e-VLBI observations of GHz-peaked spectrum radio sources in nearby galaxies from the AT20G survey |
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| Authors: | Paul J Hancock Steven J Tingay Elaine M Sadler Chris Phillips Adam T Deller |
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| Institution: | Sydney Insitute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia;Department of Imaging and Ap Physics, Curtin University of Technology, GPO Box U1987, Perth WA 6102, Australia;Australia Telescope National Facility, CSIRO, PO Box 76, Epping NSW 1710, Australia;Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn VIC 3122, Australia |
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| Abstract: | Gigahertz-peaked spectrum (GPS) radio sources are thought to be young objects which later evolve into Fanaro–Riley type I (FR I) and FR II radio galaxies. We have used the Australia Telescope 20 GHz (AT20G) survey catalogue to select a uniform sample of GPS sources with spectral peaks above 5 GHz, which should represent the youngest members of this class. In this paper, we present e-VLBI observations of 10 such objects which are associated with nearby ( z < 0.15) galaxies and so represent a new population of local, low-power GPS sources. Our e-VLBI observations were carried out at 4.8 GHz with the Australia Telescope Long Baseline Array (LBA) using a real-time software correlator. All 10 sources were detected, and were unresolved on scales of ～100 mas, implying that they are typically less than 100 pc in linear size. |
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| Keywords: | instrumentation: interferometers galaxies: active galaxies: evolution radio continuum: galaxies |
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