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5th Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources

May 27 – 29, 2015

Sporting Hotel, 20 Viale Vespucci

Rimini, Italy

Presentations now available

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Conference dinner pictures

This workshop is the fifth in a series following the 1990 meeting in Dwingeloo, the 1996 meeting in Leiden, the 2002 meeting in Kerastari and the 2008 meeting in Riccione.

The GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources are the most likely candidates for the progenitors of the large scale radio sources. They are powerful but compact radio sources whose spectra are generally simple and convex with peaks near 1 GHz and 100 MHz respectively. In general, the GPS sources are entirely contained within the extent of the narrow line region (< 1 kpc) while the CSS sources are contained entirely within the host galaxy (< 15 kpc). The GPS and CSS sources provide (1) probes of the ISM of the host galaxy, and (2) constraints on the physics of radio galaxy evolution, and (3) provide witness to a very short period of activity of an active galactic nucleus (AGN). As the radio plasma propagates outwards through the host galaxy, it provides feedback in the form of strong shocks which may influence star formation in the galaxy and further fuelling of the AGN, and definitely influences/determines other radiative processes as observed in various bands.

Substantial progress has been made in our understanding of GPS and CSS sources through the combination of high resolution radio, optical and UV imaging as well as IR and X-ray observations, and the availability of GeV observations with the Fermi LAT. Recent work has extended samples of sources to lower power and higher peak frequency. Dramatic improvements to existing facilities (VLA, GMRT, VLBA) and a new generation of radio telescopes (LOFAR, ALMA, and SKA precursors/pathfinders) are impacting our understanding of these interesting sources. This workshop will bring together observers from across the spectrum with theorists for an informal and stimulating exchange of ideas and results.


  • April 15th 2015: Registration deadline


Radionet, the National Institute for Astrophysics (INAF), the Institute of Radioastronomy (IRA) and the Department of Physicis and Astronomy (DIFA) will contribute to reduce the registration fee, in particular for students, postdocs and those eligible for Radionet support.

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The proceedings will appear in Astronomische Nachrichten, which is a fully-refereed journal published both online and in paper form. Details on paper submission will be given at the conference. A hard copy will be sent to each participant.