Ojha, RoopeshFey, Alan L.Johnston, Kenneth J.Tzioumis, Anastasios K.Reynolds, John E.2020-05-112020-05-112004-04-01Roopesh Ojha et al., VLBI Observations of the Gigahertz-Peaked Spectrum Galaxy PKS 1934−638, The Astronomical Journal, Volume 127, Number 4, doi: https://doi.org/10.1086%2F382724https://doi.org/10.1086%2F382724http://hdl.handle.net/11603/18534http://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2004AJ....127.1977Ohttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2004AJ....127.1977OWe present 8.4 GHz VLBI observations of the gigahertz-peaked spectrum source PKS 1934-638 made with the Australian Long Baseline Array. Our observations confirm the compact double nature of the source and yield measured separations of 42.7 ± 0.4 mas at epoch 2002 July and 42.6 ± 0.3 mas at epoch 2002 November, which, when combined with previous observations, yield a rate of separation of 23 ± 10 μas yr⁻¹. This result suggests that over a timescale of 32.1 yr, the separation of the two components has changed marginally. Nominally, this provides support to the emerging consensus that compact symmetric objects (CSOs) are young sources. Our measurement of hot spot separation has, to our knowledge, the longest temporal coverage for a CSO reported in the literature.5 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Public Domain Mark 1.0This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. LawText