Single-Pulse Morphology of PSR J1935+1616 (B1933+16) Based on archival data from FAST
R. W. Tian, R. S. Zhao, Marilyn Cruces, H. Liu, D. Li, P. Wang, C. H. Niu, Biping Gong, C. C. Miao, X. Zhu, H. W. Xu, W. L. Li, S. D. Wang, Z. F. Tu, Q. J. Zhi,… 展开作者
R. W. Tian, R. S. Zhao, Marilyn Cruces, H. Liu, D. Li, P. Wang, C. H. Niu, Biping Gong, C. C. Miao, X. Zhu, H. W. Xu, W. L. Li, S. D. Wang, Z. F. Tu, Q. J. Zhi, S. J. Dang, L. H. Shang, S. Xiao
We utilized archived data from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) to analyze the single-pulse profile morphology of PSR J1935$+$1616 (B1933$+$16). The results show that PSR J1935$+$1616 exhibits significant micropulses as well as various changes in single-pulse profile morphology. In the FAST archived data, a total of 969 single pulses with microstructure were identified, accounting for 9.69$\%$ of the total pulse sample, with characteristic widths of $127.63^{+70.74}_{-46.25}$ $μ$s. About half of these pulses display quasiperiodic micropulses, with a periodicity of 231.77 $\pm$ 9.90 $μ$s. Among the 520 single pulses with quasiperiodic microstructure, 208 also exhibit quasiperiodicity in circular polarization, with a characteristic period of $244.70^{+45.66}_{-21.05}$ $μ$s. The micropulse characteristic width in circular polarization is 106.52 $\pm$ 46.14 $μ$s. Compared to normal pulses, the relative energy (E/<E>) of single pulse with microstructure follows a double Gaussian distribution, while that of normal pulses follows a single Gaussian distribution. Based on the intensity of the leading and trailing components in the single-pulse profile morphology of PSR J1935+1616, we classified the pulses into four morphological modes (A, B, C, and D). The relative energy distribution of pulses in mode A is significantly different from the others, following a double Gaussian distribution, while the relative energy distributions in modes B, C, and D follow a single Gaussian distribution. Our study also suggests a possible correlation between micropulses and single-pulse profile morphology. Single pulse with micropulses are most likely to occur in mode A, while their occurrence is least likely in mode D.
帕克斯多波束脉冲星巡天的再处理发现了五颗以前未知的脉冲星和几颗尚未确认的候选者。PSR J 0922 -52的周期为9.68 ms,DM为122.4 pc cm^-3。PSR J1147-66的周期为3.72 ms,DM为133.8 pc cm^-3。PSR J1227-6208的周期为34.53 ms,DM为362.6 pc cm^-3,处于一个6.7天的双星轨道上,桑顿等人在进行中的高分辨率帕克斯巡天中独立探测到了它,爱因斯坦@Home志愿者也在独立处理中探测到了它。PSR J1546-59的周期为7.80 ms,DM为168.3 pc cm^-3。PSR J1725-3853是一颗孤立的4.79 ms脉冲星,DM为158.2 pc cm^-3。这些候选人可能在早期的处理工作中被遗漏,因为他们的DM很高,周期很短,而且需要浏览的候选人数量很大。这些发现表明,在多波束勘测数据中,还有待发现更多的类星体。
The two tails of PSR J2055+2539 as seen by Chandra: analysis of the nebular morphology and pulsar proper motion
我们分析了PSR J2055+2539的两个Chandra观测(总积分时间为$\sim$ 130 ks),以测量其自行并研究其两个细长星云特征。我们没有检测到自行,设定的上限为240 mas yr $^{-1}$(3 $σ$水平),这转化为$\sim$的横向速度上限为700 km s $^{-1}$,假设距离为600 pc。深H $α$观测没有发现与经典脉冲星风星云相关的弓形激波,因此排除了自行方向的间接测量。我们使用一种基于滚动霍夫变换(RHT)的新方法确定了两个星云的主轴,它们之间的夹角为160.8 $^{\circ} \pm 0.7^{\circ}$。我们分析了第一个8'(XMM-牛顿看到的12')的形状,更明亮,非常准直。根据我们的结果从一个标准的分析和从RHT获得的星云模型相结合,我们发现,最亮的星云是弧分尺度弯曲,厚度范围从$\sim9$“到$\sim31$“和可能的(单一或多个)螺旋图案。我们无法控制较暗星云的形状。我们讨论了我们的结果的背景下,其他已知的类似功能,特别强调灯塔星云(与PSR J1101 $-$ 6101)。我们推测,一个特殊的几何形状的供电脉冲星可能在形成这样的功能发挥了重要作用。
Pulsar Gleaners: Discovery of 19 Pulsars in FAST Archival Data at $|b|<5°$ and Decl.$<-5°$
School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education(南京大学现代天文与天体物理教育部重点实验室)
Single-Pulse Study of the Pseudo-nulling Pulsar PSR J1820-0509 Based on FAST Observations
Guizhou Normal University(贵州师范大学);Huazhong University of Science and Technology(华中科技大学);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Tsinghua University(清华大学);Beijing Normal University(北京师范大学);Qilu Normal University(齐鲁工业大学)
PSR J1107-5907的发射不稳定。有时无线电脉冲是不可检测的,在其他时候脉冲发射是微弱的,并且在短时间内发射可以非常明亮。为了提高我们对这些状态变化的理解,我们已经确定了帕克斯射电望远镜的档案数据集,其中存在明亮的发射,并发现发射从未从明亮状态切换到弱状态,而是总是过渡到关闭状态。以前的工作建议将关闭状态识别为弱状态的极端表现。然而,这里报告的关和亮发射之间的联系表明,发射可以被解释为只经历两种发射状态:由亮脉冲和零组成的突发状态以及弱发射状态。
Testing Magnetic Field Configurations in Spider Pulsar PSR J1723-2837 with IXPE
Louisiana State University(路易斯安那州立大学);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);Stanford University(斯坦福大学);Columbia University(哥伦比亚大学);University of Maryland, College Park(马里兰大学帕克分校);Center for Research and Exploration in Space Science and Technology, NASA/GSFC(NASA/戈达德太空飞行中心空间科学与技术研究探索中心);University of Maryland, Baltimore County(马里兰大学巴尔的摩县分校)
The FAST Discovery of a binary millisecond pulsar PSR~J1647-0156B (M12B) with a candidate cross matching algorithm
College of Physics, Guizhou University(贵州大学物理学院);Guizhou Vocational College of Foodstuff Engineering(贵州食品工程职业学院);Shanghai Astronomy Observatory, Chinese Academy of Sciences(中国科学院上海天文台);School 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);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Guizhou Radio Astronomical Observatory, Guizhou University(贵州大学贵州射电天文台);Key Laboratory of Radio Astronomy, Chinese Academy of Sciences(中国科学院射电天文重点实验室)
Probing the properties of the pulsar wind via studying the dispersive effects in the pulses from the pulsar companion in a double neutron-star binary system
Distinct Modes of Pulsar Glitch Activity Revealed by the Waiting-Time--Amplitude Morphology
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);University of Chinese Academy of Sciences(中国科学院大学);College of Mathematics and Physics, Wenzhou University(温州大学数理学院);Xinjiang Key Laboratory of Radio Astrophysics(新疆射电天体物理重点实验室)
Effects of Coronal Mass Ejection on PSR J1022+1001 and Possible Mode Change of PSR J2145-0750 in the InPTA DR2
The Institute of Mathematical Sciences(数学科学研究所);National Centre for Radio Astrophysics, Tata Institute of Fundamental Research(塔塔基础研究院国家射电天文学中心);Homi Bhabha National Institute(霍米·巴巴国立研究所);National Centre for Radio Astrophysics, SP Pune University(SP浦那大学国家射电天文学中心);Indian Institute of Technology Roorkee(印度理工学院勒克瑙分校(注:通常译为鲁尔基分校));Kumamoto University(熊本大学);Indian Institute of Technology Indore(印度理工学院印多尔分校);IIT Hyderabad(印度理工学院海得拉巴分校);Indian Institute of Science Education and Research (IISER) Mohali(昌迪加尔印度科学教育与研究学院(莫哈利校区));University of Mumbai(孟买大学);Raman Research Institute(拉曼研究所);North-West University(西北大学);Indian Institute of Science(印度科学学院);The Christ (Deemed to be University)(基督大学(被视为大学));Indian Institute of Technology Delhi(印度理工学院德里分校);Physical Research Laboratory(物理研究实验室);IISER Bhopal(博帕尔印度科学教育与研究学院);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理学研究所(爱因斯坦研究所));GLA University(GLA大学)
LOFAR observations of the mode-switching pulsar B0943+10
PSR B0943+10是一颗旧的非回收脉冲星,几十年来以其快速和自发的无线电模式切换而闻名。最近,Hermsen等人(2013年)发现了极盖热X射线发射的相关变化,从而证明无线电模式不仅仅是无线电发射区域局部变化的产物,而是某些全球磁层转变的标志。大约在同一时间,由于新一代低频无线电阵列投入使用,可以在电离层透明度窗口的最低边缘进行宽带观测。在这些射频下,PSR B0943+10发射的轮廓形态和单脉冲特性变得非常动态,不仅提供了关于发射本身的细节,而且还提供了关于极隙条件的细节。在这里,我将介绍PSR B0943+10的LOFAR观测的最新结果,并讨论它们对多波长图像的贡献。