捕获猝灭镓：WISE红外过渡区的性质
Catching Quenching Galaxies: The Nature of the WISE Infrared Transition Zone
摘要：
我们提出了一个显着的分歧早型星系和晚型星系之间的发现，在[4.6]-[12]微米的颜色从宽视场红外巡天探测器（WISE）。然后，我们使用发射线诊断比较样本来探索在WISE红外过渡区（IRTZ）内和边缘附近发现的物体的性质。我们推测，这种分叉可能是由于热尘埃和PAH的排放功能在晚型星系的存在。使用通过冲击后星爆星系巡天（SPOGS）选择的星系样本，我们能够识别具有强巴耳末吸收（EW（Hdelta）>5埃）的星系，以及位于光学绿谷内的与恒星形成不一致的发射线（被认为是SPOG候选者，或SPOG *）。西弗特和低电离核发射线区域，其u-r颜色倾向于红色，在IRTZ内有很强的代表性，而SPOG * 倾向于位于恒星形成边缘附近。虽然活动星系核在IRTZ中有很好的代表性，但我们认为，IRTZ中占主导地位的星系群是处于过渡到光学绿谷的后期阶段的星系，它们的残余星际介质正在脱落。
英文摘要：
We present the discovery of a prominent bifurcation between early-type galaxies and late-type galaxies, in [4.6]-[12] micron colors from the Wide Field Infrared Survey Explorer (WISE). We then use an emission-line diagnostic comparison sample to explore the nature of objects found both within, and near the edges of, this WISE infrared transition zone (IRTZ). We hypothesize that this birfurcation might be due to the presence of hot dust and PAH emission features in late-type galaxies. Using a sample of galaxies selected through the Shocked Poststarburst Galaxy Survey (SPOGS), we are able to identify galaxies with strong Balmer absorption (EW(Hdelta)>5 Angstroms) as well as emission lines inconsistent with star formation (deemed SPOG candidates, or SPOGs*) that lie within the optical green valley. Seyferts and low ionization nuclear emission line regions, whose u-r colors tend to be red, are strongly represented within the IRTZ, whereas SPOGs* tend to sit near the star-forming edge. Although AGN are well-represented in the IRTZ, we argue that the dominant IRTZ population are galaxies that are in late stages of transitioning across the optical green valley, shedding the last of their remnant interstellar media.
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