arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.0738astro-ph.HEastro-ph.GAastro-ph.IM
收藏

几种新类星体的脉冲展宽分析及反常散射

Pulse broadening analysis for several new pulsars and anomalous scattering

Wojciech Lewandowski, Marta Dembska, Jaroslaw Kijak, Magdalena Kowalinska

摘要:

我们使用GMRT和Effelsberg射电望远镜收集的数据,在几个频率下对25颗恒星的脉冲展宽现象进行了分析。其中22颗卫星以前没有在这方面进行过研究,我们的工作使具有多频散射测量的卫星总数增加到近50颗,基本上是迄今为止可用数量的两倍。我们观察到的大多数恒星都具有高到非常高的色散测量值(DM>200),我们的结果证实了Loehmer等人的建议。(2001 2004年),高DM天体的散射时间谱指数偏离由一个单一的薄屏幕模型与柯尔莫哥洛夫分布的密度波动的预测值。在本文中,我们讨论了这种偏差的可能解释。

英文摘要:

We show the results of our analysis of the pulse broadening phenomenon in 25 pulsars at several frequencies using the data gathered with GMRT and Effelsberg radiotelescopes. Twenty two of these pulsars were not studied in that regard before and our work has increased the total number of pulsars with multi-frequency scattering measurements to almost 50, basically doubling the amount available so far. The majority of the pulsars we observed have high to very-high dispersion measures (DM>200) and our results confirm the suggestion of Loehmer et al.(2001, 2004) that the scatter time spectral indices for high-DM pulsars deviate from the value predicted by a single thin screen model with Kolmogorov's distribution of the density fluctuations. In this paper we discuss the possible explanations for such deviations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑