2010A&A...521L..29C

Previous studies by the satellites SWAS and Odin provided stringent upper limits on the gas phase water abundance of dark clouds (x(H₂O)<7x10^–9). We investigate the chemistry of water vapor in starless cores beyond the previous upper limits using the highly improved angular resolution and sensitivity of Herschel and measure the abundance of water vapor during evolutionary stages just preceding star formation. High spectral resolution observations of the fundamental ortho water (o-H₂O) transition (557GHz) were carried out with the Heterodyne Instrument for the Far Infrared onboard Herschel toward two starless cores: Barnard 68 (hereafter B68), a Bok globule, and LDN 1544 (L1544), a prestellar core embedded in the Taurus molecular cloud complex. Detailed radiative transfer and chemical codes were used to analyze the data. The RMS in the brightness temperature measured for the B68 and L1544 spectra is 2.0 and 2.2mK, respectively, in a velocity bin of 0.59km/s. The continuum level is 3.5±0.2mK in B68 and 11.4±0.4mK in L1544. No significant feature is detected in B68 and the 3σ upper limit is consistent with a column density of o-H₂O N(o-H₂O)<2.5x10¹³cm^–2, or a fractional abundance x(o-H₂O)<1.3x10^–9, more than an order of magnitude lower than the SWAS upper limit on this source. The L1544 spectrum shows an absorption feature at a 5σ level from which we obtain the first value of the o-H₂O column density ever measured in dark clouds: N(o-H₂O)=(8±4)x10¹²cm^–2. The corresponding fractional abundance is x(o-H₂O)≃5x10^–9 at radii >7000AU and ≃2x10^–10 toward the center. The radiative transfer analysis shows that this is consistent with a x(o-H₂O) profile peaking at ≃10^–8, 0.1pc away from the core center, where both freeze-out and photodissociation are negligible. Herschel has provided the first measurement of water vapor in dark regions. Column densities of o-H₂O are low, but prestellar cores such as L1544 (with their high central densities, strong continuum, and large envelopes) appear to be very promising tools to finally shed light on the solid/vapor balance of water in molecular clouds and oxygen chemistry in the earliest stages of star formation.