New searches for continuous gravitational waves from seven fast pulsars
Anjana Ashok, Banafsheh Beheshtipour, Maria Alessandra Papa, Paulo C. C. Freire, Benjamin Steltner, Bernd Machenschalk, Oliver Behnke, Bruce Allen, Reinhard Prix
我们从七个天体中进行连续引力波的搜索,这些天体以前没有在高级LIGO数据的连续波搜索中被定位。我们的目标是发射精确的两倍的旋转频率的恒星和在一个小的带在这样的频率。前一种研究假设引力波四极子随脉冲星的旋转而变化,并与脉冲星的旋转相位锁定。在一定频率范围内的搜索允许发射无线电信号的组件和发射引力波的组件之间的差分旋转,例如地壳或磁层相对于地核。来自阿雷西博327 MHz漂移扫描脉冲星巡天(AO327)观测的时间解决方案。没有发现信号的证据,并且对引力波振幅设定了上限。对于其中一颗恒星,我们探测引力波的内禀振幅,它比自旋下降极限高3.8倍,假设正则转动惯量为$10^{38}$ kg m $^2$。我们最严格的椭圆率约束是$1.5 \times 10^{-8}$,这个值正好在中子星地壳所能承受的范围之内。
英文摘要:
We conduct searches for continuous gravitational waves from seven pulsars, that have not been targeted in continuous wave searches of Advanced LIGO data before. We target emission at exactly twice the rotation frequency of the pulsars and in a small band around such frequency. The former search assumes that the gravitational wave quadrupole is changing phase-locked with the rotation of the pulsar. The search over a range of frequencies allows for differential rotation between the component emitting the radio signal and the component emitting the gravitational waves, for example the crust or magnetosphere versus the core. Timing solutions derived from the Arecibo 327-MHz Drift-Scan Pulsar Survey (AO327) observations are used. No evidence of a signal is found and upper limits are set on the gravitational wave amplitude. For one of the pulsars we probe gravitational wave intrinsic amplitudes just a factor of 3.8 higher than the spin-down limit, assuming a canonical moment of inertia of $10^{38}$ kg m$^2$. Our tightest ellipticity constraint is $1.5 \times 10^{-8}$, which is a value well within the range of what a neutron star crust could support.
Einstein@Home Searches for Gamma-ray Pulsars in the Inner Galaxy
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));University of California at Santa Cruz(加州大学圣克鲁兹分校);Oregon State University(俄勒冈州立大学);Ecole polytechnique(巴黎综合理工学院);Institut Polytechnique de Paris(巴黎理工学院);Naval Research Laboratory(海军研究实验室)
A survey for radio pulsars and transients in the 10 pc region around Sgr A*
Max-Planck-Institut für Radioastronomie(马克斯·普朗克射电天文研究所);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);INAF – Osservatorio Astronomico di Cagliari(意大利国家天体物理研究院卡利亚里天文台);Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester(曼彻斯特大学物理学与天文学系乔德雷尔银行天体物理学中心);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);State Key Laboratory of Radio Astronomy and Technology(射电天文与技术国家重点实验室)
本文报道了用MeerKAT望远镜在球状星团M28中发现的两颗黑寡妇毫秒双星。PSR J1824 $-$ 2452 M(M28 M)是一颗4.78毫秒的脉冲星,在$5.82\,$小时轨道上运行; PSR J1824 $-$ 2452 N(M28 N)是一颗3.35毫秒的脉冲星,在$4.76\,$小时轨道上运行。这两颗双星都有$119.30\,$ pc $\,$ cm $^{-3}$附近的色散测量值,并且有低质量的伴星($\sim$ $0.01-0.03\,$ M $_\odot$),它们不会引起强烈的射电食或轨道变化。包括这些系统在内,M28中目前已知有五个黑寡妇卫星。脉冲星搜索是MeerKAT球状星团普查初始阶段的一部分(在TRAPUM大型调查项目中)。这些微弱的发现证明了MeerKAT的调查灵敏度比以前的搜索的优势,我们希望在这个集群的继续搜索中找到更多的恒星。
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)
Pulsar searches of Fermi-LAT gamma-ray sources with the MWA
International Centre for Radio Astronomy Research, Curtin University(国际射电天文中心,科廷大学);Australian SKA Regional Centre (AusSRC), Curtin University(澳大利亚SKA区域中心,科廷大学);Manly Astrophysics(曼利天体物理学);Laboratoire d’Astrophysique de Bordeaux, Université de Bordeaux, CNRS(波尔多天体物理实验室,波尔多大学,法国国家科学研究中心)
Discovery of Two Highly Scattered Pulsars from Image-Based Circular Polarization Searches with the Australian SKA Pathfinder
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Leibniz Universität Hannover(汉诺威莱布尼茨大学);Center for Gravitation, Cosmology, and Astrophysics, Department of Physics, University of Wisconsin-Milwaukee(威斯康星大学密尔沃基分校物理系引力、宇宙学与天体物理中心);CSIRO Space and Astronomy(澳大利亚联邦科学与工业研究组织空间与天文部);Department of Physics and Astronomy, University of North Carolina at Chapel Hill(北卡罗来纳大学教堂山分校物理与天文学系);International Centre for Radio Astronomy Research, Curtin University(科廷大学国际射电天文研究中心);Sydney Institute for Astronomy, School of Physic(悉尼天文学院,物理学院)
The Targeted Standard Siren Cosmology with Pulsar Timing Arrays
Indian Institute of Science Education and Research Bhopal(印度科学教育研究所博帕尔分校);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Leibniz Universität Hannover(汉诺威莱布尼茨大学)
Red noise and evolving signals: a complete frequentist approach to supermassive black hole binary searches with pulsar timing arrays
Huazhong University of Science and Technology(华中科技大学);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Leibniz Universität Hannover(汉诺威莱布尼茨大学);University of Texas Rio Grande Valley(德克萨斯里奥格兰德河谷大学);IIT Hyderabad(印度理工学院海德拉巴分校)
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)
Multi-messenger Approaches to Supermassive Black Hole Binary Detection and Parameter Estimation: Implications for Nanohertz Gravitational Wave Searches with Pulsar Timing Arrays
A new likely pulsar binary in 47~Tucanae from continuum searches
Texas Tech University(德克萨斯理工大学);International Centre for Radio Astronomy Research – Curtin University(国际射电天文研究中心 - 科廷大学);University of Texas-Rio Grande Valley(德克萨斯大学里奥格兰德河谷分校);Michigan State University(密歇根州立大学);University of Alberta(阿尔伯塔大学)