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We present a study of the sulfur-bearing species detected in a lineconfusion-limited survey towards Orion KL performed with the IRAM 30m telescopein the range 80-281 GHz. The study is part of an analysis of the line surveydivided into families of molecules. Our aim is to derive accurate physicalconditions and molecular abundances in the different components of Orion KLfrom observed SO and SO2 lines. First we assumed LTE conditions obtainrotational temperatures. We then used a radiative transfer model, assumingeither LVG or LTE excitation to derive column densities of these molecules inthe different components of Orion KL. We have detected 68 lines of SO, 34SO,33SO, and S18O and 653 lines of SO2, 34SO2, 33SO2, SO18O and SO2 v2=1. Weprovide column densities for all of them and also upper limits for the columndensities of S17O, 36SO, 34S18O, SO17O and 34SO2 v2=1 and for severalundetected sulfur-bearing species. In addition, we present 2'x2' maps aroundOrion IRc2 of SO2 transitions with energies from 19 to 131 K and also maps withfour transitions of SO, 34SO and 34SO2. We observe an elongation of the gasalong the NE-SW direction. An unexpected emission peak appears at 20.5 km/s inmost lines of SO and SO2. A study of the spatial distribution of this emissionfeature shows that it is a new component ~5" in diameter, which lies ~4" westof IRc2. We suggest the emission from this feature is related to shocksassociated to the BN object. The highest column densities for SO and SO2 arefound in the high-velocity plateau (a region dominated by shocks) and in thehot core. These values are up to three orders of magnitude higher than theresults for the ridge components. We also find high column densities for theirisotopologues in both components. Therefore, we conclude that SO and SO2 aregood tracers, not only of regions affected by shocks, but also of regions withwarm dense gas.

A line confusion-limited millimeter survey of Orion KL. III. Sulfur oxide species