WIYN Imaging of Extraplanar Dust in the Edge-On Spiral NGC 891
WIYN Imaging of Extraplanar Dust in the Edge-On Spiral NGC 891
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DOI：
10.1086/118660
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发表时间：
1997-05
期刊：
影响因子：
3.7
通讯作者：
J. Howk;B. Savage
中科院分区：
文献类型：
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作者：
J. Howk;B. Savage
我们提出了高分辨率（10^21 cm^-2），假设银河气体与尘埃关系，质量估计超过 2x10^5 - 5x10^6 太阳质量。考虑到观测到的高度和导出的质量，各个尘埃结构的重力势能在 20-200x10^51 ergs 范围内。对位面外尘埃特征的粗略计数表明， NGC 891 中与面外尘埃相关的高 z 气体可能超过 2x10^8 太阳质量，或银河系中性 ISM 总质量的约 2%，我们讨论了可能产生高 z 尘埃结构的机制，例如此处显示的图像中的那些。 目前尚不清楚这些机制中的哪一个主要负责我们图像中看到的广泛的面外尘埃结构。 （摘要删节）
We present high-resolution ( 10^21 cm^-2, with masses estimated to be more than 2x10^5 - 5x10^6 solar masses, assuming Galactic gas-to-dust relationships. The gravitational potential energies of the individual dust structures, given their observed heights and derived masses, lie in the range of 20-200x10^51 ergs. Rough number counts of extraplanar dust features suggest the mass of high-z gas associated with extraplanar dust in NGC 891 likely exceeds 2x10^8 solar masses, or ~2% of the total neutral ISM mass of the galaxy. We discuss several mechanisms which may produce high-z dust structures such as those seen in the images presented here. It is not yet known which of these mechanisms are primarily responsible for the extensive extraplanar dust structures seen in our images. The data presented are part of a larger program to search for and characterize off-plane dust structures in edge-on systems. (Abstract Abridged)