Galactic massive star forming regions near and far [Elektronische Ressource] : a (sub)millimeter study of the Orion Molecular Cloud 1 and W49A / Tzu-Cheng Peng

Galactic massive star forming regions near and far: a (sub)millimeterstudy of the Orion Molecular Cloud 1 and W49ADissertationzurErlangung des Doktorgrades (Dr. rer. nat.)derMathematisch-Naturwissenschaftlichen Fakulta¨tderRheinischen Friedrich-Wilhelms-Universita¨t Bonnvorgelegt vonPeng, Tzu-ChengausTaiwanBonn (Mai, 2010)AngefertigtmitGenehmigungderMathematisch-NaturwissenschaftlichenFakult¨atderRheinischen Friedrich-Wilhelms-Universit¨at BonnDiese Dissertation ist auf dem Hochschulschriftenserver der ULB Bonnhttp://hss.ulb.uni-bonn.de/diss onlineelektronish publiziert. Das Erscheinungsjahr ist 2010.1. Referent: Prof. Dr. K. M. Menten2. Referent: Prof. Dr. P. KroupaTag der Promotion : 03.09.2010iiAbstractMassive stars play an important role in shaping the structure of galaxies due to thelarge energy output during their lifetime. However, because of the short evolutionarytime scales, the large extinction toward their birth places, and the large distanceof massive stars, our understanding of their formation is still sketchy. Hence, theobservations oftwo well-known massive star formingregions in our Galaxy (W49Aat11.4 kpc and Orion Molecular Cloud 1 at 414 pc) were carried out using the IRAM30 m and APEX telescopes, including large-scale mappings of various molecular line+emission, such as CO isotopologues, HCN, HCO , and SiO.