High-J CO observations with HIFI of low-to high-mass star-forming regions

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Universiteit Leiden, Faculty of Science, Leiden Observatory, Hollanda

Tezin Onay Tarihi: 2010

Tezin Dili: İngilizce

Öğrenci: Irene San Jose Garcia

Asıl Danışman (Eş Danışmanlı Tezler İçin): Ewine Van Dishoeck

Eş Danışman: Umut Yıldız

Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu

Özet:

Throughout this thesis, high–J CO observations performed by the HIFI spectrometer have been analyzed for a varied sample of 43 young stellar objects. These sources represent a wide range of luminosity and mass values, being able to trace and compare, for the first time, the characteristics and properties of the CO and some isotopologues emission lines across the entire mass spectrum. Using just the present ground–based telescopes, the observations of these high transitions are impossible. However, thanks to the Herschel Space Observatory, the sub–millimetre window is now accessible and the science behind it can be discovered. Therefore, one of the goals of this thesis is to

start exploring that window in order to achieve a deeper understanding of the star–forming regions, places where complicate physical and chemical processes are carried out. For this reason, a preliminary study among the different types of YSOs was performed through their spectra, trying to find a link from the low– to the high–mass sources by comparing their main observable characteristics.