|Identification of PAHs with Herschel?
|One of the key issues in astrochemistry is the identification of polycyclic aromatic hydrocarbons (PAHs). Herschel is a powerful tool to identify gas-phase interstellar PAHs, since these species have bands in the far-IR that are much more specific than the mid-IR 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 short-range 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.
|THROES: a caTalogue of HeRschel Observations of Evolved Stars. I. PACS range spectroscopy . Ramos-Medina J. et al. . Astronomy & Astrophysics, Volume 611, id.A41, 38 pp. . 611 . 10.1051/0004-6361/201731940 . 2018A&A...611A..41R ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, DDT_cjoblin_3, SPG v14.2.0. https://doi.org/10.5270/esa-polrrx6