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Sökning: WFRF:(Tang B.) > Högskolan i Halmstad

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1.
  • Tang, G., et al. (författare)
  • Radio source structure from geodetic VLBI observations : evolution of the quasar 3C 345 at 8 GHz
  • 1989
  • Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361 .- 1432-0746. ; 216:1-2, s. 31-38
  • Tidskriftsartikel (refereegranskat)abstract
    • Eight VLBI maps of 3C 345 were obtained at 8.3 GHz between 1980 and 1986. During this period, the two jet components C4 and C5 were shown to emerge from the core in succession and to move superluminally toward the west with angular velocities of 0.17 + or - 0.5 and 0.11 + or - 0.02 mas/yr, respectively. An emission detected between D and C5 after 1985.46 suggests that a new component emerged from the core, moving at an angular velocity of 0.2 mas/yr. The C3 component retained a velocity of about 0.44 mas/yr, and its proper motion was found to accelerate in the y-direction and decelerate in the x-direction.
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2.
  • Tang, Guoquiang, et al. (författare)
  • Radio source structure from geodetic VLBI observations : 8 GHz multi-epoch maps of the quasar 4C 39.25
  • 1987
  • Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361 .- 1432-0746. ; 185:1-2, s. 87-93
  • Tidskriftsartikel (refereegranskat)abstract
    • Techniques for estimating and/or eliminating the effects of structure variations in the extragalactic radio sources used as fiducial points in 8.3-GHz geodetic VLBI observations are described and demonstrated. Particular attention is given to the data base statistics, the calibration of visibility data, the production of hybrid maps with AIPS, and the implementation of these steps in a software package. A set of X-band maps of 4C 39.25, obtained with the receivers of the Mark III dual-frequency VLBI network at six epochs during 1980-1985, is presented. Such maps are shown to be of value (1) for maintaining submarcsec accuracy in the extragalactic reference frame and (2) for qualitative astronomical monitoring of the sources. In 4C 39.25, for example, apparent superluminal motions, complex internal kinematics, and a double western component are observed.
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3.
  • Tang, G., et al. (författare)
  • Recent Evolution of Jet Components in 3C345 at 3.6 cm
  • 1990
  • Ingår i: Parsec-Scale radio jets. - Cambridge : Cambridge University Press. - 0521392268 ; , s. 32-37
  • Bokkapitel (refereegranskat)abstract
    • A series of 3.6 cm VLBI maps of 3C345 (1980.79 to 1988.38) is presented. The evolution of the jet components in this quasar is briefly discussed. Recent behavior of component C5 is described and the presence of a new component, tentatively labeled C6, is suggested.
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  • Resultat 1-3 av 3
Typ av publikation
tidskriftsartikel (2)
bokkapitel (1)
Typ av innehåll
refereegranskat (3)
Författare/redaktör
Bååth, L.B. 1948- (3)
Tang, G (2)
Rönnäng, B., 1940- (2)
Bartel, N. (1)
Shapiro, I.I. (1)
Rönnäng, B.O. 1940- (1)
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Ratner, M. I. (1)
Tang, Guoquiang (1)
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Engelska (3)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (3)

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