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 11 of 11 for “"Dust continuum"”.
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Circumstellar environments around the youngest protostars: interferometric observations and modeling
… In this thesis, both molecular lines and dust continuum are utilized to investigate the nature of the collapsing envelopes. In particular, I focus on the isolated edge-on low-mass protostar L1157. While a large-scale (~20,000 AU) flattened envelope is detected in both the N2H+ line and the …
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Mapping the interstellar magnetic field: Observations of the Goldreich-Kylafis effect towards late-type evolved stars and star-forming regions
… processes. In this dissertation, the observed dust continuum polarization mapping and G-K polarization mapping of the CO J = 1−0 transition are presented. The detected dust continuum polarization is at $m_{\ell,p}$ ∼ 1.52% with a fairly concentrated spatial structure and with an error-weighted …
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Observations of disks around the youngest protostars: Characterizing frequency, dust properties, and magnetic fields at the earliest times
… to examine regarding disk frequency, disk radii, dust populations, disk evolution, disk structure, and presence of planetesimals in the youngest protostellar disks. Through observational work with the CARMA, VLA, and ALMA telescope arrays towards some of the youngest protostars, this dissertation …
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No evidence for millimeter continuum source overdensities in the environments of z [greater than approximately] 6 quasars
… galaxy overdensities. We analyze 1.2mm ALMA dust continuum maps of 35 bright quasars at 6 < z < 7 and search the primary beam for excess continuum emission as evidence for early protoclusters. We compare the detection rates of continuum sources at [greater than or equal to] 5σ significance in …
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Probing planetary disks: from birth to protoplanets
… a large area of research, it is the gas and dust in these disks that will grow into planets. By the Class II phase of a protostar’s evolution, large disks are common (so there is a large mass reservoir available) and it is commonly assumed that most of the planet formation process occurs at …
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Mid-Infrared Studies of Galactic sources: Probing the Relationship Between Polycyclic Aromatic Hydrocarbons and their Physical Environment
… (FIR) cooling lines of atoms and the FIR dust continuum emission of a nearby reflection nebula in combination with PDR models to derive maps of the physical conditions. Comparing these derived physical conditions with PAH emission characteristics at a matching spatial resolution and …
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Understanding the Star -Forming Environment in Stellar Clusters
… observations probing dense molecular gas and dust continuum are presented. These observations are used to reveal the large-scale young stellar population around the vicinity where the sampled clusters form, probe the physical conditions of dense molecular clumps which are capable of forming …
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Spectroscopic studies of star-forming galaxies and the intergalactic medium in the early Universe
… enrichment in these systems. Constraints on the dust continuum of one source indicate the presence of a surprisingly cold and massive dust reservoir. Finally, I discuss directions for future work, in particular the synergy of existing observatories in combination with JWST, the much-anticipated …
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Study of fullerene-based molecular nanostructures in planetary nebulae
… residual C60 emission seen when subtracting the dust continuum emission might have several interpretations; the most interesting being that other fullerene-based species (e.g., fulleranes) may contribute to the observed 17.4 μm emission.
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
… as part of this work (§ 3) resulting in unique continuum maps ~10 deg<sup>2</sup> that detail extended diffuse emission of W3/W4/W5 at unprecedented sensitivity and angular resolution at low frequencies. Our final full bandwidth image (at ~ 53.5 MHz) reaches a final resolution of between ~ …
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Astronomical Interferometry at Submillimetre Wavelengths
… amplification is responsible for the emission. Continuum emission, spatially offset from the masers, was also detected with the interferometer, as was the CO (3-2) line. These data, particularly the offset continuum, are shown to be incompatible with single-star models for VY CMa. Instead, a …