IC 10中心的电离气体：Wolf-Rayet星可能的局部化学污染
The ionized gas at the center of IC 10: A possible localized chemical pollution by Wolf-Rayet stars
摘要：
我们目前的结果，从积分场光谱与波茨坦多孔径光谱仪在3.5米望远镜在卡拉阿尔托天文台的强烈的恒星形成区[HL 90] 111在中心的星爆星系IC 10。我们已经获得了不同发射线的空间采样为1”x 1”= 3.9 pc x 3.9 pc的地图，并分析了灭绝，物理条件，电离的性质和电离气体的化学丰度，以及确定当地最近的恒星形成事件的年龄。通过定义多个孔径，我们研究了[HL 90] 111内某些区域的主要积分性质。两个相邻的spaxels显示了明确的检测到广泛的He II 4686发射线，这一功能似乎是由一个单一的WNL星。我们还报告了一个可能的N和他丰富的精确spaxels WR功能检测。富集模式大致符合预期的一个单一的或非常少数的WR星的喷出物的污染。此外，这种化学污染是非常局部化的（~2”~7.8 pc），在局部体积之外的恒星形成星系中应该很难检测到。我们还讨论了使用最常见的经验校准估计的氧丰度的电离气体在附近的星系从二维光谱数据。当应用这些经验方法时，气体的电离度起着重要的作用，因为它们倾向于随着电离度的增加而给出较低的氧丰度。
英文摘要：
We present results from integral field spectroscopy with the Potsdam Multi-Aperture Spectrograph at the 3.5m telescope at Calar Alto Observatory of the intense star-forming region [HL90] 111 at the center of the starburst galaxy IC 10. We have obtained maps with a spatial sampling of 1" x 1" = 3.9 pc x 3.9 pc of different emission lines and analyzed the extinction, physical conditions, nature of the ionization, and chemical abundances of the ionized gas, as well determined locally the age of the most recent star-formation event. By defining several apertures, we study the main integrated properties of some regions within [HL90] 111. Two contiguous spaxels show an unambiguous detection of the broad He II 4686 emission line, this feature seems to be produced by a single WNL star. We also report a probable N and He enrichment in the precise spaxels where the WR features are detected. The enrichment pattern is roughly consistent with that expected for the pollution of the ejecta of a single or a very small number of WR stars. Furthermore, this chemical pollution is very localized (~2"~7.8 pc) and it should be difficult to detect in star-forming galaxies beyond the Local Volume. We also discuss the use of the most-common empirical calibrations to estimate the oxygen abundances of the ionized gas in nearby galaxies from 2D spectroscopic data. The ionization degree of the gas plays an important role when applying these empirical methods, as they tend to give lower oxygen abundances with increasing ionization degree.
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