撒丁岛射电望远镜首次高频技术签名搜索调查
The First High Frequency Technosignature Search Survey with the Sardinia Radio Telescope
AI总结：
本研究利用撒丁岛射电望远镜在6 GHz和18 GHz进行首次高频技术签名搜索，覆盖银河系中心和72个TESS目标，未发现外星信号，但为约5×10^5颗恒星设定了新的辐射功率上限。
摘要：
寻找来自技术先进的外星智慧生物的无线电信号的传统研究主要集中在1.4 GHz附近。在本文中，我们将搜索扩展到前所未有的领域，详细介绍了我们在6 GHz的广泛观测，并启动了使用撒丁岛射电望远镜（SRT）在18 GHz的首次调查。我们的策略包括严格的观测时段，总计36小时，指向银河系中心和72个选定的TESS目标，这使其成为迄今为止最全面的高频技术签名搜索。我们的窄带信号搜索未发现来自所调查区域的、可能表明外星来源的漂移信号的确凿证据。尽管如此，我们的努力使我们能够对约$5\ imes 10^{5}$颗恒星的射电辐射存在设定新的限制，确立了各向同性辐射功率上限为$1.8\ imes 10^{19} W$。我们还提供了对两个频率记录到的“命中”的比较分析，以强调在更高频率进行技术签名搜索的重要性，因为那里的频谱环境不那么拥挤，更有利于探测。
英文摘要：
The quest for radio signals from technologically-advanced extraterrestrial intelligence has traditionally concentrated on the vicinity of 1.4 GHz. In this paper, we extend the search to unprecedented territories, detailing our extensive observations at 6 GHz and initiating the first-ever survey at 18 GHz with the Sardinia Radio Telescope (SRT). Our strategy entailed rigorous observation sessions, totaling 36 hours, directed towards the Galactic Center and 72 selected TESS targets-making this the most comprehensive high-frequency technosignature search to date. Our narrowband signal search found no definitive evidence of drifting signals that could suggest an extraterrestrial origin from the surveyed regions. Nevertheless, our efforts have enabled us to set new constraints on the presence of radio emissions from approximately $5\times 10^{5}$ stars, establishing an isotropic radiated power limit of $1.8\times 10^{19} W$. We also provide a comparative analysis of the 'hits' recorded across both frequencies to highlight the significance of pursuing technosignature searches at higher frequencies, where the spectral landscape is less congested and more conducive to detection.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
