Identification of PAHs with HerschelquestionMark

One of the key issues in astrochemistry is the identification of polycyclic aromatic hydrocarbons (PAHs). Herschel is a powerful tool to identify gasphase interstellar PAHs, since these species have bands in the farIR that are much more specific than the midIR ones. The Red Rectangle is the best object to search for these bands and we have obtained deep spectra with SPIRE and PACS. The PACS spectrum shows evidence of structures, which could be PAH bands. However, we were unfortunate to use high density sampling over shortrange scans, and this results in pointing noise in the spectrum giving structures that are comparable to PAH features. We are asking for new PACS observations of the Red Rectangle using range spectroscopy with Nyquist sampling and 5 repetitions. Using this new data we will be able to reanalyze our high S/N data and determine which structures in the spectra are real astronomical signal and which are instrumental. With our optimized strategy, this observation requires 3.7 hours. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]