论文标题
NGC 922中的金属性和X射线光度变化
Metallicity and X-ray luminosity variations in NGC 922
论文作者
论文摘要
我们介绍了基于长期光谱观测值的碰撞环NGC 922中金属性变化的系统研究。我们发现凸起和环中的恒星形成区域之间存在金属差异，金属度范围从几乎太阳能到显着的亚微极（$ \ rm {[[12+ \ log \ log（o/h）] \ sim 8.2} $）。我们检测到凸起的$ \ rm he \，_ i $排放，戒指形成区域，表明与最近（$ <10 $ Myr）恒星形成相关的巨大恒星电离，这与在所有研究区域中非常年轻的恒星群落的存在一致。我们发现NGC 922的X射线亮度和金属性的X射线光度与金属性之间存在抗相关性。不同的区域具有相似的恒星种群年龄，使金属性是抗可相关的主要驱动力。 NGC 922中不同区域对金属性的X射线发射的依赖性与对星系的综合X射线输出的类似研究以及X射线二元种群模型的预测。
We present a systematic study of the metallicity variations within the collisional ring galaxy NGC 922 based on long-slit optical spectroscopic observations. We find a metallicity difference between star-forming regions in the bulge and the ring, with metallicities ranging from almost solar to significantly sub-solar ($\rm{[12+\log(O/H)]\sim 8.2}$). We detect $\rm He\,_I$ emission in the bulge and the ring star-forming regions indicating ionization from massive stars associated with recent ($<10$ Myr) star-formation, in agreement with the presence of very young star-clusters in all studied regions. We find an anti-correlation between the X-ray luminosity and metallicity of the sub-galactic regions of NGC 922. The different regions have similar stellar population ages leaving metallicity as the main driver of the anti-correlation. The dependence of the X-ray emission of the different regions in NGC 922 on metallicity is in agreement with similar studies of the integrated X-ray output of galaxies and predictions from X-ray binary population models.
