邻近镓II的空间分辨化学。Maffei 2的核酒吧
Spatially Resolved Chemistry in Nearby Galaxies II. The Nuclear Bar in Maffei 2
摘要：
我们提出了2”-10”成像的11个过渡从9个分子物种在马菲2核酒吧。这些数据是用BIMA和OVRO干涉仪获得的。十个检测到的过渡与现有的CO同位素，HCN，CS和毫米连续谱数据进行比较。绘制的物种之间的显着的空间变化，观察整个核酒吧。进行主成分分析，以表征转换，恒星形成和分子柱密度之间的相关性。分析表明，HCN，HNC，HCO+和3 mm连续谱紧密相关，表明与大质量恒星形成有直接联系。我们发现两个主要的形态不同的化学基团，CH 3OH，SiO和HNCO组成的粮食化学分子，与HCN，HNC，HCO+和C2 H，分子强的恒星形成的存在。谷物化学分子HNCO、CH 3OH和SiO追踪流体动力棒冲击。HNCO/CH_3OH、SiO/CH_3OH和SiO/HNCO比值的近似恒定性表明，整个核的激波性质是均匀的。HCN/HCO+、HCN/HNC、HCN/CS和HCN/CO比率主要由密度的变化来解释。高的HCO+/N2 H+比值与C2 H线相关，这表明该比值可能是一个强大的新的致密光子主导区（PDR）探测外星系。C2 H显示沿短轴的分子流出。外流的形态学和运动学与外流年龄6-7百万年一致。
英文摘要：
We present 2" - 10" imaging of eleven transitions from nine molecular species across the nuclear bar in Maffei 2. The data were obtained with the BIMA and OVRO interferometers. The ten detected transitions are compared with existing CO isotopologues, HCN, CS and millimeter continuum data. Dramatic spatial variations among the mapped species are observed across the nuclear bar. A principle component analysis is performed to characterize correlations between the transitions, star formation and molecular column density. The analysis reveals that HCN, HNC, HCO+ and 3 mm continuum are tightly correlated, indicating a direct connection to massive star formation. We find two main morphologically distinct chemical groups, CH3OH, SiO and HNCO comprising the grain chemistry molecules, versus HCN, HNC, HCO+ and C2H, molecules strong in the presence of star formation. The grain chemistry molecules, HNCO, CH3OH and SiO, trace hydrodynamical bar shocks. The near constancy of the HNCO/CH3OH, SiO/CH3OH and SiO/HNCO ratios argue that shock properties are uniform across the nucleus. HCN/HCO+, HCN/HNC, HCN/CS and HCN/CO ratios are explained primarily by variations in density. High HCO+/N2H+ ratios are correlated with the C2H line, suggesting that this ratio may be a powerful new dense photon-dominated region (PDR) probe in external galaxies. C2H reveals a molecular outflow along the minor axis. The morphology and kinematics of the outflow are consistent with an outflow age of 6-7 Myrs.
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