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We search for evidence of a relation between properties of young stellarobjects (YSOs) and their parent molecular clouds to understand the initialconditions of high-mass star formation. A sample of 135 sources was selectedfrom the Infrared Astronomical Satellite (IRAS) Point Source Catalog, on thebasis of their red color to enhance the possibility of discovering youngsources. Using the Kolner Observatorium fur SubMillimeter Astronomie (KOSMA)3-m telescope, a single-point survey in 13CO(2-1) was carried out for theentire sample, and 14 sources were mapped further. Archival mid-infrared (MIR)data were compared with the 13CO emissions to identify evolutionary stages ofthe sources. A 13CO observed sample was assembled to investigate thecorrelation between 13CO line width of the clouds and the luminosity of theassociated YSOs. We identified 98 sources suitable for star formation analysesfor which relevant parameters were calculated. We detected 18 cores from 14mapped sources, which were identified with eight pre-UC HII regions and one UCHII region, two high-mass cores earlier than pre-UC HII phase, four possiblestar forming clusters, and three sourceless cores. By compiling a large (360sources) 13CO observed sample, a good correlation was found between the 13COline width of the clouds and the bolometric luminosity of the associated YSOs,which can be fitted as a power law: lg(dV13/km/s)=-0.023+0.135lg(Lbol/Lsolar).Results show that luminous (>10^3Lsolar) YSOs tend to be associated with bothmore massive and more turbulent (dV13>2km/s) molecular cloud structures.

The relation between 13CO(2-1) line width in molecular clouds and bolometric luminosity of associated IRAS sources