TESS全帧图像中与FRB181228同时光学对应的搜索
A Search of TESS Full Frame Images for a Simultaneous Optical Counterpart to FRB181228
摘要：
FRB 181228是由莫隆格洛合成射电望远镜（MOST）在与凌日系外行星勘测卫星（TESS）观测相一致的位置和时间探测到的，代表了快速射电暴（FRB）的第一次同时多波长数据收集。TESS的大成像视场允许在MOST产生的不确定区域上进行搜索。然而，21”的TESS像素尺度和30分钟的全帧图像（FFI）节奏对于具有可能的毫秒持续时间的FOB的检测不是最佳的。我们搜索TESS FFI，并没有发现具有限制TESS幅度为16的事件，假设事件持续时间为30分钟，对应于约2000 Jy的光通量密度上限为~ms的信号持续时间，假设没有信号丢失。此外，TESS的宇宙射线缓解方法显着降低了其对短时间尺度瞬变的敏感性，我们对其进行了量化。我们将我们的结果与Yang，Zhang和Wei（2019）的预测进行了比较，发现上限比预测的最大光通量密度高出2000倍。然而，我们发现，如果FRB 181228发生在被认为是迄今为止最近的FRB检测（37 Mpc）的星系中，那么FOB可能已经被TESS检测到。在不久的将来，当CHIME和ASKAP将检测到数百到数千个FRB时，TESS可能能够从这些罕见的明亮和附近的FRB中检测到FOB（如果可以实现更复杂的宇宙射线切除）。
英文摘要：
FRB181228 was detected by the Molonglo Synthesis Radio Telescope (MOST) at a position and time coincident with Transiting Exoplanet Survey Satellite (TESS) observations, representing the first simultaneous multi-wavelength data collection for a Fast Radio Burst (FRB). The large imaged field-of-view of TESS allows a search over the uncertainty region produced by MOST. However, the TESS pixel scale of 21" and the Full Frame Image (FFI) cadence of 30 minutes is not optimal for the detection of an FOB with a possible millisecond duration. We search the TESS FFIs and find no events with a limiting TESS magnitude of 16, assuming a 30 minute event duration, corresponding to an optical flux density upper limit of approximately 2000 Jy for a ~ms signal duration, assuming no signal loss. In addition, the cosmic ray mitigation method for TESS significantly reduces its sensitivity to short timescale transients, which we quantify. We compare our results to the predictions of Yang, Zhang, and Wei (2019) and find that the upper limit is a factor of two thousand higher than the predicted maximum optical flux density. However, we find that if FRB181228 had occurred in the galaxy thought to host the nearest FRB detection to date (37 Mpc), an FOB may have been detectable by TESS. In the near future, when CHIME and ASKAP will detect hundreds to thousands of FRBs, TESS may be able to detect FOBs from those rare bright and nearby FRBs within this large population (if more sophisticated cosmic ray excision can be implemented).
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