Molecular Clouds and Star Formation in the Magellanic System by NANTEN

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Magellanic System offers an ideal laboratory to study how the interstellar medium evolves and how stars are formed at the unrivalled closeness to us. In order to elucidate star formation in the Magellanic System, surveys of the molecular clouds were carried out by NANTEN. In this work, we compare the giant molecular clouds (GMCs) with young clusters and H II regions identified by optical or radio. We find that about 76 % of the GMCs are actively forming stars or clusters, while 24 % show no signs of massive star or cluster formation. Effects of supergiant shells (SGSs) on the formation of GMCs and stars are also studied. The number and surface mass densities of the GMCs are higher by a factor of 1.5-2 at the edge of the SGSs than elsewhere. It is also found that young stellar clusters are more actively formed in the GMCs facing to the center of the SGSs. These results are consistent with the previous studies by Yamaguchi et al. and suggest the formation of the GMCs and the cluster is triggered by dynamical effects of the SGSs. We will also present a result from a comparison of the GMCs with YSO candidates from SAGE.

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