Structure, spectra and variability of some GPS radio sources

Abstract

We report the results of multifrequency-VLBI observations of GHz-Peaked-Spectrum (GPS) radio sources. The VLBI structure and component spectra of some GPS sources are presented. Our VLBI results show that about 80% of the GPS galaxies exhibit a compact double or CSO-like structure, while the GPS quasars tend to show a core-jet. The component spectra of the GPS galaxies are often steep/convex, and the core has a flat spectrum but it is usually hidden or weak. In addition, we studied the variability of GPS sources by comparing new flux density measures, acquired with the Urumqi 25m telescope at 4.85 GHz, with previous 87GB data. The results show that 44% of the GPS quasars varied higher than 10% in passed 20 years, while the fraction is only 12% for the GPS galaxies meaning that the GPS quasars are much more variable than GPS galaxies. In total, 25% of GPS sources show >10% variability at 4.85 GHz in our sample.

4 pages, 7 figures

References in corpus (11)

• A complete sample of GHz-Peaked-Spectrum radio sources and its radio properties
• On the evolution of young radio-loud AGN
• High Frequency Peakers: young radio sources or flaring blazars?
• GPS radio sources: new optical observations and an updated master list
• VLBA observations of GHz-Peaked-Spectrum radio sources at 15 GHz
• A Parkes half-Jansky sample of GPS galaxies
• Complete identification of the Parkes half-Jansky sample of GHz peaked spectrum radio galaxies
• European VLBI Network observations of fourteen GHz-Peaked-Spectrum radio sources at 5 GHz
• VLBI observations of nineteen GHz-Peaked-Spectrum radio sources at 1.6 GHz
• EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4GHz
• A Search for Molecular Gas in GHz Peaked Spectrum Radio Sources

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