arXiv 0908.21112009-08-14astro-ph.GAastro-ph.COastro-ph.SR

我们能从明亮的河外行星状星云的运动学中了解到什么

What can we learn about the kinematics of bright extragalactic planetary nebulae

M. G. Richer, S. -H. Baez, J. A. Lopez, H. Riesgo, Ma. T. Garcia-Diaz

备注：: accepted for publication in the october 2009 issue of Revista Mexicana de Astronomia y Astrofisica

摘要：

我们提出了高分辨率光谱的[ \ion{O}{3} ] $λ$ 5007和H $α$线的明亮的行星状星云在银河系凸起和矮星系M32，天炉座，人马座，和NGC 6822在国家天文台在圣佩德罗马蒂尔山脉使用曼彻斯特Echelle摄谱仪获得。我们利用银河系膨胀行星状星云的高信噪比（S/N）观测，探索在中等信噪比下观测[ \ion{O}{3} ] $λ$ 5007线上的河外行星状星云时，可以可靠地确定哪些运动学信息。我们发现在[ \ion{O}{3} ] $λ$ 5007和H $α$中测量的本征线宽非常相似。在本示例中可用的S/N范围内，我们测量的线宽与S/N无关。最后，与高斯线形的偏差很小。因此，明亮的河外行星状星云中[ \ion{O}{3} ] $λ$ 5007谱线的线宽应该反映了电离星云壳层中大部分物质的运动学。

英文摘要：

We present high resolution spectroscopy in the [\ion{O}{3}]$λ$5007 and H$α$ lines of bright planetary nebulae in the Milky Way bulge and the dwarf galaxies M32, Fornax, Sagittarius, and NGC 6822 obtained at the Observatorio Astronomico Nacional in the Sierra San Pedro Martir using the Manchester Echelle Spectrograph. We use the high signal-to-noise (S/N) observations of Milky Way bulge planetary nebulae to explore what kinematic information can be determined reliably when observing extragalactic planetary nebulae in the [\ion{O}{3}]$λ$5007 line at modest S/N. We find that the intrinsic line widths measured in [\ion{O}{3}]$λ$5007 and H$α$ are very similar. Over the range of S/N available in this sample, the line width we measure is independent of the S/N. Finally, deviations from a Gaussian line shape are small. Thus, the line width of the [\ion{O}{3}]$λ$5007 line in bright extragalactic planetary nebulae should reflect the kinematics of most of the mass in the ionized nebular shell.

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英文摘要：

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