A Very Dense Low-Mass Molecular Condensation in Taurus: Evidence for the Moment of Protostellar Core Formation

Astronomy and Astrophysics – Astronomy

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Interstellar: Clouds, Interstellar: Molecules, Line Profiles, Stars: Formation

Scientific paper

We present evidence for a protostellar condensation that is very close to the moment of the formation of a protostellar core within a time scale of ~ 104 yr. This starless condensation, named MC 27 in complete surveyed molecular condensations in Taurus, is ~ 0.1 pc in size and ~ 3 MO in mass. It exhibits fairly strong and narrow H^{{13}} CO^{+} emission of the J = 4--3, 3--2, and 1--0 transitions, as well as self-reversed profiles of HCO^{+} J = 4--3 and 3--2. MC 27 has a density of ~ 106 cm^{{-3}} within ~ 1000 AU at the center, which is the highest value among the ~ 40 starless condensations in Taurus. MC 27 shows a sharply peaked density distribution; the molecular intensity is well fitted by a power-law density distribution of r^{{ ~ } -2} over 0.02 pc

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