High Frequency GPS sources in the AT20G Survey

Abstract

The Australia Telescope 20GHz (AT20G) survey was used to select a complete sample of 656 Gigahertz Peaked Spectrum (GPS) sources with spectral turnovers above 5GHz. The AT20G has near simultaneous observations at 4.8, 8.6 and 20GHz, which makes it possible to exclude flat spectrum variability as a cause of a source's peaked spectrum. Optical identification of the sample results in 361 QSOs and 104 galaxies and 191 blank fields. Redshifts are known for 104 of the GPS sources. The GPS sources from the AT20G are discussed and compared to previously known samples. The new sample of high frequency peaking GPS sources is found at a lower redshift than previous samples and to also have a lower 5GHz radio power. Evidence is found to support the idea that the origin of the GPS spectral shape are intrinsically different for galaxies and QSOs. This paper is an elaboration and extension of the talk given at the $4^{th}$ CSS/GPS conference in Riccione in May 2008.

4 pages, 4 figures, proceedings from the 4th CSS/GPS conference

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• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• The SuperCOSMOS Sky Survey. Paper I: Introduction and Description
• The 6dF Galaxy Survey: Samples, Observational Techniques and the First Data Release
• The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample
• A new sample of faint Gigahertz Peaked Spectrum radio sources
• GPS radio sources: new optical observations and an updated master list
• The extragalactic radio-source population at 95 GHz

Cited by in corpus (6)

• Compact steep-spectrum and peaked-spectrum radio sources
• The local radio-galaxy population at 20 GHz
• Infrared-Faint Radio Sources: A New Population of High-redshift Radio Galaxies
• Parsec-scale morphology and spectral index distribution in faint high frequency peakers
• e-VLBI observations of GHz-Peaked Spectrum (GPS) radio sources in nearby galaxies from the AT20G survey
• Searching for Radio Transients with Inverted Spectra in Epoch 1 of VLASS and VCSS, and Identification of a Sample of Candidate Relativistic Nuclear Transients