An accelerated jet in DA193?

Details An accelerated jet in DA193? An accelerated jet in DA193?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...380..123w&link_type=abstract

Astronomy and Astrophysics, v.380, p.123-129 (2001)

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Jets, Galaxies: Quasars: General, Galaxies: Quasars: Individual: \Object{Da193

Scientific paper

% 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 q0=0.5, H0=100 km s-1Mpc-1 will be used.

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