e-VLBI observations of GHz-peaked spectrum radio sources in nearby galaxies from the AT20G survey

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Title: e-VLBI observations of GHz-peaked spectrum radio sources in nearby galaxies from the AT20G survey
Author(s): Hancock, P. J.; Tingay, Steven J.; Sadler, Elaine M.; Phillips, Chris J.; Deller, Adam T.
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 youngestmembers 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.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
Source: Monthly Notices of the Royal Astronomical Society, Vol. 397, no. 4 (Aug 2009), pp. 2030-2036
Publication year: 2009
FOR Code(s): 0201 Astronomical and Space Sciences
Keyword(s): Evolution; Galaxies; Gigahertz-peaked spectrum; Interferometers; Radio continuum
Publisher: Wiley-Blackwell Publishing
ISSN: 0035-8711
Publisher URL: http://dx.doi.org/10.1111/j.1365-2966.2009.15055.x
Peer reviewed