Observations of water vapor toward Orion BN/KL

We have obtained spectra of the rotational ground-state 1(10)-1(01) 556.936 GHz ortho-(H2O)-O-16 and 1(10)-1(01) 547.676 GHz ortho-(H2O)-O-18 transitions toward Orion BN/KL using the Submillimeter Wave Astronomy Satellite (SWAS). The ortho-(H2O)-O-16 spectrum shows strong evidence for both a broad (Delta v similar or equal to 48 km s(-1)) and a narrow (Delta v similar or equal to 7.5 km s(-1)) component, while the ortho-(H2O)-O-18 shows evidence for only a broad (Delta v similar or equal to 24 km s(-1)) component. The broad component emission in both ortho-(H2O)-O-16 and ortho-(H2O)-O-18 arises primarily from gas heated within the low- and high-velocity outflows and shocked gas surrounding IRc2 in which the ortho-(H2O)-O-16 and ortho-(H2O)-O-18 fractional abundances are estimated to be 3.5 x 10(-4) and 7 x 10(-7), respectively. This finding provides further confirmation that water is efficiently and abundantly produced within warm shock-heated gas. We estimate that the hot core plus the compact ridge contribute less than or similar to 10% to the ortho-(H2O)-O-16 integrated intensity within the SWAS beam. The narrow component seen in the ortho-(H2O)-O-16 spectrum is best fitted by ortho-water emission from the extended ridge (ER) and the higher temperature core of the extended ridge (CER) with a common fractional abundance of 3.3 x 10(-8). The absence of any discernible narrow component in the ortho-(H2O)-O-18 spectrum is used to set 3 sigma upper limits on the ortho-water fractional abundance within the ER of 7 x 10(-8) and within the CER of 5.2 x 10(-7). This implies that within the dense extended quiescent region, gas-phase water is neither a major repository of oxygen nor a major coolant in Orion BN/KL.