some specific topics traditionally included in the HEPRO conferences include gamma-ray production in relativistic outflows, multi-wavelength jet/outflow emission, formation and propagation of relativistic jets, and particle acceleration in different relativistic contexts.
 
Previous editions of HEPRO were held in Dublin (2007), in Buenos Aires (2009), in Barcelona (2011), in Heidelberg (2013), in La Plata (2015), and in Moscow (2017). The next edition will take place in Barcelona on July 9th to 12th 2019, and it will focus on similar topics and with emphasis on the physics of high-energy processes in all kinds of relativistic outflows.  
 
The meeting will be hosted by the Institut de Ciències del Cosmos of the Universitat de Barcelona (ICCUB). The workshop will take place at the Faculty of Physics in the Aula Magna Enric Casassas, which can accommodate up to 190 attendants. There will be invited and contributed talks, posters, and plenty of time for discussion.