Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"massive star formation"”.
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Massive Star Formation at High Spatial Resolution
This thesis studies the early phases of massive stars and their impact on the surrounding. The capabilities of continuum radiative transfer (RT) codes to interpret the observations are also investigated. The main results of this work are: 1) Two massive star-forming regions are observed in the …
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Early Stages of Massive Star Formation at High Spatial Resolution
Massive star formation takes place under harsh observational conditions; as time passes, the already formed stars produce an ionised region and dissipate the surrounding molecular cloud, becoming accessible in the NIR. For this reason one of the earliest phases to observationally study massive …
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Understanding star formation at early stages in the filamentary era
This thesis presents a study of star formation at early stages in the filamentary era with a special focus on massive star and cluster formation. We first investigate the importance of filamentary structures in star formation and propose an observationally driven scenario for the evolution of …
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Interferometric studies of 3 millimeter continuum and molecular lines in the giant molecular cloud Sagittarius B2
… known for its active role in chemical evolution, massive star formation, and complex kinematic structure. Studies of the 3 mm continuum and the transitions of various molecular species are essential in understanding not only the chemical evolution but also the physical and kinematic structure of …
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The interstellar medium and star formation in edge-on galaxies
… a study of the vertical disk structure and star formation in four edge-on spiral galaxies (NGC 891, 4157, 4565, and 5907) observed in CO with BIMA/CARMA, HI with VLA, and IR (3.6 and 24 µm) with Spitzer. We first derive the radial density distributions for the edge-on galaxies using our PVD …
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A multi-molecular line study of an entire giant molecular cloud
A unified theory of star formation remains one of the major unsolved issues in astrophysics. Presented here are the results of multi-molecular lines mapping of the entire giant molecular cloud G333, comprised sites of low- and high-mass star forming regions in various evolution stages of star …
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Testing and improving the luminosity relations for Gamma-Ray Bursts
… construction of the Hubble Diagram and measuring massive star formation rate. The greatest disadvantage of using GRBs as standard candles is that their accuracy is lower than desired. With the recent advent of GRBs as a new standard candle, every effort must be made to test and improve the …
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The Evolution of Massive Young Stellar Objects in the Large Magellanic Cloud
… largest catalog to date of infrared spectra of massive young stellar objects in the Large Magellanic Cloud. Evidenced by their very different spectral features, the luminous objects span a range of evolutionary states from those most embedded in their natal molecular material to those that have …
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Mapping the interstellar magnetic field: Observations of the Goldreich-Kylafis effect towards late-type evolved stars and star-forming regions
… magnetic fields in both late-type evolved stars and star-forming regions. Observations of linearly polarized molecular line transitions arising from the Goldreich-Kylafis (G-K) effect provide valuable insight into the magnetic field geometry in these sources. Through observing with CARMA, …
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The impact of star cluster environments on planet formation
It is thought that most stars, including our Sun, form within clusters alongside many other stars. Planet formation and star formation occur simultaneously, and therefore the birth environment of stars will shape the formation of planets. Properties of the present day Solar System hint to a past in …