古姆星云是一个重要的背景脉冲星星际散射盘吗?

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Rui Wang, Zhen Yan, Zhiqiang Shen, KeJia Lee, Yajun Wu, Rongbing Zhao, Zhipeng Huang, Xiaowei Wang, Jie Liu
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引用次数: 0

摘要

胶状星云是一个微弱的超新星残余物,横跨南天约40°,可能会影响数十颗背景脉冲星。在过去的五十年里,胶状星云作为背景脉冲星的潜在散射屏的观点被反复提及,但一直没有得到直接证实。我们选择了强背景脉冲星PSR B0740-28作为探针,利用上海天马射电望远镜(TMRT)在2.25 & 8.60 GHz频率上同时对其衍射星际闪烁(DISS)进行了约两年的监测。在这两个频率上都探测到了DISS,并通过二维自相关分析对其进行了量化。我们计算了它们的散射谱指数α,发现9/21的观测结果符合理论预测,而4/21的观测结果明确显示出α <4。这一发现为脉冲星沿视线的异常散射提供了强有力的支持,这是由于我们的双频观测具有较大的频率杠杆臂和同时观测的特点。与 2.25 GHz 的观测结果相比,在 8.60 GHz 观测结果的 10/21 副频谱图中都观测到了闪烁弧。因此,脉冲星闪烁弧探测的最高频率记录被更新为 8.60 GHz。我们的拟合结果为胶状星云充当背景脉冲星散射屏的观点提供了最直接的证据,因为闪烁屏的距离(245 +69-72 pc)和横向速度(22.4 4.1-4.2 km s-1)都与胶状星云的相关参数相当。我们的研究结果表明,各向异性散射比各向同性散射更能解释闪烁弧的年度调制。此外,我们还拟合了其长轴的方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Is the Gum Nebula an important interstellar scattering disk of background pulsars?

The Gum Nebula is a faint supernova remnant extending about 40° across the southern sky, potentially affecting tens of background pulsars. Though the view that the Gum Nebula acts as a potential scattering screen for background pulsars has been recurrently mentioned over the past five decades, it has not been directly confirmed. We chose the strong background pulsar PSR B0740-28 as a probe and monitored its diffractive interstellar scintillation (DISS) at 2.25 & 8.60 GHz simultaneously for about two years using the Shanghai Tian Ma Radio Telescope (TMRT). DISS was detected at both frequencies and quantified by two-dimensional autocorrelation analysis. We calculated their scattering spectral index α and found that 9/21 of the observations followed the theoretical predictions, while 4/21 of them clearly showed α < 4. This finding provides strong support for anomalous scattering along the pulsar line of sight, due to the large frequency lever arm and the simultaneous features of our dual-frequency observations. In comparison to the 2.25 GHz observations, scintillation arcs were observed in 10/21 of the secondary spectrum plots for 8.60 GHz observations. Consequently, the highest frequency record for pulsar scintillation arc detection was updated to 8.60 GHz. Our fitting results were the most direct evidence for the view that the Gum Nebula acts as the scattering screen for background pulsars, because both the distance (245 +69−72 pc) and transverse speed (22.4 4.1−4.2 km s−1) of the scintillation screen are comparable with related parameters of the Gum Nebula. Our findings indicated that anisotropic scattering provides a superior explanation for the annual modulation of scintillation arcs than isotropic scattering. Additionally, the orientation of its long axis was also fitted.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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