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arXiv 1706.08896astro-ph.HEastro-ph.GAastro-ph.IM
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基于闪烁探测器的非脉冲射电辐射

Scintillation based search for off-pulse radio emission from pulsars

Kumar Ravi, Avinash A. Deshpande

摘要:

我们提出了一种新的方法来检测关闭脉冲(非脉冲和/或连续)发射的恒星,使用与星际闪烁的强度调制。我们的技术包括获得动态光谱,分别为脉冲窗口和脉冲区域,时间和频率分辨率,适当采样的强度变化,由于衍射闪烁,然后估计它们的相互关系作为衡量脉冲发射,如果有的话。我们描述和说明这种技术的基本细节的帮助下,模拟,以及真实的数据。我们还讨论了这种方法的优势,较早的方法来检测脉冲发射。特别是,我们指出如何测量设置固有的某些非理想性可能会影响早期方法的估计,并认为目前的技术是免疫这种非理想性。我们验证了上述两种情况与相关的模拟。我们应用这种方法观察PSR B 0329 +54在730和810 MHz的频率,与绿岸望远镜和目前的上限在这两个频率的关断脉冲强度。我们希望这种技术能够为广泛的调查关闭脉冲发射铺平道路,甚至现有的动态光谱数据的帮助下,当然,更敏感的长期数据,从新的观测。

英文摘要:

We propose a new method to detect off-pulse (unpulsed and/or continuous) emission from pulsars, using the intensity modulations associated with interstellar scintillation. Our technique involves obtaining the dynamic spectra, separately for on-pulse window and off-pulse region, with time and frequency resolutions to properly sample the intensity variations due to diffractive scintillation, and then estimating their mutual correlation as a measure of off-pulse emission, if any. We describe and illustrate the essential details of this technique with the help of simulations, as well as real data. We also discuss advantages of this method over earlier approaches to detect off-pulse emission. In particular, we point out how certain non-idealities inherent to measurement set-ups could potentially affect estimations in earlier approaches, and argue that the present technique is immune to such non-idealities. We verify both of the above situations with relevant simulations. We apply this method to observation of PSR B0329+54 at frequencies 730 and 810 MHz, made with the Green Bank Telescope and present upper limits for the off-pulse intensity at the two frequencies. We expect this technique to pave way for extensive investigations of off-pulse emission with the help of even existing dynamic spectral data on pulsars and of course with more sensitive long-duration data from new observations.

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