The Third Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources

3rd GPS/CSS Workshop


Kerastari, Tripolis, Greece


28-31 May 2002


Supported by:

Municipality of Valtetsi (DHMOS VALTETSIOU)
Prefecture of Arcadia (NOMARXIA ARKADIAS)
Municipality of Tripolis (DHMOS TRIPOLEOS)
Publications of the Astronomical Society of Australia (PASA)
Australia Telescope National Facility (ATNF)

Final workshop proceedings on PASA

Workshop proceedings progress

Workshop photos

Scientific Rationale

Recent work has identified the GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources as the most likely candidates for the progenitors of the large scale radio sources. The GPS and CSS sources are powerful but compact radio sources whose spectra are generally simple and convex with peaks near 1 GHz and 100 MHz respectively. 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).

Current models for the evolution of powerful radio galaxies suggest that these sources propagate from the 10 pc to Mpc scales at roughly constant velocity through an ambient medium which declines in density while the sources decline in radio luminosity. The observed number densities of powerful radio sources as a function of linear size (from tens of parsecs to hundreds of kpc) are consistent with such a scenario. Thus, 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.

Rapid progress has been made in our understanding of GPS and CSS sources through the combination of high resolution radio and optical imaging as well as IR and X-ray observations. This workshop will bring together observers from across the spectrum with theorists for an informal and stimulating exchange of ideas and results.

Workshop Location and Venue

This workshop is the third in a series following the 1990 meeting in Dwingeloo and the 1996 meeting in Leiden. However, here we break with tradition by holding the workshop outside of The Netherlands.

The workshop will be held in the Greek village of Kerastari, the birthplace of the LOC chair, Tasso Tzioumis. It is a tiny picturesque village, nestled in the mountains of ancient Arcadia near the town of Tripolis, in the Peloponese, the southern most part of Greece.

The venue is the village hall which can accommodate a limited number of people. Workshop participation will be limited to about 50-60 persons. A List of participants is maintained and continuously updated.

Further details including Maps and Photos are available here.

List of topics

A diverse range of topics is covered by the workshop. This can be seen in the List of presentations, which will be continuously updated as registration progresses.

Block Workshop Schedule

Tuesday 2002 May 28 Arrival. Registration and informal reception in Tripolis, Hotel Arcadia ~5-9pm.
Wednesday 2002 May 29 Full day workshop
Thursday 2002 May 30 Half day workshop; Local excursions; Conference dinner in the village
Friday 2002 May 31 Full day workshop
Saturday 2002 June 1 Possible full-day excursion(s)
Saturday 2002 June 1 Evening party in Kerastari, hosted by Tasso Tzioumis.

Important Dates

September 2001 1st announcement and pre-registrations begin.
Late March 2002 Final arrangements. 2nd announcement.
1 April 2002 Registration and hotel bookings open.
End April 2002 Hotel bookings close. Confirm attendance.
May 28, 2002 Arrival; registration; reception.
May 29-31, 2002 WORKSHOP
June 1, 2002 Post-workshop excursions; Party.
June 30, 2002 Final deadline for manuscripts

Workshop fees, payments and assistance

The registration fee has been set at E200 for non-students and E150 for students. It covers the informal reception, light breakfast, lunch and coffee/tea every workshop day, the conference dinner, daily bus transport and a copy of the workshop proceedings.

As the workshop is self-funding ALL participants are expected to pay registration, including invited speakers and LOC and SOC members.

In exceptional circumstances, some limited financial support to students may be possible. Please email directly to the organisers at

Registration payments will be accepted only at the workshop in cash and preferably in Euro. If this will cause undue hardship to anyone, please let us know.

Accommodation costs are not included and must be paid directly to the hotels by the participants. Details are given in the hotels list.

Money matters

The currency in Greece is now the Euro, and the old Drachmas have gone. Euro notes and coins from any other country are of course readily accepted.

Money exchange can be done at any bank and there are some branches at Athens airport. Tripolis has a number of banks (> 5) but they are only open at business hours. By far the best and easiest way to get local cash is to use the ATM wall machines. These are ubiquitous, supported by all major banks, accept almost all international credit/debit cards and there are many machines in town and at the airport.

Major credit cards are accepted by the more expensive establishments. For the hotels, information is given in the hotels list. The cheaper restaurants are unlikely to accept credit cards and you should rely more on having cash (Euro).

Meals in Greece are relatively inexpensive and can start as low as E5 in a local restaurant. Around E10-20 will be a very good dinner unless you go really upmarket or have expensive drinks.


Late spring to early summer is the best time of the year in Greece, as it is usually warm but not yet too hot. However, Tripolis and Kerastari are in the mountains and it can get cold, especially at night at any time.

Average temperatures for Tripolis in May-June are around 25 C maximum and down to about 10 C minimum, with an average precipitation of about 3cm (e.g. see It should be dry and warm but could also get hot (> 30 C) or cold (< 10C at night), so please do come prepared.

Facilities (projectors, phones, internet...)

A video projector for computer presentations and an overhead projector for transparencies will be available. If there are other requirements (e.g. slide projector), please let the LOC know asap, and we will endeavour to provide them.

A small photocopier and a PC printer will provide basic printing and copying facilities. More extensive services exist in Tripolis.

There are a few telephones in the village, including one in the Hall, one at Tasso's place plus a public cardphone. In addition, the village has phenomenal mobile coverage (GSM) due to line-of-sight towers in a nearby mountain. The hotels should also have phones in every room but these may be expensive. A fax machine may be provided if it is deemed necessary.

Internet access is relatively easily available. It is possible to dial in and this may be the best if you have global internet roaming and can use a local provider. However, the cheapest way is to use the local internet cafes and there are a few in Tripolis (mainly in bars). The LOC chair will also have dial in access in the village and this can be used for urgent messages.

Geoff Bicknell (Australia)
Wim De Vries (USA)
Carla Fanti (Italy)
Roberto Fanti (Italy)
Anton Koekemoer (USA)
Chris O'Dea (USA) -- Chair
Richard Schilizzi (Netherlands)
Ignas Snellen (UK)
Tasso Tzioumis (Australia)

Antonis Polatidis (Germany)
John Seiradakis (Greece)
Tasso Tzioumis (Australia) -- Chair

Register Here!






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