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  • 1.
    Booth, R. S.
    et al.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, United Kingdom.
    Spencer, R. E.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, United Kingdom.
    Stannard, D.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, United Kingdom.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    High-resolution observations of quasars from the Parkes +/- 4 deg. sample1979In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 188, p. 159-163Article in journal (Refereed)
    Abstract [en]

    VLBI observations of 20 compact quasars have been made between Jodrell Bank and Onsala at a frequency of 1666 MHz. Twelve of the quasars have inverted or peaked spectra at centimetre wavelengths and these are all unresolved, having angular diameters of less than 0.015 arcsec. Two out of five quasars with overall flat spectra are partially resolved on this scale size, as are three steep-spectrum quasars.

  • 2.
    Stannard, D.
    et al.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, UK.
    Booth, R.S.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, UK.
    Spencer, R.E.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Cheshire, UK.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers Institute of Technology, Gothenburg, Sweden.
    VLBI Observations of 3C345 at 1.67 GHz1980In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 192, no 4, p. 555-560Article in journal (Refereed)
    Abstract [en]

    VLBI observations of the quasar 3C 345 suggest that the milliarcsec subcomponents in the core have approximately equal intensities at 1.67 GHz. A new compact feature is detected in the inner jet structure at a distance of ∼ 12 m.arcsec from the core. © 1980 Royal Astronomical Society. Provided by the NASA Astrophysics Data System

  • 3.
    Zhang, F. J.
    et al.
    University of Manchester, Nuffield Radio Astronomy Laboratories, Macclesfield, UK.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology.
    THE SUBMILLIARCSECOND RADIO STRUCTURES OF THE 2 BL LAC OBJECTS MKN421 AND 0735 + 1781991In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 248, no 3, p. 566-571Article in journal (Refereed)
    Abstract [en]

    Very high-resolution (approximately 0.15 mas) VLBI hybrid maps of the two BL Lac objects Mkn421 and 0735 + 178 have been produced at lambda-1.35 cm. The structures of both sources are simple. Only an unresolved core is found in Mkn421. It is magnetic field dominated, and the motion of relativistic electrons is strongly restrained by the magnetic field. Relativistic electrons with relatively low energy are responsible for the synchrotron radiation. The maps of 0735 + 178 show that the radio structure at lambda-1.35 cm is dominated by a strong core, and there is a weak component outside. We can put a lower limit to the angular velocity of the outer component (0.32 +/- 0.03) mas yr-1, corresponding to an apparent transverse speed of (5.4 +/- 0.6)c which tallies with previous results. The outer component has an extension towards the south-east, a tendency also seen in the 6-cm VLBI maps. With our 1.35-cm VLBI observations, we demonstrate that it is possible to study a new component emerging from its core during an outburst and to study its behaviour on its way out.

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