NGC 3359中径向反方向梯度断裂的重新检查
Reexamination of the Radial Abundance Gradient Break in NGC 3359
摘要：
在这方面的贡献，我们重新审视径向氧丰度梯度的强棒旋星系NGC 3359，其中，使用成像分光光度技术，马丁和罗伊检测到附近的有效半径的星系的一个突破。我们有新的发射线通量测量的HII区域的NGC 3359从光谱获得的斯巴鲁望远镜进一步调查这一说法。我们发现，有小的系统变化，从窄带成像确定的线比相比，我们的光谱测量。我们推导出并应用校正线比率发现马丁和罗伊和统计检查的有效性，提出了NGC 3359使用最近开发的金属丰度诊断的梯度突破。我们发现，在高置信度下，一个有断裂的模型比一个没有断裂的模型更好地拟合数据，这表明在螺旋星系中存在一个强棒可以产生可测量的金属径向分布的变化。
英文摘要：
In this contribution, we reexamine the radial oxygen abundance gradient in the strongly barred spiral galaxy NGC 3359, for which, using an imaging spectrophotometric technique, Martin & Roy detected a break near the effective radius of the galaxy. We have new emission line flux measurements of HII regions in NGC 3359 from spectra obtained with the Subaru telescope to further investigate this claim. We find that there are small systematic variations in the line ratios determined from narrow-band imaging as compared to our spectroscopic measurements. We derive and apply a correction to the line ratios found by Martin & Roy and statistically examine the validity of the gradient break proposed for NGC 3359 using recently developed metallicity diagnostics. We find that, with a high degree of confidence, a model with a break fits the data significantly better than one without it. This suggests that the presence of a strong bar in spiral galaxies can generate measurable changes in the radial distribution of metals.
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