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arXiv 2104.09727astro-ph.HE
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快速射电暴的约束亮光学对应物

Constraining bright optical counterparts of Fast Radio Bursts

C. Nuñez, N. Tejos, G. Pignata, C. D. Kilpatrick, J. X. Prochaska, K. E. Heintz, K. W. Bannister, S. Bhandari, C. K. Day, A. T. Deller, C. Flynn, E. K. Mahony, … 展开作者

C. Nuñez, N. Tejos, G. Pignata, C. D. Kilpatrick, J. X. Prochaska, K. E. Heintz, K. W. Bannister, S. Bhandari, C. K. Day, A. T. Deller, C. Flynn, E. K. Mahony, D. Majewski, L. Marnoch, H. Qiu, S. D. Ryder, R. M. Shannon

摘要:

快速射电暴(FRB)是一种能量极高的脉冲,持续时间为毫秒,起源不明。为了理解发射这些脉冲的现象,已经对多波长对应物(包括光学对应物)进行了有针对性和无针对性的搜索。这项工作的目的是寻找光学瞬变的位置8以及本地化的FRB,在不同的时间尺度上(通常在一天,几个月,一年后FRB检测)的突发到达后,以比较与已知的瞬态光学光变曲线。我们使用了拉斯坎布雷斯天文台全球望远镜网络(LCOGT),由于其在世界各地工作的23台望远镜网络,我们可以迅速拍摄图像。我们使用模板减法技术对我们在不同时期收集的所有图像进行处理。我们将减法分为两组,在一组中,我们使用最后一个时期的图像作为模板,在另一组中,我们使用第一个时期的图像作为模板。我们已经在模板减去图像中的FRB(<1 arcsec)的局部化处搜索了明亮的光学瞬态。我们没有发现光学瞬变,所以我们设置了光学对应物的极限幅度。在我们的LCOGT数据中,典型的视(绝对)星等极限星等在r波段为~22(-19)等。我们已经比较了我们的极限星等与超亮超新星(SLSNe),Ia型超新星(SNe),超新星与伽马射线暴(GRB SNe),一个kilonova,和潮汐破裂事件(TDEs)的光变曲线。我们排除了FRB与SLSN相关的可能性,置信度约为99.9%。我们也可以在相似的置信度下排除Ia型SNe、GRB SNe和TDE(在某些条件下)的最亮子类型,尽管我们不能排除FRB与这些瞬态类别中的每一个的最暗子类型相关联的情况。

英文摘要:

Fast Radio Bursts (FRBs) are extremely energetic pulses of millisecond duration and unknown origin. In order to understand the phenomenon that emits these pulses, targeted and untargeted searches have been performed for multi-wavelength counterparts, including the optical. The objective of this work is to search for optical transients at the position of 8 well-localized FRBs, after the arrival of the burst on different time-scales (typically at one day, several months, and one year after FRB detection) in order to compare with known transient optical light curves. We used the Las Cumbres Observatory Global Telescope Network (LCOGT), which allows us to promptly take images owing to its network of twenty-three telescopes working around the world. We used a template subtraction technique on all the images we collected at different epochs. We have divided the subtractions into two groups, in one group we use the image of the last epoch as a template and in the other group we use the image of the first epoch as a template. We have searched for bright optical transients at the localizations of the FRBs (<1 arcsec) in the template subtracted images. We have found no optical transients, so we have set limiting magnitudes of optical counterparts. Typical limiting magnitudes in apparent (absolute) magnitudes for our LCOGT data are ~22 (-19) mag in the r-band. We have compared our limiting magnitudes with light curves of superluminous supernovae (SLSNe), type Ia supernovae (SNe), supernovae associated with gamma-ray bursts (GRB SNe), a kilonova, and tidal disruption events (TDEs). We rule out that FRBs are associated with SLSN at a confidence of ~99.9%. We can also rule out the brightest sub-types of type Ia SNe, GRB SNe and TDEs (under some conditions) at similar confidence, though we cannot exclude scenarios where FRBs are associated with the faintest sub-type of each of these transient classes.

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