Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567155
Title: Observations of high mass star formation using BLAST and Herschel
Author: Harry, Sarah
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 2011
Availability of Full Text:
Access through EThOS:
Access through Institution:
Abstract:
In this thesis, I present BLAST observations of the Carina Nebula and Herschel observations of NGC7538. I use the source extracting routine CSAR to identify 172 source in Carina and 94 sources in NGC7538. I fit SEDs to all the sources and calculate their mass, luminosity, temperature and radius. For the Carina Nebula I find a mass range of 20 – 10 4M¯, a luminosity range of 10 2 – 10 5 L¯, a temperature range of 16 – 28 K, and source radii range of 0.3 – 3.2 pc. For NGC7538 I find a mass range of 5 – 10 3M¯, a luminosity range of 5 – 10 3 L¯, a temperature range of 10 – 40K and a source radii range of 0.1 – 2 pc. I cross - check the source extraction method using the routine, GETSOURCES. This algorithm found a total of 621 sources in NGC7538. The GETSOURCES catalogue is filtered to removed sources which are present in two or less wavelengths. This filtered catalogue then has a good correlation with the CSAR catalogue. Using both catalogues a robust source list of 75 sources is created from sources found by both routines. I plot the mass against radius for both the Carin Nebula and NGC7538. For Carina the data are best fitted by M / R1.8 which is comparable to the Larson relation of M / R2. In NGC7538 I find no relation. I find no temperature dependence in the Carina Nebula with any other source property but find a weak relation between temperature and luminosity in NGC7538. Both regions show a relation of L / M. I find a relation between radius and Luminosity per unit volume where smaller sources have a higher luminosity per unit volume and the larger sources have a lower value. I find sources with a luminosity per unit volume less then 1L¯pc−3 tend to lie in the less dense regions of the nebulae and sources with a luminosity per unit volume greater then 3.5L¯pc−3 lie in the denser regions where the more evolved sources tend to be. This could show that the luminosity per unit volume can trace the evolutionary status of sources in a region.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.567155  DOI: Not available
Keywords: QB Astronomy
Share: