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arXiv 1808.03400astro-ph.HE
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快速射电暴151230的光学跟踪观测

Optical follow-up observation of Fast Radio Burst 151230

Nozomu Tominaga, Yuu Niino, Tomonori Totani, Naoki Yasuda, Hisanori Furusawa, Masayuki Tanaka, Shivani Bhandari, Richard Dodson, Evan Keane, Tomoki Morokuma, Em… 展开作者

Nozomu Tominaga, Yuu Niino, Tomonori Totani, Naoki Yasuda, Hisanori Furusawa, Masayuki Tanaka, Shivani Bhandari, Richard Dodson, Evan Keane, Tomoki Morokuma, Emily Petroff, Andrea Possenti

摘要:

快速射电暴(FRB)的起源,明亮的毫秒射电瞬变,仍然是一个谜。几个理论模型预期FRB伴随着光学余辉(例如,Totani 2013; Kashiyama等人2013)。为了研究FRB的起源,我们使用斯巴鲁/Hyper Suprime-Cam在发现FRB~151230(估计的$z \lesssim 0.8$)后~天在$8$、$11$和$14$进行了$gri$波段跟踪观测。后续观测达到了点源$26.5$ ~mag的$50\%$完整性量级,这是迄今为止FRB最深的光学随访。我们发现$13$对应的候选人在观察过程中的变异性。我们调查他们的属性与光谱和多波长观测和档案目录。两个候选者被排除在外的FRB~151230在其他无线电馈电喇叭,同时运行的检测,以及光度红移和FRB~151230的色散测量之间的不一致性的检测。另外八个候选者与活动星系核中看到的光学变化一致。另外两个候选者与瞬态模板(IIn型超新星)很好地拟合,最后一个候选者与我们所有的瞬态模板拟合得很差,并且位于扩展源的偏离中心。它只能通过具有微弱峰值和快速下降的快速瞬变重现,偶然重合的概率为$\sim3.6\%$。我们还发现没有一个候选星系与Ia型超新星一致,这排除了Ia型超新星与FRB~151230在$z\leq0.6$的关联,并将主星系的色散度量限制在$\lesssim300$ ~pc~cm $^{-3}$。

英文摘要:

The origin of fast radio bursts (FRBs), bright millisecond radio transients, is still somewhat of a mystery. Several theoretical models expect that the FRB accompanies an optical afterglow (e.g., Totani 2013; Kashiyama et al. 2013). In order to investigate the origin of FRBs, we perform $gri$-band follow-up observations of FRB~151230 (estimated $z \lesssim 0.8$) with Subaru/Hyper Suprime-Cam at $8$, $11$, and $14$~days after discovery. The follow-up observation reaches a $50\%$ completeness magnitude of $26.5$~mag for point sources, which is the deepest optical follow-up of FRBs to date. We find $13$ counterpart candidates with variabilities during the observation. We investigate their properties with multicolor and multi-wavelength observations and archival catalogs. Two candidates are excluded by the non-detection of FRB~151230 in the other radio feed horns that operated simultaneously to the detection, as well as the inconsistency between the photometric redshift and that derived from the dispersion measure of FRB~151230. Eight further candidates are consistent with optical variability seen in AGNs. Two more candidates are well fitted with transient templates (Type IIn supernovae), and the final candidate is poorly fitted with all of our transient templates and is located off-center of an extended source. It can only be reproduced with rapid transients with a faint peak and rapid decline and the probability of chance coincidence is $\sim3.6\%$. We also find that none of our candidates are consistent with Type Ia supernovae, which rules out the association of Type Ia supernovae to FRB~151230 at $z\leq0.6$ and limits the dispersion measure of the host galaxy to $\lesssim300$~pc~cm$^{-3}$ in a Type Ia supernova scenario.

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