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Starless dense cores eventually collapse dynamically, which forms protostarsinside them, and the physical properties of the cores determine the nature ofthe forming protostars. We report ALMA observations of dust continuum emissionand molecular rotational lines toward MC27 or L1521F, which is considered to bevery close to the first protostellar core phase. We found a few starlesshigh-density cores, one of which has a very high density of ~10^7 cm^-3, withina region of several hundred AU around a very low-luminosity protostar detectedby Spitzer. A very compact bipolar outflow with a dynamical timescale of a fewhundred years was found toward the protostar. The molecular line observationshows several cores with an arc-like structure, possibly due to the dynamicalgas interaction. These complex structures revealed in the present observationssuggest that the initial condition of star formation is highly dynamical innature, which is considered to be a key factor in understanding fundamentalissues of star formation such as the formation of multiple stars and the originof the initial mass function of stars.

ALMA observations of a high-density core in Taurus: dynamical gas interaction at the possible site of a multiple star formation