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arXiv 1206.0863astro-ph.GA
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NGC 5253超星云中的[S IV ]:高分辨率电离气体动能图

[S IV] in the NGC 5253 Supernebula: Ionized Gas Kinematics at High Resolution

Sara C. Beck, John H. Lacy, Jean L. Turner, Andrew Kruger, Matt Richter, Lucian P. Crosthwaite

摘要:

附近的矮恒星爆发星系NGC 5253拥有一个深深嵌入的无线电红外超星云,由数千颗O星激发。我们用IRTF上的高分辨谱仪TEXES在S+3的10.5μm谱线上以3.8kms ~(-1)的光谱分辨率和1.4”的空间分辨率观测到了这个源。线轮廓不能很好地拟合由一个单一的高斯。最佳的简单拟合用两个高斯函数来描述气体,一个接近银河系速度,半高宽为33.6 km s-1,另一个强度相似,半高宽为94 km s-1,中心距蓝方\sim 20 km s-1。这提出了一个超星云的模型,其中气体从分子云中流向我们,就像“气泡”或“香槟流”或朱(2006)模拟的HII区域。

英文摘要:

The nearby dwarf starburst galaxy NGC 5253 hosts a deeply embedded radio-infrared supernebula excited by thousands of O stars. We have observed this source in the 10.5μm line of S+3 at 3.8 kms-1 spectral and 1.4" spatial resolution, using the high resolution spectrometer TEXES on the IRTF. The line profile cannot be fit well by a single Gaussian. The best simple fit describes the gas with two Gaussians, one near the galactic velocity with FWHM 33.6 km s-1 and another of similiar strength and FWHM 94 km s-1 centered \sim20 km s-1 to the blue. This suggests a model for the supernebula in which gas flows towards us out of the molecular cloud, as in a "blister" or "champagne flow" or in the HII regions modelled by Zhu (2006).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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