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的和死的。在不松弛的星团中——比如室女座——也存在红色的螺旋，表明恒星正在形成，被尘埃染红。为了了解星团中的星系群，我们很有兴趣弄清楚这些尘埃红色螺旋星系是在进入星团势能的过程中共同形成的星系，还是它们的恒星形成是由星团间介质移动产生的公羊压力触发的。在我们研究的最好的簇Abell 901/2中，由Hα和UV+FIR通量测定的SFR导致了相互矛盾的结果，这可能表明SF历史，但也可能是由于Hα通量的错误校正造成的。Paschen α巡天计划（PAPAS）将利用Paschen α线红移到k波段来检测中红移星系团中h α基SFR。此提案旨在弥补F2016数据的不足。

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. To understand the galaxy population in clusters it is intriguing 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 Hα and the UV+FIR flux leads to conflicting results that might indicate SF history, but could also be caused by badly corrected extinction of the Hα flux. The PAnic Paschen Alpha Survey (PAPAS) will check the Hα-based SFR in intermediate-redshift galaxy clusters by using the Paschen-α line red-shifted into the K-band. This proposal aims to complete the insufficient F2016 data.