论文标题
伽马射线脉冲星的定时阵列限制了纳米赫兹引力波背景
A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background
论文作者
论文摘要
大星系合并后，其中央超级黑洞有望形成二元系统，其轨道运动在纳米赫兹频率下会产生引力波背景（GWB）。搜索此背景利用Pulsar定时阵列，该脉冲星阵列在无线电波长下对毫秒脉冲星（MSP）进行长期监测。我们使用12。5年的费米大面积望远镜数据来形成伽马射线脉冲星的计时阵列。 35个明亮的伽马射线脉冲星的结果将95 \％可信的限制限制为$ 1.0 \ times10^{ - 14} $在1 yr $^{ - 1} $时，该份量缩放为观察时间span $ t $ t _ {\ mathrm {obs}}}}^}^{ - 13/6} $。该直接测量提供了对GWB的独立探针，同时提供了对无线电噪声模型的检查。
After large galaxies merge, their central supermassive black holes are expected to form binary systems whose orbital motion generates a gravitational wave background (GWB) at nanohertz frequencies. Searches for this background utilize pulsar timing arrays, which perform long-term monitoring of millisecond pulsars (MSPs) at radio wavelengths. We use 12.5 years of Fermi Large Area Telescope data to form a gamma-ray pulsar timing array. Results from 35 bright gamma-ray pulsars place a 95\% credible limit on the GWB characteristic strain of $1.0\times10^{-14}$ at 1 yr$^{-1}$, which scales as the observing time span $t_{\mathrm{obs}}^{-13/6}$. This direct measurement provides an independent probe of the GWB while offering a check on radio noise models.
