Scientific Rationale

This workshop is the sixth in a series and will be organized for the first time in Poland, in the city with astronomical tradition where the Nicolaus Copernicus was born.

According to the commonly accepted evolutionary scheme of radio-loud active galactic nuclei (AGN) the GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources are the early stages of this evolution. Their radio jets have sizes smaller than few kiloparsecs and the whole radio structure reside within the interstellar medium of the host galaxy. In addition to size, the characteristic feature of these objects is the fact that their radio spectra have convex shapes with peak emission frequency inversely proportional to the source size. During the evolution, the radio jets of GPS and CSS sources start to cross the boundary between the interstellar and the intergalactic medium. The compact radio source can grow further to become large-scale object or its development can be halted at parsec scale for reasons which are under extensive debate nowadays. The early phases of radio source evolution potentially represent an important galaxy feedback process and determine the life cycle of the galaxy.

The current possibility of combination of high resolution radio and optical imaging as well as the X-ray and Gamma-ray observations in the research of CSS and GPS sources is a powerful scientific tool. Thanks to new facilities like MWA and LOFAR radio telescope the radio imaging is extended now to very low frequencies. This opens new possibilities in study of CSS and GPS namely the extended steep spectrum emission that may surround the objects, the origin of their characteristic convex spectral shape and recurrent radio activity.

The aim of this meeting is to present the latest research results and conduct fruitful discussions by theoreticians and observers of CSS and GPS sources in the widest possible frequency range.

Previous CSS/GPS workshops: Dwingeloo (1990), Leiden (1996), Kerastari (2002), Riccione (2008), Rimini (2015)


The workshop will start on Wednesday morning and finish on Friday afternoon. The conference dinner and social event will be organised on Thursday afternoon.

Experience in organizing previous workshops allows us to predict that it will be a meeting of about 50 participants. The registration will be open until the maximum number of participants is reached but no longer than to 1st of April.

Organizing Committees

Scientific Organizing Committee (SOC):
  • Tao An (SHAO, China)
  • Joe Callingham (ASTRON, The Netherlands)
  • Daniele Dallacasa (DIFA - UniBO & INAF - IRA, Italy)
  • Preeti Kharb (NCRA-TIFR, India)
  • Magdalena Kunert-Bajraszewska (Nicolaus Copernicus University, Poland)
  • Raffaella Morganti (ASTRON, The Netherlands)
  • Chris O'Dea (University of Manitoba, Canada)
  • Huub Rottgering (Leiden University, The Netherlands)
  • Elaine Sadler (CSIRO, Australia)
  • Aneta Siemiginowska (CfA, USA)
Local Organizing Committee (LOC):
  • Magdalena Kunert-Bajraszewska
  • Aleksandra Wołowska
  • Dominik Wóltański
  • Justyna Cembrzyńska (Aleksander Jabłoński Foundation)
  • Agnieszka Górska-Pukownik (Aleksander Jabłoński Foundation)



This event has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 730562 [RadioNet].