Overview and initial results of the very long baseline interferometry space observatory programme

High angular resolution images of extragalactic radio sources are being made with the Highly Advanced Laboratory for Communications and Astronomy (HALCA) satellite and ground-based radio telescopes as part of the Very Long Baseline Interferometry (VLBI) Space Observatory Programme (VSOP). VSOP observations at 1.6 and 5 gigahertz of the milli-arc-second-scale structure of radio quasars enable the quasar core size and the corresponding brightness temperature to be determined, and they enable the motions of jet components that are close to the core to be studied. Here, VSOP images of the gamma-ray source 1156+295, the quasar 1548+056, the ultraluminous quasar 0014+813, and the superluminal quasar 0212+735 are presented and discussed.

[1]  J. Anton Zensus,et al.  PARSEC-SCALE JETS IN EXTRAGALACTIC RADIO SOURCES1 , 1997 .

[2]  D. H. Roberts,et al.  A 22 GHz VLBI Survey of 140 Compact Extragalactic Radio Sources , 1996 .

[3]  D. R. Henstock,et al.  The second Caltech-Jodrell Bank VLBI survey. 1: Observations of 91 of 193 sources , 1994 .

[4]  笹隈 哲夫.  VLBI technology : progress and future observational possibilities : proceedings of the International Symposium, held at Kyoto International Conference Hall on September 6-10, 1993 , 1994 .

[5]  P. Charlot.  Fourteen extragalactic radio sources mapped at 2.3 and 8.4 GHz with a 24-hour Crustal Dynamics Program VLBI experiment , 1990 .

[6]  A. Readhead,et al.  The milliarcsecond structure of a complete sample of radio sources. II: First-epoch maps at 5 GHz , 1988 .

[7]  M. Schmidt.  Erratum: Optical Spectra and Redshifts of 4c Quasi-Stellar Radio Sources , 1975 .

[8]  Patrick Charlot,et al.  VLBA Observations of Radio Reference Frame Sources. II. Source Classification Based on Intrinsic Structure , 1996 .

[9]  C. H. Ottenhoff,et al.  VLBI Using a Telescope in Earth Orbit. II. Brightness Temperatures Exceeding the Inverse Compton Limit , 1989 .

[10]  C. Lawrence,et al.  New redshifts of strong radio sources , 1986 .

[11]  A. Marscher,et al.  Multifrequency VLA, VLBI, and Single-Dish Observations of the Quasar 4C 39.25 , 1991 .

[12]  J. A. Zensus,et al.  Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei , 1998 .

[13]  V. Dhawan,et al.  Structure and evolution of the compact radio source in NGC 1275. , 1995, Proceedings of the National Academy of Sciences of the United States of America.

[14]  B. Piner,et al.  A Slower Superluminal Velocity for the Quasar 1156+295 , 1997, astro-ph/9706157.

[15]  Kenneth I. Kellermann,et al.  The Spectra of Opaque Radio Sources , 1969 .