Since the arrival of millimeter wave interferometers and their subsequent advancement, the resolution of observations has improved significantly. However, the effects of these improvements have not...Show moreSince the arrival of millimeter wave interferometers and their subsequent advancement, the resolution of observations has improved significantly. However, the effects of these improvements have not yet been investigated. This research examines the effect of improving resolutions to SubMillimeter Galaxies (SMGs) like simulated Gaussian sources. To achieve this, simulated 350 GHz ALMA observations with 20 different antenna configurations with resolutions ranging from 0.05 to 1.1 arcsec of simulated Gaussian sources performed with CASA are used. For resolutions better than 0.2 arcsec, depending on the SNR, the flux and size from observations obtained with an image plane analysis, where the size is found using CASA, can be significantly lower than the true flux and size, due to the largest angular scale of the observations. Fitting a circular Gaussian to the uv-plane data demonstrates that the $uv$-plane analysis more accurately recovers the true FWHM than the image plane analysis using CASA. However, the major and minor axes of an elliptical source are not recovered and the size of an elliptical source is overestimated with the uv-plane analysis. Different SMG companion fields from the ALESS and UDS survey originally observed by Hodge et al. (2013), Simpson et al. (2015) and Wardlow et al. (2018) and quasar fields with a companion detected by Decarli et al. (2017) were simulated with circular Gaussian sources to examine the influence of companion sources to the FWHM of the main source acquired with the $uv$-plane analysis. Generally, the companions in the companion fields examined do not show an influence on the FWHM of the main source.Show less
Diffuse interstellar bands are broad absorption features detected in diffuse interstellar clouds, first discovered almost a century ago. The carriers of these bands have not yet been identified, it...Show moreDiffuse interstellar bands are broad absorption features detected in diffuse interstellar clouds, first discovered almost a century ago. The carriers of these bands have not yet been identified, it is suspected that they are carbon chain radicals or polycyclic aromatic hydrocarbons. This thesis reports on laboratory spectra of C6H, the hexatriynyl radical, and their analysis. It concerns two vibronic bands of the B2Pi-X2Pi electronic transition, the Omega = 3/2 component of the origin band and an unidentified band, for both 12C6H and 13C6H. Molecular parameters for the origin band components and the centres of the unidentified bands' Q branches are determined. All four features are compared to catalogues of known diffuse interstellar bands, none of them matches.Show less
