Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.742010
Title: Formation of stars and stellar clusters in galactic environment
Author: Smilgys, Romas
ISNI:       0000 0004 7225 8705
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2018
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Abstract:
Star and stellar cluster formation in spiral galaxies is one of the biggest questions of astrophysics. In this thesis, I study how star formation, and the formation of stellar clusters, proceeds using SPH simulations. These simulations model a region of 400 pc and 107 solar masses. Star formation is modelled through the use of sink particles which represent small groups of stars. Star formation occurs in high density regions, created by galactic spiral arm passage. The spiral shock compresses the gas and generates high density regions. Once these regions attain sufficiently high density, self-gravity becomes dominant and drives collapse and star formation. The regions fragment hierarchically, forming local small groups of stars. These fall together to form clusters, which grow through subsequent mergers and large scale gas infall. As the individual star formation occurs over large distances before forming a stellar cluster, this process can result in significant age spreads of 1-2 Myrs. One protocluster is found to fail to merge due to the large scale tidal forces from the nearby regions, and instead expands forming a dispersed population of young stars such as an OB association.
Supervisor: Bonnell, Ian Alexander Sponsor: European Research Council (ERC)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.742010  DOI: Not available
Keywords: Star formation ; Formation of stellar clusters ; OB associations ; SPH simulations ; Molecular clouds ; Galactic spiral arms ; QB806.S6 ; Stars--Formation ; Stars--Clusters ; Spiral galaxies
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