Abstract
Abstract Results of recent studies of dense interstellar molecular clouds are discussed. Observations in molecular lines excited at high densities revealed dense cores in many clouds with gas densities n ∼ (0.3 ÷ 3) × 105 cm−9, kinetic temperatures Tk ∼ 10 ÷ 100 K, masses (0.3 ÷ 104) M⊙. The cores are close to the virial equilibrium. There are correlations between velocity dispersion and size, between mass and size and some others similar to those found for less dense clouds but with different coefficients. Implicit indications of fragmentary structure on 40’ scales are obtained.
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