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The ESA Herschel Spectral and Photometric Imaging Receiver (SPIRE) FourierTransform Spectrometer (FTS) Spectral Feature Finder (FF) project is anautomated spectral feature fitting routine developed within the SPIREinstrument team to extract all prominent spectral features from all publiclyavailable SPIRE FTS observations. In this work, we demonstrate the use of theFF information extracted from three observations of the edge-on spiral galaxyNGC 891 to measure the rotation of NII and CI gas at Far-infrared frequenciesin complement to radio observations of the HI 21cm line and the CO(1-0)transition as well as optical measurements of Halpha. We find that measurementsof both NII and CI gas follow a similar velocity profile to that of HI andHalpha showing a correlation between neutral and ionized regions of theinterstellar medium (ISM) in the disk of NGC 891.

The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder V. Rotational measurements of NGC 891