Long-term scintillation observations of five pulsars at 1540 MHz

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 脉冲星研究团组

	Long-term scintillation observations of five pulsars at 1540 MHz
	Wang, N; Manchester, RN ; Johnston, S ; Rickett, B ; Zhang, J; Yusup, A; Chen, M
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2005-03-21
卷号	358 期号:1 页码:270-282
关键词	ISM : general ISM : structure pulsars : general
ISSN号	0035-8711
通讯作者	na.wang@xao.ac.cn
英文摘要	From 2001 January to 2002 June, we monitored PSRs B0329+54, B0823+26, B1929+10, B2020+28 and B2021+51 using the Nanshan 25-m radio telescope of the Urumqi Observatory to study their diffractive interstellar scintillation (DISS). The average interval between observations was about 9 d and the observation duration ranged between 2 and 6 h depending on the pulsar. Wide variations in the DISS parameters were observed over the 18-month data span. Despite this, the average scintillation velocities are in excellent agreement with the proper motion velocities. The average two-dimensional autocorrelation function for PSR B0329+54 is well described by a thin-screen Kolmogorov model, at least along the time and frequency axes. Observed modulation indices for the DISS time-scale and bandwidth and the pulsar flux density are greater than values predicted for a Kolmogorov spectrum of electron density fluctuations. Correlated variations over times that are long compared to the nominal refractive scintillation time are observed, suggesting that larger scale density fluctuations are important. For these pulsars, the scintillation bandwidth as a function of frequency has a power-law index (similar to 3.6) much less than that expected for Kolmogorov turbulence (similar to 4.4). Sloping fringes are commonly observed in the dynamic spectra, especially for PSR B0329+54. The detected range of fringe slopes are limited by our observing resolution. Our observations are sensitive to larger-scale fringes and hence smaller refractive angles, corresponding to the central part of the scattering disc.
学科主题	致密天体、高能和基础物理
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	REFRACTIVE INTERSTELLAR SCINTILLATION ; DENSITY FLUCTUATIONS ; SPACE VELOCITIES ; PLASMA-DENSITY ; RADIO PULSARS ; PSR B0329+54 ; SPECTRUM ; SCATTERING ; TURBULENCE ; FREQUENCY
收录类别	SCI
资助信息	NNSFC under the project of 10173020
语种	英语
WOS记录号	WOS:000227478900026
公开日期	2013-03-06
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/81]
专题	脉冲星研究团组新疆天文台_射电天文研究室新疆天文台_其它研究单元未命名
作者单位	1.CAS, Natl Astron Observ, Urumqi 830011, Peoples R China 2.Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia 3.CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia 4.Univ Calif San Diego, Dept Elect & Comp Engn, San Diego, CA 92093 USA
推荐引用方式 GB/T 7714	Wang, N,Manchester, RN,Johnston, S,et al. Long-term scintillation observations of five pulsars at 1540 MHz[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,358(1):270-282.
APA	Wang, N.,Manchester, RN.,Johnston, S.,Rickett, B.,Zhang, J.,...&Chen, M.(2005).Long-term scintillation observations of five pulsars at 1540 MHz.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,358(1),270-282.
MLA	Wang, N,et al."Long-term scintillation observations of five pulsars at 1540 MHz".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 358.1(2005):270-282.