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Daily observations of interstellar scintillation in PSR B0329+54
Wang, N.1; Yan, Z.1,3; Manchester, R. N.2; Wang, H. X.1
2008-04-11
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号385期号:3页码:1393-1401
摘要Quasi-continuous observations of PSR B03239+54 over 20 d using the Nanshan 25-m telescope at 1540 MHz have been used to study the effects of refractive scintillation on the pulsar flux density and diffractive scintillation properties. Dynamic spectra were obtained from data sets of 90 min duration and diffractive parameters derived from a two-dimensional auto-correlation analysis. Secondary spectra were also computed but these showed no significant evidence for arc structure. Cross-correlations between variations in the derived parameters were much lower than predicted by thin-screen models and in one case was of opposite sign to the prediction. Observed modulation indices were larger than predicted by thin-screen models with a Kolmogorov fluctuation spectrum. Structure functions were computed for the flux density, diffractive time-scale and decorrelation bandwidth. These indicated a refractive time-scale of 8 +/- 2 h, much shorter than predicted by the thin-screen model. The measured structure function slope of 0.4 +/- 0.2 is also inconsistent with scattering by a single thin screen for which a slope of 2.0 is expected. All observations are consistent with scattering by an extended medium having a Kolmogorov fluctuation spectrum which is concentrated towards the pulsar. This interpretation is also consistent with recent observations of multiple diffuse scintillation arcs for this pulsar.
关键词Pulsars : Individual : Psr b0329+54 Ism : Structure
DOI10.1111/j.1365-2966.2008.12864.x
收录类别SCI
语种英语
WOS记录号WOS:000254604600021
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8365
专题光学天文研究部
作者单位1.NAOC, Urumqi Observ, Urumqi 830011, Xinjiang, Peoples R China
2.CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
3.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Wang, N.,Yan, Z.,Manchester, R. N.,et al. Daily observations of interstellar scintillation in PSR B0329+54[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,385(3):1393-1401.
APA Wang, N.,Yan, Z.,Manchester, R. N.,&Wang, H. X..(2008).Daily observations of interstellar scintillation in PSR B0329+54.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,385(3),1393-1401.
MLA Wang, N.,et al."Daily observations of interstellar scintillation in PSR B0329+54".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 385.3(2008):1393-1401.
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