NASA/IPAC EXTRAGALACTIC DATABASE
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For refcode 1996AJ....111.2174M:
Retrieve 140 NED objects in this reference.
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1996AJ....111.2174M A 22 GHz VLBI SURVEY OF 140 COMPACT EXTRAGALACTIC RADIO SOURCES G. A. MOELLENBROCK Department of Physics, Brandeis University, P.O. Box 9110. Waltham, Massachusetts 02254 Electronic mail: gam@vlbi.astro.brandcis.edu K. FUJISAWA Institute of Space and Astronautical Science, 3-I-I Yoshinodai, Saganlihara, Kanagawa 229, Japan Electronic mail: kenta@vsop.isas.ac.jp R. A. PRESTON Jet Propulsion Laboratory, MS 238-332,4800 Oak Grove Drive, Pasadena, California 91109 Electronic mail: rap@logos.jpl.nasa.gov L. I. GURVITS Joint Institute for VLBI in Europe, P.O. Box 2,7990 AA, Dwingeloo, The Netherlands Electronic mail: lgurvits@nfra.nl R. J. DEWEY Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109 Electronic mail: rachel @pulsar.princeton.edu H. HIRABAYASHI Institute of Space and Astronautical Science, 3-I-I Yoshinodai, Sagamihara, Kanagawa 229, Japan Electronic mail: hirax@vsop.isas.ac.jp M. INOUE, S. KAMENO, AND M. KAWAGUCHI Nobeyama Radio Observatory, Minamimaki-mura, Minamisaku-gun, Nagano 384-13, Japan Electronic mail: inoue@nao.ac.jp, kameno@hotaka.mtk.nao.ac.jp, kawagu@vsop.isus.ac.jp T. IWATA Communications Research Laboratory, Kashima Space Center, 893-1, Hirai, Kashima, Ibaraki 314, Japan Electronic mail: iwat@crl.go.jp D. L. JAUNCEY AND V. MIGENES Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 2121, Australia Electronic mail: djauncey@thor.cbr.cossa.csiro.au, migenes@hotaka.mtk.nao.ac.jp D. H. ROBERTS Department of Physics, Brandeis University, P.O. Box 9110, Waltham, Massachusetts 02254 Electronic mail: dhr@vlbi.astro.brandeis.edu R. T. SCHILIZZI Joint Institute for VLBI in Europe, P.O. Box 2, 7990 AA, Dwingeloo, The Netherlands Electronic mail: rts@nfra.nl S. J. TINGAY Mount Stromlo and Siding Spring Observatories, Private Bag, Weston Creek, ACT 2611, Australia Electronic mail: tingay@mso.anu.edu.au Received 1996 March 5,. revised 1996 March 18 ABSTRACT A sample of 140 compact, flat- or inverted-spectrum ({alpha} > - 0.5, S_{nu} ~ {nu}^{alpha}^) extragalactic radio sources with {delta} > - 40^deg^ and total flux density S_{nu}_ >~ 1 Jy has been observed with VLBI at 22 GHz on baselines of 4,400-10,800 km (3.3 - 8.0 x 10^8^{lambda}) spanning the Pacific Ocean. Structural information on scales as small as ~150 {micro}as, in the form of brightness temperatures or lower limits, has been derived for the 136 sources that were detected. Twenty-one sources show evidence of structure with brightness temperature in the source frame greater than 10^12^ K. This survey was motivated by the needs of the Space VLBI missions VSOP and RadioAstron currently being prepared for launch. Among the 84 sources detected on baselines longer than 7.0 x 10^8^ {lambda}, 32 have fringe amplitudes greater than 1 Jy and 14 show evidence of structure with observed brightness temperature greater than 7.4 x 10^11^ K, the 7{sigma} detection threshold for a 1 Jy circular Gaussian source on a 25,000 km baseline between VSOP and a single VLBA antenna at 22 GHz. The data obtained in this ``Pre-Launch Survey" should prove useful not only for these and future space VLBI missions, but also for statistical studies of active galactic nuclei (AGN) and for planning millimeter-VLBI experiments. Of particular interest is the prominence in the survey results of the 21 AGN that have been detected in {gamma}-rays by CGRO/EGRET [Thompson et al. ApJS, 101, 259 (1995)].
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