PAPAS: determine the actual SFR in red spirals falling into clusters

并不是所有星系团中的红色星系都是红色的和死亡的。在不松弛的星团中--如处女座--也存在红色螺旋，显示正在形成的恒星因尘埃而变红。我们的目的是要找出尘埃红色螺旋星系是否是进入星系团势能过程中的普通场星系，或者它们的恒星形成是否是由穿越星系团间介质的冲压压力触发的。在我们研究得最好的星系团Abell 901/2中，从H和UV+FIR通量确定SFR导致了相互矛盾的结果。Panic Paschen Alpha Survey(PAPAS)被提出用来检查几个中间红移星系团中的H基SFR，方法是利用红移到K波段的Paschen线。目前的提案应通过重复由于2016年上半年恶劣天气而丢失的观测来完成A226/8的观测。

Not all red galaxies in clusters are red and dead. In unrelaxed clusters - like Virgo – also red spirals exist that show ongoing star formation, reddened by dust. We aim to find out whether the dusty red spirals are common field galaxies in the process of entering the cluster potential or whether their star formation is triggered by ram pressure from moving across the inter-cluster medium. In our best studied cluster, Abell 901/2 the determination of the SFR from H and the UV+FIR flux leads to conflicting results. The PAnic Paschen Alpha Survey (PAPAS) is proposed to check the H-based SFR in several intermediate redshift galaxy clusters by using the Paschen-line red-shifted into the K-band. The current proposal should complete the observations of A226/8 by repeating observations lost due to bad weather in H2016.