Molecular Cores and Young Clusters of Star Forming Regions

Details Molecular Cores and Young Clusters of Star Forming Regions Molecular Cores and Young Clusters of Star Forming Regions

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010acasn..51..357y&link_type=abstract

Acta Astronomica Sinica, vol. 51, no. 4, p. 357-373

Other

Ism: Clouds, Stars: Formation, Ism: Lines And Bands, Stars: Pre-Main Sequence

Scientific paper

Data of (J=1-0) lines of 12CO, 13CO and C18O were taken simultaneously by using 13.7 m millimeter telescope of Qinghai station of Purple Mountain Observatory at Delingha. We map 17 star forming regions which are associated with the clusters. All but IRAS 04547+4753 show C18O emission, 13 regions where 13CO integrated intensities reach the half maximums are fully mapped, while some cores of the other four regions may be missed because of the wide extension of the molecular clouds. Based on the data, some physical properties have been derived, such as the full width at half maximum (FWHM) of three lines, excitation temperature and optical depth. The column density, local thermodynamic equilibrium mass (MLTE) and virial mass (Mvir) have also been obtained. The average ratios of Mvir to MLTE for 13CO and C18O cores are 0.66 and 0.74, respectively, suggesting these cores are close to virial equilibrium. The maps of integrated intensities of 13CO and C18O are overlaid on the 2MASS K band images to compare the cores with clusters in morphology. We also calculate the sizes and masses of clusters from the photometric results of point sources released by 2MASS database. Based on the result, the star formation efficiency (SFE) of clouds associated with young clusters is calculated. SFE varies over a wide range, from 10% to 30%.

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