论文标题
连续重力波中天空的频率解析
A frequency resolved atlas of the sky in continuous gravitational waves
论文作者
论文摘要
我们介绍了使用Ligo O3A公共数据生成的连续重力波天空的第一个地图集。对于每个0.045 Hz频带和天空上的每个点，地图集提供引力波振幅上限，信噪比（SNR）和搜索测量最大SNR的频率。通过一系列更敏感的搜索，将大约1.5％的地图集结果重新分析，目的是从孤立的中子恒星中找到高SNR长相干信号。但是，这些搜索并未揭示此类信号的存在。用猎鹰管道产生的结果是在500-1000 Hz频段中覆盖几乎单色重力波信号，最高为+/- 5E-11 Hz/s频率导数。 Falcon管道使用一系列连贯的长度计算搜索数据的松散相干功率估计。在此搜索中，我们使用了6个月的数据，从12小时的相干长度开始，直到6天。与先前发布的最敏感的结果（也由猎鹰管道产生）相比，我们的上限限制了50％。椭圆度为1E-8的中子星可以在150 pc上检测到1E-8，同时可以通过非重力通道损失恒星的大量能量。这些结果在[33]中建议的1E-9中的_mimum _中子星椭圆度的数量级内。
We present the first atlas of the continuous gravitational wave sky, produced using LIGO O3a public data. For each 0.045 Hz frequency band and every point on the sky the atlas provides gravitational wave amplitude upper limits, signal-to-noise ratios (SNR) and frequencies where the search measures the maximum SNR. The approximately top 1.5% of the atlas results are reanalyzed with a series of more sensitive searches with the purpose of finding high SNR long coherence signals from isolated neutron stars. However, these searches do not reveal the presence of such signals. The results presented in the atlas are produced with the Falcon pipeline and cover nearly monochromatic gravitational-wave signals in the 500-1000 Hz band, with up to +/- 5e-11 Hz/s frequency derivative. The Falcon pipeline computes loosely coherent power estimates to search data using a succession of coherence lengths. For this search we used 6 months of data, started with a 12 hour coherence length and progressed to 6 days. Compared to the most sensitive results previously published (also produced with the Falcon pipeline) our upper limits are 50% more constraining. Neutron stars with ellipticity of 1e-8 can be detected up to 150 pc away, while allowing for a large fraction of the stars' energy to be lost through non-gravitational channels. These results are within an order of magnitude of the _minimum_ neutron star ellipticity of 1e-9 suggested in [33].
