旋转射电瞬变的近红外观测
Near-infrared observations of Rotating Radio Transients
摘要：
我们报告的第一个近红外观测获得的旋转无线电瞬变（RRAT）。使用安装在ESO甚大望远镜（VLT）上的自适应光学装置，我们观察到了这类天体中的两个：RRAT J1819-1458和RRAT J1317-5759。2006年和2008年在J、H和Ks波段进行了这些观测。我们没有发现RRAT J1317-5759的候选红外对应物，其极限星等为Ks ~ 21。另一方面，我们发现了RRAT J1819-1458的可能候选对应物，其星等为Ks=20.96+/-0.10。特别是，这是在源的准确X射线位置周围的1 sigma误差圆内的唯一源，尽管考虑到拥挤的场，我们不能排除这是由于偶然的巧合。高磁性RRAT J1819-1458的红外通量比正常射电脉冲星的预期要高，但与磁星一致。我们还搜索了最近在RRAT J1819-1458周围发现的X射线扩散发射的近红外对应物，但我们没有在近红外波段检测到这种成分。我们讨论了RRAT J1819-1458的假定对应物的光度，并与迄今为止在该波段探测到的所有孤立中子星（5颗中子星和7颗磁星）的近红外辐射进行了比较。
英文摘要：
We report on the first near-infrared observations obtained for Rotating RAdio Transients (RRATs). Using adaptive optics devices mounted on the ESO Very Large Telescope (VLT), we observed two objects of this class: RRAT J1819-1458, and RRAT J1317-5759. These observations have been performed in 2006 and 2008, in the J, H and Ks bands. We found no candidate infrared counterpart to RRAT J1317-5759, down to a limiting magnitude of Ks ~ 21. On the other hand, we found a possible candidate counterpart for RRAT J1819-1458, having a magnitude of Ks=20.96+/-0.10 . In particular, this is the only source within a 1 sigma error circle around the source's accurate X-ray position, although given the crowded field we cannot exclude that this is due to a chance coincidence. The infrared flux of the putative counterpart to the highly magnetic RRAT J1819-1458, is higher than expected from a normal radio pulsar, but consistent with that seen from magnetars. We also searched for the near-infrared counterpart to the X-ray diffuse emission recently discovered around RRAT J1819-1458, but we did not detect this component in the near-infrared band. We discuss the luminosity of the putative counterpart to RRAT J1819-1458, in comparison with the near-infrared emission of all isolated neutron stars detected to date in this band (5 pulsars and 7 magnetars).
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