[VMF2000] Sc 30 , the SIMBAD biblio

More than 110 dense condensations of the dark clouds in Lupus, Corona Australis, Norma, Vela, and Scorpius were observed in the ¹³CO and C¹⁸O (J=1-0) transitions. The condensations of dark clouds with high star formation activity like the Ophiuchus, Taurus, and Cepheus have average C¹⁸O and H₂ column densities of 1.8x10¹⁵ and 1.1x10²² cm^–2. If we take the average size of the condensations to be 0.2 pc, a condensation must have average H₂ volumetric densities ≥2x10⁴ cm^–3 in order to be a good candidate to form stars. The four Lupus filaments have similar radial velocities and velocity dispersions, suggesting that they originated from the same parental cloud. Among these filaments, Lupus 1 is unique in having recent star formation activity, despite the high number of T Tauri stars observed toward the others. Lupus 1 also shows a complex velocity gradient along its main axis. The distribution of radial velocities of the condensations observed toward Scorpius are in good agreement with the hypothesis that they are in a region with expansion velocity smaller than or equal to 18 km.s^–1. The Corona Australis cloud has velocity gradients ranging from -0.5 km.s^–1.pc^–1 at one extreme to 0.1 km.s^–1.pc^–1 at the other.