MILLIARCSECOND STRUCTURES OF EXTREMELY DISTANT QUASARS - 0336-017, 0636+680, 1442+101, AND 2048+312

LI GURVITS*, RT SCHILIZZI, PD BARTHEL, NS KARDASHEV, KI KELLERMANN, AP LOBANOV, IIK PAULINYTOTH, MV POPOV

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    We present the results of a continuing study of the milliarcsecond 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 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 q(o), using these and earlier data (Gurvits et al. 1992) is shown.

    Original languageEnglish
    Pages (from-to)737-742
    Number of pages6
    JournalAstronomy & astrophysics
    Volume291
    Issue number3
    Publication statusPublished - Nov-1994

    Keywords

    • QUASARS, Q 0336-017, Q 0636+680, Q 1442+101, Q 2048+312
    • GALAXIES, JETS
    • COSMOLOGY, OBSERVATIONS
    • SPECTRUM RADIO-SOURCES
    • COMPLETE SAMPLE
    • REDSHIFT
    • MAPS
    • GHZ

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