U/LIRGs合并过程中激波引起的合成谱
Composite Spectra in Merging U/LIRGs Caused by Shocks
摘要：
我们提出了一个关键的结果，从我们的光学积分场光谱调查的27个附近的超亮和亮红外星系（U/LIRG）从大天文台全天LIRG调查。使用空间分辨的多组分发射线拟合跟踪的发射线比和速度色散的电离气体，我们量化的第一次广泛的冲击电离在气体丰富的合并U/LIRGs。我们的研究结果表明，总观测到的\Ha通量从辐射冲击增加百分之几，在早期合并阶段的观测到的光发射线通量的60%以上，在后期合并的分数贡献。我们比较我们的解决光谱的核光谱，发现我们的样本中的3/4的星系，将被归类为“复合”的基础上光学光谱的主要特点是恒星形成和合并驱动的冲击相结合。我们的研究结果具有重要意义的解释“复合”的休息帧光谱的U/LIRGs的星暴+活动星系核，作为冲击辐射与恒星形成相结合，可以模仿“复合”的光谱在没有任何贡献的活动星系核。
英文摘要：
We present a key result from our optical integral field spectroscopic survey of 27 nearby ultra luminous and luminous infrared galaxies (U/LIRGs) from the Great Observatory All-sky LIRG Survey. Using spatially resolved multi-component emission line fitting to trace the emission line ratios and velocity dispersion of the ionized gas, we quantify for the first time the widespread shock ionization in gas-rich merging U/LIRGs. Our results show a fractional contribution to the total observed \Ha flux from radiative shocks increasing from a few percent during early merger stages to upwards of 60% of the observed optical emission line flux in late stage mergers. We compare our resolved spectroscopy to nuclear spectra and find that 3/4 of the galaxies in our sample that would be classified as "composite" based on optical spectroscopy are primarily characterized by a combination of star formation and merger-driven shocks. Our results have important implications for the interpretation of "composite" rest-frame optical spectra of U/LIRGs as starburst+AGN, as the shock emission combined with star formation can mimic "composite" optical spectra in the absence of any contribution from an AGN.
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