利用PSR B1937 +21的高节奏观测对单个引力波强度的限制
Limits on the strength of individual gravitational wave sources using high-cadence observations of PSR B1937+21
摘要：
我们提出了一个搜索的结果，引力波（GW）从个人来源使用高节奏的观测PSR B1937+21。这些数据是在2011年6月至2013年5月期间使用Jodrell Bank的Lovell望远镜进行的密集观测活动中获得的。几乎每天的节奏实现，使我们能够敏感的GWs的频率高达$4.98\times10^{-6}\,\rm {Hz}$，扩展了脉冲星定时阵列探测的典型频率范围的上限。我们使用的意见，在三个不同的无线电频率与韦斯特博克综合射电望远镜，以纠正分散措施的影响和散射的变化。经校正的定时残差表现出幅度为$~150\,\rm {ns}$、频率为$3.4\rm {yr}^{-1}$的未建模周期性噪声。由于信号并不存在于整个数据集中，我们将其归因于脉冲星的旋转行为，排除了GW或小行星作为原因的可能性。在去除该噪声分量之后，我们将单个源的GW应变分别限制为在$10^{-7}\,\rm {Hz}$处的$h_{\rm s}=1.53\times10^{-11}$和$h_{\rm s}=4.99\times10^{-14}$，用于随机源位置和最佳源位置。
英文摘要：
We present the results of a search for gravitational waves (GWs) from individual sources using high cadence observations of PSR B1937+21. The data were acquired from an intensive observation campaign with the Lovell telescope at Jodrell Bank, between June 2011 and May 2013. The almost daily cadence achieved, allowed us to be sensitive to GWs with frequencies up to $4.98\times10^{-6}\,\rm {Hz}$, extending the upper bound of the typical frequency range probed by Pulsar Timing Arrays. We used observations taken at three different radio frequencies with the Westerbork Synthesis Radio Telescope in order to correct for dispersion measure effects and scattering variances. The corrected timing residuals exhibited an unmodeled periodic noise with an amplitude $~150\,\rm {ns}$ and a frequency of $3.4\rm {yr}^{-1}$. As the signal is not present in the entire data set, we attributed it to the rotational behaviour of the pulsar, ruling out the possibilities of being either due to a GW or an asteroid as the cause. After removing this noise component, we placed limits on the GW strain of individual sources equaling to $h_{\rm s}=1.53\times10^{-11}$ and $h_{\rm s}=4.99\times10^{-14}$ at $10^{-7}\,\rm {Hz}$ for random and optimal sources locations respectively.
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