Nitrogen abundances in the amorphous galaxy NGC 5253
Nitrogen abundances in the amorphous galaxy NGC 5253
复制标题
非晶态星系 NGC 5253 中的氮丰度
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
J. Roy
中科院分区：
文献类型：
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作者：
J. Walsh;J. Roy
利用英澳望远镜的成像光谱系统，用RGO摄谱仪的狭缝扫描了无定形星系NGC 5253的中心电离气体复合体。对应于几个星云线的单色图像获得的空间分辨率为2.3 × 1.3平方角秒（1像素）。非常高的信噪比的光谱允许的电子温度的测量超过78个像素使用线比禁用O III（4959+5007）/4363，因此丰富的O，N，He和Ne。高值的log N/O的区域被发现对应于一个集群的沃尔夫-拉叶星的存在。天然气综合体的其他区域显示这种类型的对象的对数N/O的正常不足，并且没有检测到Wolf-Rayet特征。log N/O与log O/H之间存在一种正相关关系，这种趋势与任何现有的低金属丰度星系中氮起源的核合成方案都不一致。41篇参考文献。
The central complex of ionized gas in the amorphous galaxy NGC 5253 was scanned with the slit of the RGO spectrograph using the imaging spectroscopy system of the Anglo-Australian Telescope. Monochromatic images corresponding to several nebular lines were obtained with a spatial resolution of 2.3 x 1.3 sq arcsec (1 pixel). The very high signal-to-noise ratio of the spectra allowed the measurements of the electron temperature over 78 pixels using the line ratio forbidden O III (4959+5007)/4363 and hence abundances of O, N, He, and Ne. A region of high values of log N/O was found to correspond with the presence of a cluster of Wolf-Rayet stars. Other areas of the gas complex show the normal deficiency in log N/O for this type of object, and no Wolf-Rayet feature is detected. There is an anticorrelation between log N/O versus log O/H, a trend which is not clearly consistent with any existing nucleosynthesis scenario for the origin of nitrogen in low metallicity galaxies. 41 references.