Proceedings of the 5th European VLBI Network Symposium

Proceedings of the 5th European VLBI Network Symposium (2000). held at Chalmers Technical University, June 29th - July 1st, 2000. Edited by: J.E. Conway, A.G. Polatidis, R.S. Booth and Y. Pihlström. Published Onsala Space Observatory. ISBN 91-631-0548-9

Above. Cover illustration: EVN VLBI observations of compact radio sources in the Hubble Deep Field and flanking fields. Acknowledgements .Garrett and collaborators. See Garrett et al p 137 for details.




List of Contributions

1. AGN Jet Observations
2. CSS and GPS sources
3. Extragalactic masers and spectral absorption
4. Galaxy Clusters
5. Weak extragalactic source surveys
6. Stabursts and supernovae
7. Stellar continuum
8. Galactic spectral line
9. Geodesy and astrometry
10. Technical developments


The 5th biennial symposium of the European VLBI Network, entitled EVN-2000 was organised by the VLBI group at Onsala Space Observatory. Meetings were held at the observatory and its parent University, Chalmers University of Technology, in Göteborg from June 29 - July 1, 2000. More than 80 astronomers attended the symposium, including many research students and new users of the Network; 15 different countries were represented. Many young participants were supported through the European Union's Framework and Access programmes. Onsala is the longest standing VLBI observatory in Europe, having performed the first transatlantic VLBI observations in 1968 and having a long record of VLBI measurements both in Astronomy and Geodesy. It was appropriate, therefore, that the symposium took place in its 50th year of operation.

The last EVN symposium saw the opening of the new EVN Correlator Centre at JIVE, in Dwingeloo, the Netherlands. This symposium contains reports on data processed with the new correlator, a new milestone for European VLBI. Another important milestone was also represented - Space VLBI or VLBI between the ground arrays and an antenna in space. The Japanese HALCA satellite-borne antenna has been operating with the EVN and global VLBI arrays at wavelengths of 6 and 18 cm and some of the results of those observations are presented here.

The range and variety of problems tackled by the VLBI technique are ever growing and today they encompass many branches of astrophysics and astronomy. Topics include AGN continuum observations with ever higher resolution via millimetre-wave and Space VLBI. Weak sources can now be imaged using the phase-referencing technique and whole new classes of astronomical object are now being regularly imaged for the first time at milli-arcsecond resolution. Targets include nearby radio stars and associated searches for low mass companions via astrometry; and evolving supernovae in external galaxies. Impressive movies of these evolving supernovae have been made. Also reported in these pages is deep imaging of the weak extragalactic radio source population in the Hubble Deep Field. These observations are beginning to probe the microjansky source population at milli-arcsecond resolution; and turning up examples of compact high-z starburst galaxies.

Spectral line measurements are on the increase and again address a fascinating variety of questions from star formation to accretion discs around black holes. This work is made possible by the presence of compact cosmic masers which can be used as tracers of dynamics. Exciting new results in Galactic astronomy concern rotating discs around putative protostars and the evolution of shells of SiO masers around pulsating Mira variables and infrared stars. In the extragalactic field water maser observations are giving more evidence for accretion discs around ten million solar mass black holes in Seyfert galaxies while measurements of red-shifted atomic hydrogen have revealed the atomic component of tori around AGN.

Closer to home VLBI is also used extensively in the service of geodesy. Geodetic VLBI provides unique information about Earth orientation and rotation and provides a high accuracy check on other geodetic techniques.

An atmosphere of friendliness and collaboration surrounded the conference as VLBI friends from the observatories at the different ends of the baselines mingled with the user community, some of whom have never been to a radio observatory. User-friendliness is important to the EVN - this meeting showed that we are well on the way to its implementation. Finally, I want to record my thanks to the editorial team who have worked hard to produce these proceedings in good time and also to thank those other people who contributed so much to the smooth running of the meeting - especially Margareta Mattsson, Lars Eriksson and Vivian Svensson.

Roy Booth

Director, Onsala Space Observatory, Sweden


The conference organisers gratefully acknowledge the support of the European Commission and its 5th Framework Programme (IHP - Infrastructure Cooperation Networks, contract number HPRI-CT-1999-40003). Funds from this contract made possible support for travel expenses for some of the participants and also helped support the publishing costs.

Michael Garrett (JIVE) and collaborators are thanked for providing the images that appear on the cover.

Table of Contents


The VSOP mission. (Invited) -- 1

Hirabayashi, H.

Slow jets in Seyfert Galaxies: NGC1068 -- 7

Roy, A.

III Zw 2: Superluminal motion and compact lobe expansion in a Seyfert galaxy. -- 11

Brunthaler, A., et al

Parsec-scale properties of a complete sample of radio galaxies -- 15

Venturi, T.

Probing the pc-scale environment of the powerful radio galaxy Hercules A -- 19

Gizani, N., et al

VLA, MERLIN and EVN observations of 3C264 at 1.6GHz -- 23

Lara. L., et al

From centimetre to millimetre wavelengths: A high angular resolution study of 3C273. (Invited) -- 25

Krichbaum, T.

VLBI observations of five compact radio sources -- 31

Zhou, J., et al

EVN and MERLIN observations of ON 231 after the great optical flare of spring 1998. -- 35

Mantovani, F., et al

VLBI and space VLBI of TeV gamma-ray sources -- 39

Edwards, P., et al

Space VLBI observations of the extremely distant quasars 0201+113 and 0537-286 -- 41

Frey, S., et al

Space VLBI observations reveal a parsec scale misalignment in the jet of 0458-020 -- 43

Paragi, Z., et al

Radio cores of Blazars -- 45

Venturi, T., et al

Nuclear structures in 2Jy radio sources -- 47

Venturi, T., et al

The core-jet structure of the JVAS gravitational lens B1030+074 -- 49

Xanthopoulos, E., et al

Polarisation measurements in VLBI (Invited) -- 53

Gabuzda, D.

Recent results on high frequency polarimetric VLBI observations of relativistic jets -- 59

Alberdi, A., et al

Transverse magnetic field structures in BL Lacertae objects -- 63

Pushkarev, A., et al

Polarimetric VLBI observations of 0735+178 -- 67

Agudo, I., et al

Global observations of the unique BL Lac object 0820+225 -- 71

Gabuzda, D., et al


Young radio sources (Invited) -- 73

Fanti, C.

Young radio-loud AGN: A new sample at low redshift -- 79

Snellen, I., et al

A method to measure structural changes in GHz-Peaked Spectrum radio galaxies. -- 83

Tschager, W., et al

Are CSOs host-galaxies undergoing merging? -- 87

Xiang, L., et al

Rotation measures in two CSSs -- 91

Saikia, D.J., et al

Polarisation limits in Compact Symmetric Objects -- 95

Peck, A. & Taylor, G.B.

Multi-wavelength analysis of the peculiar Compact Steep Symmetric source 3C99 -- 97

Ferrari,C., et al

Proper motion in OQ208 -- 99

Stanghellini, C., et al


Accretion and outflow in the Circinus AGN (Invited)
-- 101

Greenhill, L.

VLBA imaging of NGC 5793: parsec-scale jets and water maser emission -- 107

Hagiwara, Y., et al

HI absorption and the ISM around radio galaxies -- 111

Morganti, R., et al

EVN observations of a HI disk in the FRI radio galaxy NGC4261 --- 115

Pihlström, Y., et al

Global VLBI observations of HI absorption toward NGC 3894 --- 119

Peck, A. & Taylor G.B.

HI absorption in 3C236 -- 123

Conway, J.E. & Schilizzi R.T.

HI absorption and OH megamasers in IC694 -- 127

Polatidis, A.G., & Aalto S.


Magnetic fields in clusters of galaxies -- 131

Berzins, K.


High resolution radio imaging of the Hubble Deep and Flanking Fields -- 133

Muxlow, T.W.B., et al

AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field. -- 137

Garrett, M.A., et al


High angular resolution studies of starburst galaxies (Invited) -- 141

Pedlar, A.

Strong deceleration in the expansion of radio supernova SN1979C -- 147

Marcaide, J.

Synchrotron self-absorption in SN 1993J -- 151

Perez-Torres, M.A., et al


Stellar VLBI (Invited) -- 155

Lestrade, J-F.

The milliarcsecond radio structure of LS5039 -- 163

Paredes, J., et al

VLBI observations of single stars, spatial resolution and astrometry. -- 167

Pestalozzi, M., et al

EVN ad hoc observations of GRS1915+105 -- 171

Feretti, L., et al

EVN observations of the quiescent radio emission of HR1099 --173

Trigilio, C., et al


Methanol masers: tracers of discs? -- 175

Phillips, C.

Methanol masers: tracers of outflows? -- 179

Minier, V., et al

Preliminary results on water maser EVN observations and the collimation of protostellar outflows. -- 183

Desmurs, J-F., et al

OH masers and the structure of Mira/Red Supergiant winds -- 185

Richards, A.M.S., et al

Amplification of the stellar image by circumstellar OH masers -- 189

Vlemmings, W.

Simultaneous observatiosn of the two SiO maser transitions at 7mm using the VLBA -- 193

Yi, J., et al

Simulating VLBI observations of circumstellar SiO masers -- 197

Humphreys, E.M.L., et al

Anisotropic interstellar scattering of OH masers in W51 -- 201

Strom, R., et al

Modelling the 13.44 GHz masers in W3(OH) -- 205

Gray, M.


VLBI in the service of geodesy 1968-2000: An Onsala perspective (Invited) -- 209

Elgered, G. & Haas R.

Integrating GPS zenith path delay measurements into the analysis of VLBI observations on the European network -- 217

Rioja, M., et al

Space-VLBI phase-referencing -- 221

Guirado, J., et al

Detection of outer galactic rotation through phase-referencing VLBI astrometry with water masers -- 225

Hachisuka, K., et al

The complete S5 polar cap survey: en route to phase-delay global astrometry -- 229

Ros, E., et al

Studying the Milky Way galaxy with VERA (VLBI Exploration of Radio Astrometry) -- 231

Hachisuka, K., et al


Future directions in VLBI technology (Invited) -- 233

Whitney A.

The ``S3'' VLBI data record/playback system -- 239

Cannon, W.

The EVN MkIV data processor at JIVE -- 243

Campbell, R.M.

The first VLBI observations with the Ventspils 32m radio telescope under the LFVN project. -- 247

Shmeld, I., et al

A new method to detect/confirm weak structural changes with VLBI -- 249

Jin, C., et al

Low frequency radio imaging of radio sources -- 251

Likhachev, S., et al

File translated from TEX by TTH, version 2.70.
On 10 Feb 2001, 09:08.