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.
Precision Determination of Scintillation Screen Parameters from Annual Modulation Measurement of Pulsar Scintillation Arc Curvature with the FAST Telescope
South-Western Institute for Astronomy Research (SWIFAR), Yunnan University(西南天文研究所,云南大学);Xinjiang Astronomical Observatory, Chinese Academy of Sciences(中国科学院新疆天文台);Key Laboratory of radio Astronomy, Chinese Academy of Sciences(中国科学院射电天文重点实验室);Xinjiang Key Laboratory of radio Astrophysics(新疆射电天体物理重点实验室);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究所);Yunnan Observatories, Chinese Academy of Sciences(中国科学院云南天文台);Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences(中国科学院射电天文与技术重点实验室)
Illuminating Hidden Pulsars: Scintillation-Enhanced Discovery of Two Binary Millisecond Pulsars in M13 with FAST
College of Physics, Guizhou University(贵州大学物理学院);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);Kavli Institute for Astronomy and Astrophysics, Peking University(北京大学科维理天文与天体物理研究所);Guizhou Radio Astronomical Observatory, Guizhou University(贵州大学贵州射电天文台);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台FAST国家重点实验室);College of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);State Key Laboratory of Radio Astronomy and Technology(射电天文与技术国家重点实验室)
Pulsar scintillation studies with LOFAR III. Annual variations in PSR~J0814$+$7429
State Key Laboratory of Radio Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台射电天文技术与重点实验室);University of Chinese Academy of Sciences, Chinese Academy of Sciences(中国科学院大学);Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿交叉科学研究院);Fakultät für Physik, Universität Bielefeld(比勒费尔德大学物理学院);CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院FAST国家天文台);Guizhou Radio Astronomical Observatory, Guizhou University(贵州大学贵州天文台);National Centre for Radio Astrophysics, Tata Institute of Fundamental Research(印度基础研究所国家射电天文中心)
Scintillation of the first-known pulsar planetary system
State Key Laboratory of Radio Astronomy and Technology, Xinjiang Astronomical Observatory, CAS(中国科学院新疆天文台射电天文与技术重点实验室);Xinjiang Key Laboratory of Radio Astrophysics(新疆射电天体物理重点实验室);State Key Laboratory of Radio Astronomy and Technology, National Astronomical Observatories, CAS(中国科学院国家天文台射电天文与技术重点实验室);Centre for Astrophysics and Supercomputing, Swinburne University of Technology(斯威本科技大学天体物理学与超级计算中心);Department of Astronomy and Astrophysics, Pennsylvania State University(宾夕法尼亚州立大学天文学与天体物理系);Center for Exoplanets and Habitable Worlds, Pennsylvania State University(宾夕法尼亚州立大学系外行星与宜居世界中心);Electrical and Computer Engineering, University of California, San Diego(加州大学圣地亚哥分校电气与计算机工程系);New Cornerstone Science Laboratory, Department of Astronomy, Tsinghua University(清华大学天文学新基石科学实验室);Australia Telescope National Facility, CSIRO Space and Astronomy(CSIRO空间与天文局澳大利亚望远镜国家设施)
Modelling annual and orbital variations in the scintillation of the relativistic binary PSR J1141$-$6545
利用Parkes 64 m射电望远镜对相对论脉冲双星PSR J1141 $-$ 6545进行了为期6年的观测,重点研究了衍射强度的变化,以提高天体测量计时模型的精度。长期闪烁,显示轨道和年度变化,使我们能够测量参数,难以单独测量脉冲星定时。其中包括:轨道倾角$i$ ;升交点$Ω$的经度;以及脉冲星系统的横向速度。我们使用年变化来解决以前在倾角意义上的模糊性。使用正确的意义,和一个先验概率分布的约束,从脉冲星定时($i=73\pm3^\circ$),我们发现$Ω=24.8\pm1.8^\circ$,我们估计脉冲星的距离是$D=10^{+4}_{-3}$ kpc。这就给出了这颗脉冲星在赤经上的自行估计为$μ_α\cosδ=2.9\pm1.0$ mas yr $^{-1}$,在赤经上的自行估计为$μ_δ=1.8\pm0.6$ mas yr $^{-1}$。最后,我们得到的星际电子密度波动的空间结构的测量,包括:衍射图案的空间尺度和各向异性;沿视线的散射材料的分布;和空间变化的湍流强度从一个时代到另一个时代。我们发现,散射占主导地位的薄屏幕在距离$(0.724\pm0.008)D$,与各向异性轴比$A_{\rm r} = 2.14\pm0.11$。
Interstellar Scintillation of Three Nearby Pulsars with FAST
School of Physics and Electronic Science, Guizhou Normal University(贵州师范大学物理与电子科学学院);State Key Laboratory of Radio Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台射电天文与技术重点实验室);CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台FAST重点实验室);Guizhou Radio Astronomical Observatory, Guizhou University(贵州大学贵州天文观测站);University of Chinese Academy of Sciences(中国科学院大学);Guizhou University(贵州大学)
Probing AU-Scale Magnetic-Field Reversals in the Interstellar Medium with Pulsar Scintillation
Institute of Astronomy and Astrophysics, Academia Sinica(中央研究院天文及天文物理研究所);Department of Astronomy, Tsing Hua University(清华大学天文学系);Canadian Institute for Theoretical Astrophysics(加拿大理论天体物理研究所);Canadian Institute for Advanced Research (MaRS Centre)(加拿大高级研究院(马尔斯中心));Dunlap Institute for Astronomy and Astrophysics, University of Toronto(多伦多大学邓普勒天文与天体物理研究所);Perimeter Institute of Theoretical Physics(理论物理珀蒂默研究所)
Interstellar scintillation and polarization of PSR B0656+14 in the Monogem Ring
利用500米口径球面射电望远镜(FAST)对PSR~ B 0656 +14进行了一年三个历元的高灵敏度星际闪烁和偏振观测,结果表明PSR ~ B 0656 +14的散射主要由两个不同的致密区组成。我们将离脉冲星较近的那颗星与Monogem环的壳层联系在一起,从而证实了这种联系。另一个可能与本地泡沫有关。我们发现,所观察到的位置角的脉冲星自旋轴和空间速度是显着不同的,与$19\fdg3\pm$ 0 \fdg 8,不符合以前发表的接近完美的对齐$1\degr\pm 2\degr$的分离。在二次谱中,两个独立的散射区域被清楚地定义,显示出两个强的前向抛物弧。弧曲率表明,外弧和内弧对应的散射屏分别位于距PSR B 0656 +14约28秒差距和距地球约185秒差距处。所观察到的多普勒轮廓与电磁模拟的比较表明,这两个散射区域是温和的各向异性。对于外弧,我们估计的各向异性$A_R$约为1.3,与平行的脉冲星速度的散射不规则性对齐。对于外弧,我们比较所观察到的延迟配置文件与延迟配置文件计算从理论上的强散射模型。我们的结果表明,在Monogem环的散射不规则性的空间谱是平坦的比Kolmogorov,但需要进一步的观察来证实这一点。
Interplanetary scintillation-informed heliospheric modelling for the MeerKAT Pulsar Timing Array 4.5 yr dataset
Swinburne University of Technology(斯威本科技大学);OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery(引力波发现ARC卓越中心);CSIRO, Space and Astronomy(CSIRO空间与天文学部)