J-GEM follow-up observations of the gravitational wave source GW151226*
J-GEM follow-up observations of the gravitational wave source GW151226*
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J-GEM对引力波源GW151226*的后续观测
DOI：
10.1093/pasj/psw113
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发表时间：
2017
影响因子：
2.3
通讯作者：
Michitoshi他
中科院分区：
文献类型：
--
作者：
Yoshida;Michitoshi他
我们报告了在 J-GEM（日本引力波电磁跟踪合作）框架内先进 LIGO 检测到的引力波（GW）事件 GW151226 的光学-红外跟踪观测结果。我们使用 Kiso 广角相机 (KWFC)、Hyper Suprime-Cam (HSC) 和 MOA-cam3 进行了广角光学成像测量。 KWFC巡天于GW事件后2.26日开始，覆盖以GW151226星图高银河区域为中心的778°2。我们从事件发生后约12天开始进行HSC跟踪观测，覆盖了北部天空最高概率区域63.5°deg2的区域，i和z波段的极限星等分别为24.6和23.8。在 GW 警报发生后大约 2.5 个月，MOA-cam3 使用 MOA-红色滤镜覆盖了天空图的 145°deg2。大视野调查覆盖的总面积为986.5°deg2。观察区域的综合检测概率为~29%。我们还在事件发生后的 1.61 天用六台光学和近红外望远镜进行了针对星系的观测。总共观测到 238 个附近 (≤100 Mpc) 星系，典型的 I 带限制星等为 ∼19.5。我们通过 KWFC 巡天探测到了 13 颗候选超新星，通过 HSC 巡天探测到了 60 颗河外瞬变星体。三分之二的 HSC 瞬变可能是超新星，其余三分之一可能是活跃的星系核。通过我们的观察活动，我们没有发现可能与 GW151226 相关的瞬变。
We report the results of optical–infrared follow-up observations of the gravitational wave (GW) event GW151226 detected by the Advanced LIGO in the framework of J-GEM (Japanese collaboration for Gravitational wave ElectroMagnetic follow-up). We performed wide-field optical imaging surveys with the Kiso Wide Field Camera (KWFC), Hyper Suprime-Cam (HSC), and MOA-cam3. The KWFC survey started at 2.26 d after the GW event and covered 778 deg2centered at the high Galactic region of the skymap of GW151226. We started the HSC follow-up observations from ∼12 d after the event and covered an area of 63.5 deg2of the highest probability region of the northern sky with limiting magnitudes of 24.6 and 23.8 for theiandzbands, respectively. MOA-cam3 covered 145 deg2of the skymap with the MOA-red filter ∼2.5 mon after the GW alert. The total area covered by the wide-field surveys was 986.5 deg2. The integrated detection probability for the observed area was ∼29%. We also performed galaxy-targeted observations with six optical and near-infrared telescopes from 1.61 d after the event. A total of 238 nearby (≤100 Mpc) galaxies were observed with a typicalIband limiting magnitude of ∼19.5. We detected 13 supernova candidates with the KWFC survey, and 60 extragalactic transients with the HSC survey. Two thirds of the HSC transients were likely supernovae and the remaining one third were possible active galactic nuclei. With our observational campaign, we found no transients that are likely to be associated with GW151226.