Institutional Repository of Radio Astronomy Research Laboratory
| EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4 GHz | |
Xiang, L1 ; Dallacasa, D2,4; Cassaro, P3; Jiang, D5; Reynolds, C6
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| 2005-04-01 | |
| Source Publication | ASTRONOMY & ASTROPHYSICS
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| Volume | 434Issue:1Pages:123-132 |
| Abstract | We present results of EVN observations of eleven GHz- Peaked- Spectrum ( GPS) radio sources at 2.3/ 8.4 GHz. These sources are from the classical " bright" GPS source samples with peak flux densities > 0.2 Jy and spectral indices alpha < - 0.2 ( S proportional to nu(-alpha)) in the optically thick regime of their convex spectra. Most of the target sources did not have VLBI images at the time this project started. The aim of the work is to find Compact Symmetric Object ( CSO) candidates from the " bright" GPS samples. These CSOs play a key role in understanding the very early stage of the evolution of individual radio galaxies. The reason for investigating GPS source samples is that CSO candidates are more frequently found among this class of radio sources. In fact both classes, GPS and CSO, represent a small fraction of the flux limited and flat- spectrum samples like PR+ CJ1 ( PR: Pearson- Readhead survey, CJ1: the first Caltech- Jodrell Bank survey) and CJF ( the Caltech- Jodrell Bank flat spectrum source survey) with a single digit percentage progressively decreasing with decreasing flux density limit. Our results, with at least 3, but possibly more CSO sources detected among a sample of 11, underline the effectiveness of our approach. The three confirmed CSO sources ( 1133+ 432, 1824+ 271, and 2121- 014) are characterized by a symmetric pair of resolved components, each with steep spectral indices. Five further sources ( 0144+ 209, 0554- 026, 0904+ 039, 0914+ 114 and 2322- 040) can be considered likely CSO candidates. The remaining three sources ( 0159+ 839, 0602+ 780 and 0802+ 212) are either of core- jet type or dominated by a single component at both frequencies. |
| Keyword | Galaxies : Nuclei Galaxies : Quasars : General Radio Continuum : Galaxies |
| Subtype | Article |
| DOI | 10.1051/0004-6361:20041778 |
| WOS Headings | Science & Technology ; Physical Sciences |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | COMPACT SYMMETRIC OBJECTS ; MULTIFREQUENCY VLA OBSERVATIONS ; B3-VLA CSS SAMPLE ; BANK VLBI SURVEY ; STEEP-SPECTRUM ; OPTICAL-IDENTIFICATION ; HOST GALAXIES ; YOUNG ; JETS ; SPECTROSCOPY |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000228097300015 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/811 |
| Collection | 射电天文研究室_星系宇宙学研究团组 射电天文研究室 |
| Corresponding Author | Xiang, L |
| Affiliation | 1.Chinese Acad Sci, Natl Astron Observ, Urumqi 830011, Peoples R China 2.Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy 3.CNR, Ist Radioastron, I-96017 Noto SR, Italy 4.CNR, Ist Radioastron, I-40129 Bologna, Italy 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 6.Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Corresponding Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Xiang, L,Dallacasa, D,Cassaro, P,et al. EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4 GHz[J]. ASTRONOMY & ASTROPHYSICS,2005,434(1):123-132. |
| APA | Xiang, L,Dallacasa, D,Cassaro, P,Jiang, D,&Reynolds, C.(2005).EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4 GHz.ASTRONOMY & ASTROPHYSICS,434(1),123-132. |
| MLA | Xiang, L,et al."EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4 GHz".ASTRONOMY & ASTROPHYSICS 434.1(2005):123-132. |
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| EVN observations of （439KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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