Interstellar Scattering Disks

星际散射盘

• 批准号: 9217784
• 负责人: Carl Gwinn
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217784&HistoricalAwards=false
• 关键词: Interstellar; Scattering; Disks

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.

Gwinn博士将继续用甚长基线干涉测量法（VLBI）研究星际散射。这些研究探测了导致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：（一）进一步研究W 49 N源中羟基脉泽的散射;（二）研究船帆座脉冲星的散射;（三）利用散射盘作为透镜，试图在纳弧秒尺度上分辨船帆座脉冲星的发射区;（四）观察显示出强烈低频可变性的船帆座脉冲星的散射;（v）评估散射对毫秒脉冲星1937-214天体测量观测的影响。天文卫星的观测将利用VLBI的快照，或斑点，散射制度。