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- W1754746727 abstract "In this thesis, I present molecular line & continuum data of a sample of small, southern,isolated cores. I present a multi-wavelength view of the cores, by utilising opticalimages, 2MASS extinction maps, CO integrated intensity maps and 1.2mm continuumimages of each of the cores. Spitzer data are used to identify young stellar objects localto each core, which may influence the evolution of the core.Column densities and masses are calculated for each core. The column densitiescalculated from the CO and 1.2mm continuum tracers are shown to be in excellentagreement with each other, and with the peak extinction, as seen on the 2MASS extinctionmaps. A comparison of column density derived from 1.2mm continuum and C18Oobservations suggest that a fraction of the gas has frozen out onto the dust grains in thedensest parts of the core.The masses derived from 13CO, C18O and 1.2mm continuum observations are comparedwith the virial mass calculated from the observed linewidths. The cores are foundto be within 3� of virial equilibrium in all cases, which suggests that all cores may begravitationally bound.I find that the observed linewidths of the isolated cores are consistent with models ofstar formation by turbulent dissipation. The C18O linewidth is observed to be narrowerthan the 13CO linewidth, which is narrower than the 12CO linewidth in all cases. Thissuggests that as the density of the tracer increases, the linewidth decreases. Therefore,turbulent support against collapse is removed from the inside out, resulting in starsforming in the densest parts of the cores.I also present a proposed evolutionary diagram, based on the observed 12CO andratio of 12CO/C18O linewidths. I hypothesise that a young core will have large 12COand C18O linewidths. In an older core, the turbulence will have had time to dissipatein the core centre, and so the C18O linewidth will be narrower. For the oldest cores,the dissipation of turbulence will have occurred in the outer parts of the core and so the12CO/C18O ratio will be small, indicating a more evolved core." @default.
- W1754746727 created "2016-06-24" @default.
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- W1754746727 date "2013-01-01" @default.
- W1754746727 modified "2023-09-26" @default.
- W1754746727 title "Lonely cores : molecular line observations of isolated star formation" @default.
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