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Observations of the isolated globule B335 with ALMA have yielded absorptionfeatures against the continuum that are redshifted from the systemic velocityin both HCN and HCO$^+$ lines. These features provide unambiguous evidence forinfall toward a central luminosity source. Previously developed models ofinside-out collapse can match the observed line profiles of HCN and HCO$^+$averaged over the central 50 AU. At the new distance of 100 pc, the inferredinfall radius is 0.012 pc, the mass infall rate is $3 \times 10^{-6}$ solarmasses per year, the age is 50,000 years, and the accumulated mass in thecentral zone is 0.15 solar masses, most of which must be in the star or inparts of a disk that are opaque at 0.8 mm. The continuum detection indicates anoptically thin mass (gas and dust) of only $7.5\times 10^{-4}$ solar masses inthe central region, consistent with only a very small disk mass.

Detection of Infall in the Protostar B335 with ALMA