Lister, M. L. and Aller, H. D. and Aller, M. F. and Cohen, M. H. and Homan, D. C. and Kadler, M. and Kellermann, K. I. and Kovalev, Y. Y. and Ros, E. and Savolainen, T. and Zensus, J. A. and Vermeulen, R. C. (2009) Mojave : monitoring of jets in active galactic nuclei with VLBA experiments. V. Multi-epoch VLBA images. Astronomical Journal, 137 (3). pp. 3718-3729. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20090413-090043138
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We present images from a long-term program (MOJAVE: Monitoring of Jets in active galactic nuclei (AGNs) with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena associated with bright radio-loud active galaxies in the northern sky. The observations consist of 2424 15 GHz Very Long Baseline Array (VLBA) images of a complete flux-density-limited sample of 135 AGNs above declination –20°, spanning the period 1994 August to 2007 September. These data were acquired as part of the MOJAVE and 2 cm Survey programs, and from the VLBA archive. The sample-selection criteria are based on multi-epoch parsec-scale (VLBA) flux density, and heavily favor highly variable and compact blazars. The sample includes nearly all the most prominent blazars in the northern sky, and is well suited for statistical analysis and comparison with studies at other wavelengths. Our multi-epoch and stacked-epoch images show 94% of the sample to have apparent one-sided jet morphologies, most likely due to the effects of relativistic beaming. Of the remaining sources, five have two-sided parsec-scale jets, and three are effectively unresolved by the VLBA at 15 GHz, with essentially all of the flux density contained within a few tenths of a milliarcsecond.
|Additional Information:||© 2009 The American Astronomical Society. Received 2008 October 24; accepted 2008 December 18; published 2009 February 25. The authors acknowledge the other members of the MOJAVE team and students who have contributed to this work, including Christian Fromm, Kirill Sokolovsky, and Alexander Pushkarev at MPIfR as well as Andrew Merrill, Nick Mellott, Kevin O’Brien, and Amy Lankey at Purdue University. M.L.L. has been supported under NSF grants AST-0406923 & AST- 0807860, and a grant from the Purdue Research Foundation. Part of this work was done by M.L.L., D.C.H., and Y.Y.K. during their Jansky fellowships at the NRAO and also by Y.Y.K. and T.S. during their Alexander von Humboldt fellowships at the MPIfR. M.K. has been supported in part by the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. RATAN-600 observations are partly supported by the Russian Foundation for Basic Research (projects 01-02-16812, 05-02-17377, 08-02-00545). T.S. has been also supported in part by the Max-Planck-Gesellschaft and by the Academy of Finland grant 120516. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has also made use of the following resources: the University of Michigan Radio Astronomy Observatory, which is supported by the National Science Foundation and by funds from the University of Michigan, NASA’s Astrophysics Data System, and the NASA/IPAC Extragalactic Database (NED). The latter is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.|
|Subject Keywords:||BL Lacertae objects: general; galaxies: active; galaxies: jets; quasars: general; radio continuum: galaxies; surveys|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||10 Jul 2009 16:22|
|Last Modified:||26 Dec 2012 10:57|
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