On the nature of bright compact radio sources at z > 4.5
文献类型：期刊论文
| 作者 | Coppejans, Rocco1; Frey, Sandor2; Cseh, David1; Mueller, Cornelia1; Paragi, Zsolt3; Falcke, Heino1,4; Gabanyi, Krisztina E.2,5; Gurvits, Leonid I.3,6; An, Tao7,8; Titov, Oleg9 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2016-12-01 |
| 卷号 | 463期号:3页码:3260-3275 |
| ISSN号 | 0035-8711 |
| 关键词 | galaxies: active galaxies: high-redshift radio continuum: galaxies |
| DOI | 10.1093/mnras/stw2236 |
| 通讯作者 | Coppejans, Rocco(rocco.coppejans@gmail.com) |
| 英文摘要 | High-redshift radio-loud quasars are used to, among other things, test the predictions of cosmological models, set constraints on black hole growth in the early Universe and understand galaxy evolution. Prior to this paper, 20 extragalactic radio sources at redshifts above 4.5 have been imaged with very long baseline interferometry (VLBI). Here, we report on observations of an additional ten z > 4.5 sources at 1.7 and 5 GHz with the European VLBI Network, thereby increasing the number of imaged sources by 50 per cent. Combining our newly observed sources with those from the literature, we create a substantial sample of 30 z > 4.5 VLBI sources, allowing us to study the nature of these objects. Using spectral indices, variability and brightness temperatures, we conclude that of the 27 sources with sufficient information to classify, the radio emission from one source is from star formation, 13 are flat-spectrum radio quasars and 13 are steep-spectrum sources. We also argue that the steep-spectrum sources are off-axis (unbeamed) radio sources with rest-frame self-absorption peaks at or below GHz frequencies and that these sources can be classified as gigahertz peaked-spectrum and megahertz peaked-spectrum sources. |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; VLBA CALIBRATOR SURVEY ; HIGH-REDSHIFT QUASARS ; SCINTILLATION-INDUCED VARIABILITY ; CELESTIAL REFERENCE FRAME ; DIGITAL SKY SURVEY ; STARBURST GALAXIES ; INFRARED GALAXIES ; SPECTRUM SOURCES ; STEEP-SPECTRUM |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000393566000078 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23282]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Coppejans, Rocco |
| 作者单位 | 1.Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands 2.FOMI Satellite Geodet Observ, POB 585, H-1592 Budapest, Hungary 3.Joint Inst VLBI ERIC, Postbus 2, NL-7990 AA Dwingeloo, Netherlands 4.Netherlands Inst Radio Astron ASTRON, POB 2, NL-7990 AA Dwingeloo, Netherlands 5.MTA Res Ctr Astron & Earth Sci, Konkoly Observ, POB 67, H-1525 Budapest, Hungary 6.Delft Univ Technol, Dept Astrodynam & Space Missions, NL-2629 HS Delft, Netherlands 7.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 8.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 9.Geosci Australia, POB 378, Canberra, ACT 2601, Australia |
| 推荐引用方式 GB/T 7714 | Coppejans, Rocco,Frey, Sandor,Cseh, David,et al. On the nature of bright compact radio sources at z > 4.5[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(3):3260-3275. |
| APA | Coppejans, Rocco.,Frey, Sandor.,Cseh, David.,Mueller, Cornelia.,Paragi, Zsolt.,...&Titov, Oleg.(2016).On the nature of bright compact radio sources at z > 4.5.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(3),3260-3275. |
| MLA | Coppejans, Rocco,et al."On the nature of bright compact radio sources at z > 4.5".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.3(2016):3260-3275. |
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来源：紫金山天文台
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