Interstellar Scattering Disks

Gwinn博士将继续使用甚长基线干涉测量法（VLBI）研究星际散射。这些研究探讨了造成星际散射的密度波动，特别是它们的空间光谱，以及散射源的结构。他将：(i)进一步研究羟基脉泽在源W49N中的散射；研究船帆座脉冲星的散射；（三）利用散射盘作为透镜，尝试在纳弧秒尺度上解析船帆座脉冲星的发射区域；（iv）观察脉冲星低频变异性强的散射；评估散射对毫秒脉冲星1937-214天文测量观测的影响。脉冲星的观测将利用VLBI进行快照或散斑散射。

Dr. Gwinn will continue studies of interstellar scattering with very long baseline interferometry (VLBI). These studies probe the density fluctuations responsible for interstellar scattering, particularly their spatial spectrum, and the structures of the scattered sources. He will: (i) Further study scattering of Hydroxyl masers in the source W49N; (ii) Study scattering of the Vela pulsar; (iii) Attempt to resolve the emission region of the Vela pulsar at nanoarcsecond scales, using the scattering disk as a lens; (iv) Observe scattering from pulsars showing strong low frequency variability; and (v) Assess the effects of scattering on astrometric observations of the millisecond pulsar 1937-214. Observations of pulsars will make use of VLBI in the snapshot, or speckle, regime of scattering.