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Structure, spectra and variability of some GPS radio sources
X.Liu1; H.-G.Song1; L.Cui1,2
Conference Name4th Workshop on Compact Steep Spectrum and Gigahertz-Peaked Spectrum Radio Sources
Conference Date2008-05-26
Conference PlaceRiccione, ITALY
Publication PlaceWEINHEIM, GERMANY
Contribution Rank1

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, white 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 25-m 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.

Funding OrganizationINAF Istituto di Radioastronomia ; INAF Istituto di Radioastronomia
KeywordGalaxies: Nuclei Quasars: General Radio Continuum: Galaxies
Subject Area星系和宇宙学
Funding Project星系宇宙学研究团组
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Corresponding AuthorX.Liu
Affiliation1.National Astronomical Observatories/Urumqi observatory, CAS, 40-5 South Beijing Rd, Urumqi 830011, PR China
2.Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
X.Liu,H.-G.Song,L.Cui. Structure, spectra and variability of some GPS radio sources[C]. WEINHEIM, GERMANY:WILEY-VCH VERLAG GMBH,2009:145-148.
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