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)

Format

This will be a virtual meeting. The workshop will start on Monday morning and finish on Friday afternoon. The talks will be grouped into two time-blocks convenient for participants from different timezones.

The limit of participants is 200 people. Registration will therefore be open until this number of participants is reached, but no later than April 15th.

Organizing Committees

• 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)

• Magdalena Kunert-Bajraszewska
• Aleksandra Wołowska
• Dominik Wóltański
• Roman Feiler
• Justyna Cembrzyńska (Aleksander Jabłoński Foundation)
• Agnieszka Górska-Pukownik (Aleksander Jabłoński Foundation)