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arXiv 2107.09727astro-ph.HEgr-qc
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七颗快中子星连续引力波的新搜寻

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

摘要:

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.

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