e-VLBI observations of GHz-Peaked Spectrum (GPS) radio sources in nearby galaxies from the AT20G survey

Abstract

GHz-peaked spectrum (GPS) radio sources are thought to be young objects which later evolve into FR-I and FR-II radio galaxies. We have used the Australia Telescope 20GHz (AT20G) survey catalogue to select a uniform sample of GPS sources with spectral peaks above 5GHz, which should represent the youngest members of this class. In this paper, we present e-VLBI observations of ten 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 4.8GHz with the Australia Telescope Long Baseline Array (LBA) using a real--time software correlator. All ten sources were detected, and were unresolved on scales of ~100mas, implying that they are typically less than 100pc in linear size.

7 pages, 7 figures, 3 tables

References in corpus (11)

• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• The 6dF Galaxy Survey: Samples, Observational Techniques and the First Data Release
• Radio sources in the 6dFGS: Local luminosity functions at 1.4 GHz for star-forming galaxies and radio-loud AGN
• DiFX: A software correlator for very long baseline interferometry using multi-processor computing environments
• The HIPASS Catalogue: III - Optical Counterparts & Isolated Dark Galaxies
• The properties of extragalactic radio sources selected at 20 GHz
• The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample
• A Complete Sample of Megaparsec Size Double Radio Sources from SUMSS
• Are young radio sources in equipartition?
• The extragalactic radio-source population at 95 GHz
• High Frequency GPS sources in the AT20G Survey

Cited by in corpus (9)

• Compact steep-spectrum and peaked-spectrum radio sources
• An unbiased sample of bright southern Compact Steep Spectrum and Gigahertz Peaked Spectrum Sources
• Observations and properties of candidate high frequency GPS radio sources in the AT20G survey
• Gamma-ray emission in radio galaxies under the VLBI scope -- I. Parsec-scale kinematics and high-energy properties of $\gamma$-ray detected TANAMI radio galaxies
• Compact jets dominate the continuum emission in low-luminosity active galactic nuclei
• The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (III)
• A decades-long fast-rise-exponential-decay flare in low-luminosity AGN NGC 7213
• High-resolution Observations of Low-luminosity Gigahertz-Peaked Spectrum and Compact Steep Spectrum Sources
• Unveiling the AGN in IC 883: discovery of a parsec-scale radio jet