VLBA observations of z > 4 radio-loud quasars

Details VLBA observations of z > 4 radio-loud quasars VLBA observations of z > 4 radio-loud quasars

2003-11-07

arxiv.org/abs/astro-ph/0311192v1

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures. To appear in the February issue of the Astronomical Journal

Scientific paper

10.1086/381300

We present high resolution (< 20 mas) observations of the radio continuum emission at 1.4 GHz from three high-redshift quasars: J1053-0016 (z=4.29), 1235-0003 (z=4.69), and J0913+5919 (z=5.11), thereby doubling the number of z > 4 radio-loud quasars that have been imaged at mas resolution. The observations were carried out with the Very Long Baseline Array (VLBA) of the NRAO. All three sources are unresolved in these observations, with source size limits of a few mas. In all cases the flux densities measured by the VLBA are within 10% of those measured with the VLA, implying that the sources are not highly variable on yearly timescales. We find no indication for multiple images that might be produced by strong gravitational lensing on scales from 20 mas (VLBA) to a few arcseconds (VLA), to dynamic range limits of ~100.

Affiliated with

Also associated with

No associations

Rating

VLBA observations of z > 4 radio-loud quasars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with VLBA observations of z > 4 radio-loud quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLBA observations of z > 4 radio-loud quasars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-603503