Limits on refractive interstellar scattering toward sagittarius B2
Limits on refractive interstellar scattering toward sagittarius B2
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人马座 B2 折射星际散射的限制
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
M. Schneps
中科院分区：
文献类型：
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作者：
C. Gwinn;J. Moran;M. Reid;M. Schneps
在本文中，一个上限是放置在星际等离子体的密度波动的光谱指数比较表观脉泽大小，由于小尺度波动，与徘徊在位置的脉泽约恒速路径，由于折射的大尺度波动。Sgr B2（N）中H/sub 2/O脉泽斑的散射像的直径约为300微弧秒（FWHM），与等速运动的偏离小于18微弧秒。这两个测量限制可能的幂律谱的密度波动指数小于或约3.67的柯尔莫哥洛夫值;或者，光谱可能有一个长波长截止在约10至13厘米。27篇参考文献。
In this paper, an upper limit is placed on the spectral index of density fluctuations in the interstellar plasma by comparing apparent maser sizes, due to small-scale fluctuations, with wander in position of masers about constant-velocity paths, due to refraction by large-scale fluctuations. The scattered images of H/sub 2/O maser spots in Sgr B2(N) are about 300 microarcseconds in diameter (FWHM), while their deviation from constant-velocity motion is less than 18 microarcseconds. These two measurements constrain possible power-law spectra of the density fluctuations to indices less than or about the Kolmogorov value of 3.67; alternatively, the spectrum may have a long-wavelength cutoff at about 10 to the 13th cm. 27 references.