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A sensitive broadband molecular line survey of the Sagittarius B2(N)star-forming region has been obtained with the HIFI instrument on the HerschelSpace Observatory, offering the first high-spectral resolution look at thiswell-studied source in a wavelength region largely inaccessible from the ground(625-157 um). From the roughly 8,000 spectral features in the survey, a totalof 72 isotopologues arising from 44 different molecules have been identified,ranging from light hydrides to complex organics, and arising from a variety ofenvironments from cold and diffuse to hot and dense gas. We present an LTEmodel to the spectral signatures of each molecule, constraining the sourcesizes for hot core species with complementary SMA interferometric observations,and assuming that molecules with related functional group composition arecospatial. For each molecule, a single model is given to fit all of theemission and absorption features of that species across the entire 480-1910 GHzspectral range, accounting for multiple temperature and velocity componentswhen needed to describe the spectrum. As with other HIFI surveys toward massivestar forming regions, methanol is found to contribute more integrated lineintensity to the spectrum than any other species. We discuss the molecularabundances derived for the hot core, where the local thermodynamic equilibriumapproximation is generally found to describe the spectrum well, in comparisonto abundances derived for the same molecules in the Orion KL region from asimilar HIFI survey.

Herschel observations of EXtraordinary Sources: Analysis of the full Herschel/HIFI molecular line survey of Sagittarius B2(N)