Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..737g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 737-742
Astronomy and Astrophysics
Astronomy
15
Cosmology, Galactic Structure, Quasars, Radio Astronomy, Radio Jets (Astronomy), Red Shift, Angular Resolution, Data Reduction, High Resolution, Radio Spectra, Very Long Base Interferometry
Scientific paper
We present the results of a continuing study of the miliarcsecond structure of extremely high-redshift radio sources aimed at investigating possible cosmological evolutionary effects in quasars and their use in testing cosmological models. We present very long baseline interferometry (VLBI) maps of four quasars at redshifts z greater than or equal to 3: 0336-017 (z = 3.197), 0636+680 (z = 3.174), 1442+101 (z = 3.531), and 2048+312 (z = 3.185). All four sources are resolved. Two, 0636+680 and 1442+101, show well defined jets, while the other two are slightly extended and may contain jets. A means of estimating the cosmological deceleration parameter q0 using these and earlier data (Gurvits et al. 1992) is shown.
Barthel Peter D.
Gurvits Leonid I.
Kardashev Nikolai S.
Kellermann Kenneth I.
Lobanov Andrei P.
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