We present a directed search for continuous gravitational wave (CW) signals emitted by spinning neutron stars located in the inner parsecs of the Galactic Center (GC). Compelling evidence for the presence of a numerous population of neutron stars has been reported in the literature, turning this region into a very interesting place to look for CWs. In this search, data from the full O3 LIGO-Virgo run in the detector frequency band $[10,2000]\mathrm{Hz}$ have been used. No significant detection was found and 95% confidence level upper limits on the signal strain amplitude were computed, over the full search band, with the deepest limit of about $7.6\times {10}^{-26}$ at $\simeq 142\mathrm{Hz}$. These results are significantly more constraining than those reported in previous searches. We use these limits to put constraints on the fiducial neutron star ellipticity and r-mode amplitude. These limits can be also translated into constraints in the black hole mass–boson mass plane for a hypothetical population of boson clouds around spinning black holes located in the GC.

中文翻译：

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在 O3 LIGO-Virgo 数据中搜索银河系中心的连续引力波发射

我们提出了对位于银河中心 (GC) 内部秒差距的旋转中子星发出的连续引力波 (CW) 信号的定向搜索。文献中报道了存在大量中子星的令人信服的证据，使该地区成为寻找 CW 的非常有趣的地方。在此搜索中，来自完整 O3 LIGO-Virgo 的数据在检测器频带中运行$[10,2000]\mathrm{赫兹}$被用过。没有发现显着的检测结果，并且在整个搜索范围内计算了信号应变幅度的 95% 置信水平上限，最深限约为$7.6\times {10}^{-26}$在$\simeq 142\mathrm{赫兹}$. 这些结果比以前搜索中报告的结果更受限制。我们使用这些限制来限制基准中子星的椭圆率和 r 模式幅度。这些限制也可以转化为黑洞质量 - 玻色子质量平面中的约束，用于位于 GC 中的旋转黑洞周围的假设玻色子云群。