Institutional Repository of Radio Astronomy Research Laboratory
| Observations of IntraDay Variable sources with the Effelsberg and Urumqi Radio Telescopes | |
Marchili, N.1; Krichbaum, T. P.1; Liu, X.2 ; Song, H. G.2; Gabányi, K. É.3,4; Fuhrmann, L.1; Müller, P.1; Witzel, A.1; Zensus, J. A.1; Han, J. L.5
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| 2007-06-01 | |
| Conference Name | Bursts, Pulses and Flickering: Wide-Field Monitoring of the Dynamic Radio Sky |
| Source Publication | Bursts, Pulses and Flickering: Wide-Field Monitoring of the Dynamic Radio Sky |
| Volume | - |
| Issue | - |
| Pages | 19 |
| Conference Date | June 12-15 2007 |
| Conference Place | Kerastari, Tripolis, Greece |
| Country | Greece |
| Contribution Rank | 2 |
| Abstract | A sample of classical IntraDay Variable (IDV) and IDV candidate sources has been monitored with the Urumqi 25m telescope and the Effelsberg 100m telescope. Aim of the project is to investigate the origin of IntraDay Variability, a phenomenon which has been observed in about 30% of flat spectrum radio quasars. Simultaneous Effelsberg-Urumqi observations demonstrated that the Urumqi antenna, although relatively small in diameter, is well suitable for IDV experiments. A few Urumqi datasets, however, turned out to be affected by a spurious ˜ 24 hours modulation, an effect which has been removed by means of a new procedure for data reduction. In about 14 months, 12 epochs of observation have been collected, for a total observing time of more than 45 days. The epochs are regularly distributed over the whole year, in order to check for the presence of systematic annual changes in the variability time scales - a crucial test for verifying the consistency of source-extrinsic models of the variability. Preliminary time-analysis of the monitored sources revealed some hint for a slowing down of the characteristic time scales of S5 0716+714, a result that, if confirmed, would be compatible with a source-extrinsic origin of the variability, in contrast to previous IDV studies. No significant modulation of the time scales has been detected for S4 0954+658. Bursts, Pulses and Flickering:Wide-field monitoring of the dynamic radio sky June 12-15 2007 Kerastari, Tripolis, Greece |
| URL | 查看原文 |
| Indexed By | 其他 |
| Language | 英语 |
| Document Type | 会议论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/4161 |
| Collection | 射电天文研究室_星系宇宙学研究团组 科研仪器设备产出_利用南山26米射电望远镜（NSRT）观测数据的文章 |
| Affiliation | 1.Max-Planck-Institut für Radioastronomie, Bonn, Germany; 2.Urumqi Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Urumqi 830011, PR China; 3.HAS, Research Group for Geodesy and Geodynamics, Budapest, Hungary; 4.FÖMI, Satellite Geodetic Observatory, Penc, Hungary; 5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China |
| Recommended Citation GB/T 7714 | Marchili, N.,Krichbaum, T. P.,Liu, X.,et al. Observations of IntraDay Variable sources with the Effelsberg and Urumqi Radio Telescopes[C],2007:19. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Marchili-2007-Observ（508KB） | 会议论文 | 开放获取 | CC BY-NC-SA | View Application Full Text | ||
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