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Title: A submillimetre survey of clustered low-mass star formation
Author: Curtis, E. I.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2009
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This thesis presents a new survey of the kinematics of clustered, low-mass star formation. The survey uses HARP, a new submillimetre heterodyne array at the James Clerk Maxwell Telescope (JCMT), to map the J = 3 → 2 rotational transitions of CO and its isotopologues 13CO and C18O across 630 sq. arcmin of the Perseus molecular cloud, in four regions: NGC1333, IC348, L1448 and L1455. An algorithm to account for variable calibration across the array is developed, which can be used to remove prominent artefacts in HARP data towards molecular clouds. A new catalogue of 850μm SCUBA clumps is identified using two automated algorithms, c1find and GaussClumps. The clumps found are gravitationally bound with a mass distribution comparable to the stellar initial mass function. However, many previously reported properties heavily depend on the algorithm used to identify the clumps’ emission. The C18O J = 3 → 2 linewidths of these clumps are supersonic, varying according to the clump age and environment and are smaller than predicted currently by gravoturbulent models. Localized velocity gradients are identified across many of the SCUBA clumps, which I interpret as signs of core rotation. The resultant angular monument distribution is consistent with the smallest momenta previously observed in similar studies. Clumps of C18O and 13CO gas are also identified using c1find, additional clumps with no continuum counterparts are not bound, but do obey Larson’s laws.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available