PSR J1420-6048是一颗年轻的伽马射线脉冲星,具有周期性的毛刺。利用费米伽马射线太空望远镜获得的长期监测数据,我们发现PSR J1420-6048显示了伽马射线通量的变化,我们还在2008年至2019年期间检测到了四次故障。其中两个故障是以前未知的,它们的伽马射线光谱也显示了每个故障之间的变化。由于结果可能被污染的背景源,我们讨论了所观察到的流量和光谱的变化是由人为的错误分配的光子从附近的脉冲星风星云(HESS J1420-607)和脉冲星(PSR J1418-6058),或从目标脉冲星本身的发射几何形状的变化。我们研究的相关性的磁通量的变化和交替脉冲结构,以调查是否在外磁层的发射几何形状发生变化。在假设这些观测特征不完全由背景环境引起的前提下,我们将我们的结果与其他γ射线源观测到的类似现象进行了比较,并提出强烈的地壳破裂可以引起中子星的时间异常,它可以影响粒子的加速或对产生区域,从而导致发射行为的改变。
英文摘要:
PSR J1420-6048 is a young gamma-ray pulsar with recurrent glitches. Utilizing long-term monitoring data obtained from the Fermi Gamma-ray Space Telescope, we found that PSR J1420-6048 has shown gamma-ray flux variation and we also detected four glitches between 2008 and 2019. Two of the glitches are previously unknown, and their gamma-ray spectrum also shows variability between each glitch. Since the results might be contaminated by background sources, we discuss whether the observed changes in flux and spectra were caused by artificial misallocations of photons from a nearby pulsar wind nebula (HESS J1420-607) and a pulsar (PSR J1418-6058), or a change of the emission geometry from the target pulsar itself. We examine the correlation of the flux changes and the alternating pulse structure to investigate whether the emission geometry in the outer magnetosphere was changing. By assuming the observational features were not totally resulted from the background environment, we compare our results with similar phenomena observed in other gamma-ray pulsars and propose that a strong crust crack can cause timing anomaly of a neutron star, which can affect the particle accelerations or pair creation regions resulting in the changes of emission behaviors.
No Measurable Changes in Radio and X-ray Emission Surrounding Glitches in the Young Pulsar PSR J2229+6114
McGill University(麦吉尔大学);Trottier Space Institute, McGill University(麦吉尔大学特罗蒂尔空间研究所);Anton Pannekoek Institute for Astronomy, University of Amsterdam(阿姆斯特丹大学安东·潘内科克天文学研究所);ASTRON, Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);University of British Columbia(不列颠哥伦比亚大学)
Return of the Big Glitcher: NICER timing and glitches of PSR J0537-6910
PSR J 0537 -6910也被称为Big Glitcher,是已知最多产的脉冲星,其自旋诱导的脉动只能在X射线中检测到。我们分析了从2017年8月到2020年4月的2.7年NICER定时观测结果。我们获得了一个旋转相位连接的整个时间跨度的定时模型,它与LIGO/室女座的第三次观测运行重叠,从而使最灵敏的引力波搜索这个潜在的强引力波发射脉冲星。我们发现,故障之间的短期制动指数在较长的时间内下降到7或更低的值,因为前面的故障。通过结合NICER和RXTE数据,我们测量了长期制动指数n=-1.25+/-0.01。我们的分析揭示了8个新的毛刺,这是自2011年RXTE接近尾声以来首次检测到的毛刺,NICER和RXTE毛刺活动的总活动量为8.88x10^-7 yr^-1。新的毛刺遵循之前使用RXTE数据建立的看似独特的下一个毛刺时间-毛刺大小相关性,斜率为5 d microHz^-1。对于NICER在两侧观察两天的一个毛刺,我们搜索但没有看到可能与毛刺相关的光谱或脉冲轮廓变化的明确证据。
PSR J0537-6910: Exponential recoveries detected for 12 glitches
Instituto Argentino de Radioastronomía(阿根廷射电天文研究所);Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata(拉普拉塔国立大学天文与地球物理学院);Departamento de Física, Universidad de Santiago de Chile (USACH)(圣地亚哥智利大学物理系);Center for Interdisciplinary Research in Astrophysics and Space Sciences (CIRAS), Universidad de Santiago de Chile(圣地亚哥智利大学天体物理学与空间科学跨学科研究中心);Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester(曼彻斯特大学天体物理学中心);Department of Physics and Astronomy, Haverford College(哈弗福德学院物理与天文系);SRON - Space Research Organisation Netherlands(荷兰空间研究所);Department of Space, Earth and Environment, Chalmers University of Technology(查尔姆斯理工大学空间、地球与环境系)
New and updated timing models for seven young energetic X-ray pulsars, including the Big Glitcher PSR J0537-6910
Haverford College(哈弗福德学院);Space Research Organisation Netherlands(荷兰空间研究组织);Universidad de Santiago de Chile (USACH)(智利圣地亚哥大学);Center for Interdisciplinary Research in Astrophysics and Space Sciences (CIRAS), Universidad de Santiago de Chile(智利圣地亚哥大学天体物理与空间科学跨学科研究中心);IRAP, CNRS(法国国家科学研究中心天体物理学研究所);Université de Toulouse, CNES, UPS-OMP(图卢兹大学、法国国家空间研究中心、 ups-omp);X-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center(NASA戈达德太空飞行中心X射线天体物理实验室);Theoretical Division, Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室理论部);Columbia Astrophysics Laboratory, Columbia University(哥伦比亚大学天体物理实验室)
Discovery of Short-Term γ-Ray Pulsed Radiation Variations Following a Glitch in PSR J0205+6449
State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理国家重点实验室);University of Chinese Academy of Sciences(中国科学院大学);Department of Physics and Institute of Theoretical Physics, Nanjing Normal University(南京师范大学物理科学与技术学院理论物理研究所)
Search for gamma-ray variability around Fermi-LAT pulsar glitches
Friedrich-Alexander Universität Erlangen-Nürnberg(弗里德里希·亚历山大埃尔朗根-纽伦堡大学);Istituto Nazionale di Fisica Nucleare, Sezione di Pisa(意大利国家核物理研究所比萨分部);Università di Pisa, Dipartimento di Fisica E. Fermi(比萨大学E.费米物理系);Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz(加州大学圣克鲁兹分校粒子物理研究所、物理系和天文与天体物理系)
Braking index of the frequently glitching PSR J0537$-$6910
School of Arts and Sciences, Qingdao Binhai University(青岛滨海学院文理学院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Department of Astronomy and Space Sciences, Istanbul University(伊斯坦布尔大学天文学与空间科学系);Bahçeşehir College(巴切希尔学院);Faculty of Engineering and Natural Sciences, Sabancı University(萨班哲大学工程与自然科学学院);Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester(曼彻斯特大学物理与天文学系乔德雷尔银行天体物理学中心);Departamento de Física, Universidad de Santiago de Chile (USACH)(圣地亚哥智利大学物理系)
Variability of VHE $γ$-ray emission from the binary PSR B1259-63/LS 2883
本文研究了从双星系统PSR B 1259 -63/LS 2883的方向观测到的$γ$射线强度在其三次近星点通过期间的变化。一个简单而直接的方法是适用于公布的数据与成像大气切伦科夫技术。不管检测过程中的许多问题,该方法仅适用于在指定区域中记录的非常高能量的光子的数量。在该方案的范围内,我们认识到变化归因于高水平的显着性的内在源活动的变化。
Secular Evolution of PSR J2021+4026: Long-Term γ-Ray Flux and Spin-Down Variability Beyond State Transitions
Central China Normal University(华中师范大学);Institute of Astrophysics, Central China Normal University(华中师范大学天文物理研究所);State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理国家重点实验室);University of Chinese Academy of Sciences, Chinese Academy of Sciences(中国科学院大学)
PSR J2021+4026的长期伽马射线通量和自转减速变异性研究揭示了其在状态转换之外的长期演化特征。