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Date and Time of the Query: 2019-06-25 T12:36:47 PDT
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For refcode 2001A&A...380..123W:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...380..123W An accelerated jet in DA193? W. H. Wang, X. Y. Hong, D. R. Jiang, T. Venturi, Y. J. Chen and T. An Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, PR China National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China Institutor di Radioastronomia del CNR, Via P. Gobetti 101, 40129 Bologna, Italy Received 14 August 2001/Accepted 10 October 2001 Abstract. We present four epoch images with milliarcsecond resolution, from VLBI (Very Long Baseline Interferometry) observations of the quasar DA193 (J0555+3948) at 5GHz. The model-fitting results show that the source is resolved with a core-jet structure. A proper motion of 0.105 +/- 0.02 mas yr^-1^ of the jet component was estimated, which corresponds to an apparent velocity of 4.5 +/- 0.86 h^-1^ c at its redshift of z = 2.365. Estimates of the Doppler factor and of the brightness temperature confirm that this source is considerably boosted towards the line of sight. The velocity is about 4 times larger than previous estimates, which may indicate (1) that the jet component is being accelerated, possibly due to a bending jet aligned close to the line of sight; or (2) that there are two different components ejected in two flares. The possibility that multiple ejection of short-lived components is taking place in the core region of DA193 is also presented. Throughout this paper, the values q_0_ = 0.5, H_0_ = 100 km s^-1^ Mpc^-1^ will be used. Key words: galaxies: jets - galaxies: quasars: general - galaxies: quasars: individual: DA193
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