The data processing pipeline for the Herschel SPIRE Fourier Transform Spectrometer

摘要

We present the data processing pipeline to generate calibrated data products from the Spectral\udand Photometric Imaging Receiver (SPIRE) imaging Fourier Transform Spectrometer on the\udHerschel Space Observatory. The pipeline processes telemetry from SPIRE observations and\udproduces calibrated spectra for all resolution modes. The spectrometer pipeline shares some\udelements with the SPIRE photometer pipeline, including the conversion of telemetry packets\udinto data timelines and calculation of bolometer voltages.We present the following fundamental\udprocessing steps unique to the spectrometer: temporal and spatial interpolation of the scan\udmechanism and detector data to create interferograms; Fourier transformation; apodization;\udand creation of a data cube. We also describe the corrections for various instrumental effects\udincluding first- and second-level glitch identification and removal, correction of the effects\uddue to emission from the Herschel telescope and from within the spectrometer instrument,\udinterferogram baseline correction, temporal and spatial phase correction, non-linear response\udof the bolometers, and variation of instrument performance across the focal plane arrays.\udAstronomical calibration is based on combinations of observations of standard astronomical\udsources and regions of space known to contain minimal emission.