反太阳点技术特征巡天：艾伦望远镜阵列的SETI研究所史上最大规模观测活动
A Technosignature Survey Of The Anti-Solar Point: The SETI Institute's Largest-Ever Campaign With The Allen Telescope Array
- University of Oxford（牛津大学）
- The SETI Institute（SETI研究所）
- University of California, Berkeley（加州大学伯克利分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究利用艾伦望远镜阵列对反太阳点进行射电技术特征巡天，基于谢林点概念搜寻地外信号，已覆盖12%坐标范围，发现25个候选信号，是首次观测覆盖并成为ATA最大规模巡天。
AI中文摘要：
ATA-ASP巡天是一项针对反太阳点作为“谢林点”的射电技术特征巡天，使用艾伦望远镜阵列（ATA）进行地外智慧生命搜寻（SETI）。我们借鉴博弈论中的谢林点概念，假设存在一个时空坐标，我们与地外智慧体可能都会在此发送并搜寻信号。从太阳的相反方向观察，地外智慧体可以探测到地球在宜居带内的凌星现象，因此这个反太阳点（ASP）构成了一个共同且显著的谢林点。本巡天使用调谐至2356-3700 MHz的ATA，观测地球的黄道面，并搜寻天空定位的窄带、多普勒漂移信号。分析采用艾伦望远镜巡天不可知技术特征处理流水线（ATSAT），该流水线整合了bliss和NBeamAnalysis软件包，并包含射频干扰去除功能，输出频谱图。窄带信号及其多普勒漂移率表明其具有技术特征且来自遥远距离，而波束成形波束之间的比较则将信号定位到反太阳点。所有图像均经过目视检查，并按六种信号形态分类，以区分潜在感兴趣信号与射频干扰。迄今为止，该巡天已在126次观测中覆盖了约12%的预期坐标范围；67%的观测时段已完成分析，产生了超过11,000幅图像，全部经过检查，其中75%已标注。这些已标注的频谱图中，有25幅包含天空定位至反太阳点的窄带漂移信号，对应的10个坐标将被重新观测。尽管SETI文献长期以来一直提议在反太阳点搜寻信标，但本巡天提供了首次观测覆盖。观测地球黄道面将需要多年的努力，并产生超过11拍字节的数据，使其成为ATA有史以来规模最大的巡天。
英文摘要：
The ATA-ASP campaign is a radio technosignature survey of the Anti-Solar Point as a "Schelling point", using the Allen Telescope Array (ATA) in the Search for Extraterrestrial Intelligence (SETI). We borrow from game theory the concept of Schelling points to hypothesize spacetime coordinates where both we and an extraterrestrial agent might send and search for a signal. From the perspective opposite the Sun, an extraterrestrial agent could detect Earth transiting within the habitable zone, thus this Anti-Solar Point (ASP) poses a shared and salient Schelling point. This campaign uses the ATA, tuned to 2356-3700 MHz, to observe Earth's ecliptic, and searches for sky-localized, narrowband, Doppler-drifting signals. Analysis is conducted using the Allen Telescope Survey Agnostic Technosignature pipeline (ATSAT), which integrates software packages bliss and NBeamAnalysis with radio frequency interference removal and outputs spectrograms. Narrowband signals and their Doppler-drift rates indicate technological and distant origin, while comparing beamformed beams localizes signals to the ASP. The plots are visually inspected and cataloged into six signal morphologies to distinguish potential signals-of-interest and radio frequency interference. To date, the survey has observed approximately 12% of the projected coordinate coverage over 126 observations; 67% of sessions have been analyzed, producing more than 11,000 plots, all of which have been inspected and 75% labeled. 25 of these labeled spectrograms contain narrowband drifting signals sky-localized to the ASP, and the 10 corresponding coordinates will be re-observed. Although SETI literature has long proposed searching for beacons at the ASP, this campaign provides the first observational coverage. Observing Earth's ecliptic will require a multi-year effort and produce over 11 petabytes of data, making it the ATA's largest survey ever.
