使用默奇森广域阵列向银河系反中心搜寻外星智慧生物（SETI）
A search for Extraterrestrial Intelligence (SETI) toward the Galactic Anticenter with the Murchison Widefield Array
摘要：
根据第一次系统的现代低频搜索外星智慧（SETI）的结果，使用默奇森宽场阵列（MWA），这是针对银河系中心领域，我们报告了第二次调查对银河系的Anticenter领域。在99至122 MHz的频率范围内使用MWA，在三小时内，625 sq.°的以猎户座KL为中心的场（在银河系的Anticenter的大致方向上）被观察到，频率分辨率为10 kHz。在这个领域，已知有22颗系外行星。在这些系外行星的位置，我们搜索了与智能文明的无线电传输一致的窄带信号。在5-sigma检测阈值下未发现此类信号。我们的样本与之前用MWA研究的45颗系外行星有很大的不同。（2016），由于银河系中心样本主要是由使用微透镜检测到的系外行星，因此与通过径向速度和过境检测方法发现的朝向Anticenter的系外行星相比，距离要大得多。因此，我们对地外发射器功率的平均有效灵敏度在Anticenter样本中得到了很大的提高。除此之外，我们的数据处理技术得到了改进，减少了我们的观测误差，使我们的最佳检测限与我们以前发表的结果相比降低了大约四倍。
英文摘要：
Following from the results of the first systematic modern low frequency Search for Extraterrestrial Intelligence (SETI) using the Murchison Widefield Array (MWA), which was directed toward a Galactic Center field, we report a second survey toward a Galactic Anticenter field. Using the MWA in the frequency range of 99 to 122 MHz over a three hour period, a 625 sq. deg. field centered on Orion KL (in the general direction of the Galactic Anticenter) was observed with a frequency resolution of 10 kHz. Within this field, 22 exoplanets are known. At the positions of these exoplanets, we searched for narrow band signals consistent with radio transmissions from intelligent civilisations. No such signals were found with a 5-sigma detection threshold. Our sample is significantly different to the 45 exoplanets previously studied with the MWA toward the Galactic Center Tingay et al.(2016), since the Galactic Center sample is dominated by exoplanets detected using microlensing, hence at much larger distances compared to the exoplants toward the Anticenter, found via radial velocity and transit detection methods. Our average effective sensitivity to extraterrestrial transmiter power is therefore much improved for the Anticenter sample. Added to this, our data processing techniques have improved, reducing our observational errors, leading to our best detection limit being reduced by approximately a factor of four compared to our previously published results.
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